INTRODUCTION PROCEDURES - Oregon State University

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BC0038-1 had a nice plant type, good vigor, and attractive tubers. Its maturity appears to be earlier than Russet Burbank. This entry, C08011-5, and AC77101- 1 ...

14 Statewide and Western Regional Potato Seedling Screening Trials at the Klamath Experiment Station K.A. Rykbost and J. Maxwelll

INTRODUCTION The Oregon Potato Variety Development Program presently screens approximately 80,000 first-generation seedlings. Survivors of the first two levels of selection at Hermiston, Powell Butte, or Ontario are advanced to replicated yield trials. The KES participates in the program from this point forward. In 1988 KES conducted five individual trials as part of the statewide variety selection program. The KES program was modified in 1988 to strengthen the total effort. For the first time a Western Regional Trial was conducted at KES. This trial is the final step in selection of advanced lines prior to official release. Entries are included from several states and trials are conducted at 10 to 12 locations in the western states. An experiment was conducted to determine whether alternative screening procedures would improve the efficiency of the selection process. Larger plot size and a greater volume of samples for grading were used in all trials to improve experimental precision.

PROCEDURES All variety screening trials were conducted in a randomized complete block design. Cultural practices and other conditions that varied between individual experiments will be discussed separately for each trial. All trial areas were fumigated with 15 gpa of Telone II applied on April 15. Herbicides included Eptam applied at 3.5 lb ai/A on June 7, and metribuzin applied aerially at 0.30 lb ai/A on July 5. Insect control practices included aldicarb banded with fertilizer at 3.0 lb ai/A at planting, methamidophos applied aerially at 0.75 lb ai/A in combination with Ridomil - MZ at 2.0 lb/A on July 22, and methamidophos applied aerially at 0.5 lb/A in combination with Duter at 20 oz/A on August 23. Vines were desiccated with diquat applied at 1.5 pints/A on September 6 and shredded with a rotobeater several days prior to harvest.

1 / Superintendent/Associate Professor, Experimental Biology Technician, respectively, Klamath Experiment Station.

Acknowledgements: Partial funding for variety development programs by the Oregon Potato Commission, the Cooperative State Research Service (USDA), the Agricultural Research Service, and Plant Genetics, Inc. is gratefully recognized.

15 Potatoes were planted with a two-row assisted feed planter using 32inch row spacing. All trials received 800 lb/A of 16-20-0-13 fertilizer banded on both sides of rows at planting. Seed was hand-cut to 1.5 to 2.0 ounce size, treated with thiophanate-methyl at 0.50 lb/cwt, and suberized for 10 to 14 days prior to planting. Trials received 1.7 inches of rainfall and 18.0 inches of irrigation water during the season. Irrigation was applied with solid-set sprinklers on a 40 foot x 48 foot spacing, twice weekly, to replenish 65-90 percent of pan evaporation, depending on growth stage. Potatoes were harvested with a one-row digger-bagger. Total weights of all tubers were determined in the field. Samples were tagged and stored until grading was done in October and November. Specific gravity was determined on a 10 pound sample of 6 to 10 ounce No. 1 grade tubers by the weight-in-air weight-in-water method. Internal defects were observed by cutting the 10 largest tubers in each sample. Yields of No. l's were not adjusted for surface blemishes such as scab or nematodes, or for internal defects such as hollow-heart or spraing (corky ring spot). Statistical analyses of data were performed with MSU Stat software. • RESULTS AND DISCUSSION

Preliminary Yield Trial Eighty-five numbered selections, three seed lots of Russet Burbank and four other named varieties were planted at 12-inch seed spacing on May 17. Three replications included one with 8 hills per entry and two with 12 hills per entry. Fertilizer applied at planting was supplemented with 100 lb N/A applied as solution 32 and incorporated with a rolling cultivator on June 7. Plots were harvested on September 27 and all tubers were saved for grading. Plant stands and canopy vigor were generally excellent and yields and tuber type were quite good. Nematode damage was fairly widespread in these and other KES trials. Root-knot nematode damage affected nearly all tubers in some plots. Spraing was observed in up to 40 percent of cut tubers. The 1988 season was favorable for nematodes of various species and control measures applied were less than satisfactory. Hollow-heart was also observed frequently but was generally confined to the oversize tubers. Russet Burbank performance was similar for the standard Powell Butte seedlot and nuclear seed (clone-39) from the Oregon Foundation Seed Project (Tables 1 and 2). A G-IV commercial seed source of Russet Burbank produced a 30 percent higher yield of No. l's in this trial. Yukon Gold was far superior to Yellow Finn. HiLite was not outstanding in yield but demonstrated nice appearance and a high percentage of No. 1 tubers. Several outstanding lines were identified in the trial. The best entry was A084180-1. Other promising selections included A084183-1, A084175-6, ND02904-1, and C0084206-2. All of these entries have been promoted to the

Statewide Trial for further evaluation in 1989.

16 Performance of selections at the four statewide locations was quite varied. Using only the ranking in total yield as a criterion, the best entry at KES (A084180-1) ranked 6, 11, and 41 at other sites. Ontario's top-yielder ranked 14, 87, and 21 at Hermiston; Powell Butte, and KES, respectively. This illustrates the importance of screening material at each location. Twenty-four of the entries were advanced to the Statewide Trial for 1989. They included 12 out of the top 20 in yield of No. l's at KES. It is interesting to note that Russet Norkotah was the male parent for 25 percent of the lines promoted and 20 percent of the lines entered in the trial. Oregon Statewide Trial A total of 55 entries were planted on May 18, including 43 numbered lines tested at all sites, and several advanced selections and named varieties evaluated only at KES. Thirty-hill plots at 12-inch seed spacing were replicated four times. Nitrogen, applied at 100 lb N/A as solution 32 on June 7, supplemented banded fertilizer. Plots were harvested on October 3. Approximately 50-pound samples were saved from each plot for grading and specific gravity determination. Crop performance was similar to that observed in the Preliminary Yield Trial. All Russet Burbank seed sources ranked very low in yield of No. l's (Table 3). The G-IV commercial source yielded less than Powell Butte or clone-1 sources in this trial. All Russet Burbank lots were considered rough and unattractive (Table 4). HiLite and Norgold yields were very similar to those observed in the Preliminary Yield Trial. Russet Norkotah was equivalent in yield to Norgold and slightly better than A7411-2 and A74114-4, both of which are being considered for release in the near future. A74212-1 was the outstanding entry in this trial at KES and at the other locations. Yield of No. l's was ranked in the top three for both clones at all four locations. Performance of this selection at KES over several years will be summarized later in this report. The screening line A081178-12 was an excellent lot at KES and ranked quite high at other locations. It is being retained in this trial for 1989. A083110-3, A083037-10, and A083119-3 performed well at KES and were promoted to the Tri-State Trial along with entry numbers 9, 16, 18, and 41. A081216-1 will advance to the Western Regional Trial, but ranked very low at KES. Statewide Chipping Five named varieties and five potential chipping selections were planted on May 18. Individual plots were one row, 30 feet long with seed spaced at 8.7 inches, replicated four times. Banded fertilizer was supplemented with 50 lb N/A as solution 32, applied on June 7. Plots were harvested on September 29. Approximately 60-pound samples were saved from each plot for grading and specific gravity determination. A 10-pound sub-

sample was delivered to Corvallis for evaluation of chip color.

17 Norchip has been the local standard for a small volume of chip stock grown for early fall delivery. Atlantic was superior to Norchip in yield, solids content,and color (Tables 5 and 6). Monona had higher yields than Atlantic but very low solids, a serious deficiency for chip processing. Kennebec produced high yields but had excessive size. BR7093-24 and ND2382-4 were the best numbered selections. BR7093-24 will be released by Idaho in 1989 under the tentative name of Gemchip. This selection and Atlantic appear to be promising candidates for a small but growing market for. Klamath Basin crops. BR7093-24 will be evaluated for response to cultural management practices in 1989. Western Regional Trial Entries, including seven named varieties and 13 numbered selections, were planted on May 19 in 30-hill plots at 12-inch seed spacing with four replications. An application of 100 lb N/A as solution 32 on June 7 supplemented banded fertilizer. The potatoes were desiccated with diquat on September 12 and harvested on September 28. Approximately 60tpound samples were saved for grading and specific gravity determination.

Russet Burbank benefitted from the additional length of growing season compared with Preliminary and Statewide Trials, achieving a higher yield in this trial (Table 7). The outstanding russeted selection was A74114-4, which is being considered for release by Idaho in 1990. This selection has maturity similar to Norgold (Table 8), excellent appearance, and would have achieved higher yields at a more appropriate planting density and fertilization rate. It will be evaluated for response to nitrogen rates and seed spacing in 1989. Red Lasoda produced an exceptionally high yield but had excessive size and poor appearance. NDTX9-1068-11R had good shape and skin color for a red, but experienced severe skinning damage in harvest, as did SH-1. The SH-1 selection from Plant Genetics, Inc., produced a significantly higher yield than its sister line, Shepody; however, it has very late vine maturity and is probably not suited to local climatic conditions. Sierra and Cal Gold are both of interest locally for seed production for the Bakersfield, California, area. Cal Gold produced a high yield of large tubers but also had fairly high percentages of No. 2's and culls. Sierra had very poor early season vigor which undoubtedly reduced yields. ND840-1 has excellent type and has demonstrated good storability; however, low yields and low solids combined with late maturity indicate that this seedling may not hold promise for the region. Out of ten selections entered for testing at all locations (A7816-4 through AC77226-13), only one demonstrated excellent appearance at KES. BC0038-1 had a nice plant type, good vigor, and attractive tubers. Its maturity appears to be earlier than Russet Burbank. This entry, C08011-5, and AC77101-1 have been selected for seed increase in Colorado and will remain in the trial. AC79100-1, AC80369-1, and AC77226-13 are being discarded. 'Washington will continue working with C008014-1, which has

graduated from this trial. The other entries will be retained for further evaluation.

18 This trial will be continued at KES if seed availability is sufficient. In the future an 8.7-inch seed spacing will be used and nitrogen fertilizer rates will be reduced by about 25 percent. This will enhance performance of most of the entries. New varieties from other North American breeding and selection programs that may be of interest locally will be included if possible.

Seedling Screening Procedure Trial Russet Burbank and five entries from the Oregon Statewide Trial were planted on May 18. Individual plots were two rows, 30 feet long with four replications. Seed spacing was 8.7 inches, and supplemental fertilizer was Vines were desiccated on applied at 50 lb. N/A as solution 32 on June 7. Plots were September 6, at the same time as the Oregon Statewide Trial. harvested on September 29. All tubers were saved and graded from both rows of each plot. The objective of this experiment was to determine whether larger plot and sample size, and different cultural management practices, would change the conclusions of potato selection screening trials. This trial used double the plot size, and four times greater sample size for grading than the Oregon Statewide Trial. Planting density was 40 percent greater and nitrogen rate was reduced by 50 lb N/A to more nearly represent cultural management requirements of varieties with lower tuber set and earlier maturity than Russet Burbank. In 1987 Preliminary and Statewide trials each of the five selections exceeded Russet Burbank yield of No. l's by over 50 percent, and had a relatively high percentage of 10 ounce tubers (Table 9). A083037-10 and A082616-18 exhibited poor shape in large tubers. This characteristic usually leads to discarding selections even though the Russet Burbank standard may show similar problems. The relative merits of the five selections varied between trials in 1988. A083010-7 produced a higher yield with better size distribution in the Oregon Statewide Trial at 12-inch spacing and a high nitrogen rate. A083019-10 and A083037-10 were similar in both trials except that the latter showed better type at the higher planting density and lower nitrogen rate. A083196-15 performed substantially better at higher density and a lower nitrogen rate. A082616-18 had similar yields under both management regimes, with slightly better size distribution at higher density and a lower nitrogen rate. Russet Burbank experienced a large increase in small tubers at the closer seed spacing. Experimental precision was improved slightly by increasing plot size and sample volume; however, differences were insufficient to justify the large increase in effort and cost associated with this change in procedures.

19

SUMMARY AND CONCLUSIONS Several outstanding selections were identified at each screening level in the Oregon and western regional programs. The majority of entries at early stages demonstrate higher yields than Russet Burbank, some by very large margins. Oregon's selection program includes a number of very attractive russeted selections which could become leading contenders to replace a portion of the Russet Burbank acreage in less than 10 years. In the short term A74212-1 appears to be a good selection for fresh market production in the Klamath Basin. The A74114-4 selection has excellent potential for an early fresh market russet. Preliminary tests suggest this seedling has better culinary quality than Russet Norkotah. BR7093-24 and Atlantic may find a place as chipping varieties in a local market that has considerable growth potential. Each of these lines need to be evaluated in more detail to determine their management requirements. Large differences in seedling performance between the four trial locations in Oregon emphasize the importance of conducting the trials at The Western Regional Trial is the only opportunity for local evalKES. uation of advanced lines from out-of-state programs. Including it in the KES program is highly desirable for the future. In past years the screening trials were conducted at KES using 15-hill plots and cultural practices considered optimum for Russet Burbank. In 1988 trials, 30-hill, or larger, plots improved experimental precision substantially. An increase in planting density and reduction in nitrogen rate will result in improved performance for most varieties and selections other than Russet Burbank. These changes will be incorporated in future screening trials beyond the Preliminary Yield Trial level.

20

Table 1. Tuber yield by grade for entries in the Preliminary Yield Trial, Klamath Experiment Station, 1988.

ENTRY NO. SELECTION

4-6 oz

6-10 oz cwt/A-

U.S. NO. 1'S >10 oz

B's

cwt/A

TOTAL RANK

%

No 2's -cwt/A

TOTAL cwt/A

YIELD RANK

Russet Burbank Yukon Gold Norgold HiLite NDO 2845-1

110 55 57 71 98

124 122 145 154 239

49 216 188 121 48

283 392 390 346 386

76 25 26 49 28

75 94 83 90 82

53 17 27 34 69

18 10 19 0 10

375 419 468 385 473

58 41 25 57 23

6. 7. 8. 9. 10.

NDO NDO NDO NDO NDO

2848-8 2863-6 2864-1 2871-1 2872-1

229 129 136 48 155

134 189 173 133 114

17 62 40 283 34

379 380 349 464 303

34 32 47 11 64

75 81 86 90 82

102 76 57 21 61

17 9 0 26 8

506 470 408 514 371

15 24 48 13 64

11. 12. 13. 14. 15.

NDO 2876-1 NDO 2876-3 Yellow fin NDO 2904-1 NDO 2904-6

146 169 119 74 75

137 62 96 133 116

40 0 0 300 278

323 232 214 507 469

57 85 89 4 10

80 73 48 89 93

55 88 88 25 18

10 0 91 27 10

406 319 447 567 507

49 84 31 4 14

16. 17. 18. 19. 20.

NDO NDO NDO NDO NDO

2904-7 2952-1 2962-7 2965-4 2971-1

70 96 110 152 110

157 77 135 133 145

161 4 98 3 154

387 177 343 289 409

27 90 50 71 21

93 69 82 74 86

25 55 31 95 39

0 17 15 0 22

415 257 417 389 473

44 91 43 56 21

21. 22. 23. 24. 25.

NDO NDO NDO NDO COO

2976-3 3003-3 3056-3 3057-2 84088-1

88 45 61 152 64

69 112 169 214 113

0 206 199 123 116

157 363 430 489 293

92 38 17 7 70

61 80 95 90 83

101 20 13 57 22

0 55 10 0 29

257 452 453 545 353

92 29 28

26. 27. 28. 29. 30.

COO COO COO COO COO

84115-1 84116-1 84159-4 84171-2 84171-3

111 187 88 78 57

152 141 166 159 123

117 26 60 122 103

329 354 298 360 283

54 45 66 41 77

89 81 88 86 96

42 78 17 34 12

0 2 13 24 0

371 435 337 418 296

63 36 77 42 87

31. 32. 33. 34. 35.

COO 84205-2 COO 84206-2 COO 64254-2 COO 84300-2 AO 84026-1

72 80 104 85 77

117 239 97 106 158

66 170 14 109 89

255 489 216 300 324

82 6 88 65 56

89 86 75 88 89

29 49 60 16 31

0 27 4 11 0

285 566 287 340 363

90 5 89 76 67

36. 37. 38. 39. 40.

AO AO AO AO AO

84040-1 84050-2 84060-8 84071-2 84107-1

121 98 113 96 44

224 214 166 153 137

69 41 91 68 230

413 353 370 317 410

19 46 35 60 20

86 87 86 88 93

61 54 51 34 27

0 1 5 9 0

479 408 432 361 441

20 47 38 69 33

41. 42. 43. 44. 45.

AO AO AO AO AO

84134-1 84136-2 84154-1 84154-2 84164-4

78. 94 61 97 170

173 138 171 127 188

120 65 115 170 38

370 297 347 394 396

36 67 48 24 23

89 89 82 75 81

20 35 30 30 87

12 0 34 3 4

414 333 423 522 489

45 79 40 12 19

46. 47. 48. 49.

AO AO AO AO

84168-1 84170-1 84172-2

85 162 120

178 233 140

230 67 27

494 462 286

5 12 75

92 87 78

25 60 65

3 0 7

84172-3

98

191

92

381

31

86

46

7

539 532 365 441

50.

AO 84172-4

173

9 10 66 34

116

7

295

68

74

83

0

398

52

1. 2. 3. 4. 5.

.

8

72

21

Table 1.(cont'd) Tuber yield by grade for entries in the Preliminary Yield Trial, Klamath Experiment Station, 1988.

ENTRY NO. SELECTION

4-6 oz

6-10 oz cwt/A

U. S. No. l's >10 oz

cwt/A

TOTAL RANK

%

B's No 2's -cwt/A

TOTAL cwt/A

YIELD RANK

51. 52. 53. 54. 55.

AO 84172-6 AO 84175-6 AO 84177-2 AO 84180-1 AO 84180-2

155 84 153 79 100

179 288 176 256 166

46 138 34 258 157

380 510 363 592 423

33 3 37 1 18

85 91 78 96 92

44 25 72 27 34

18 11 14 0 0

447 558 468 619 460

30 6 26 1 27

56. 57. 58. 59. 60.

AO 84183-1 AO 84190-1 AO 84190-2 AO 84209-5 AO 84217-1

100 131 99 117 123

258 145 193 151 150

163 35 168 72 111

521 310 459 340 385

2 63 13 51 29

89 83 94 84 87

52 47 30 47 43

3 14 0 8 10

587 374 489 404 445

2 60 18 51 32

61. 62. 63. 64. 65.

AO 84217-4 AO 84217-5 AO 84223-1 AO 84276-3 AO 84276-4

76 68 82 104 117

84 143 150 120 128

62 103 128 65 42

221 313 361 289 288

86 62 39 72 74

70 84 83 86 88

14 22 22 41 40

40 24 29 4 0

316 374 436 337 327

85 59 35 78 82

66. 67. 68. 69. 70.

AO 84303-2 AO 84311-2 AO 84327-2 AO 84327-3 AO 84345-1

90 57 113 131 90

115 126 160 44 135

50 172 125 0 36

255 355 398 175 262

81 44 22 91 80

78 91 84 50 85

58 12 45 174 45

10 7 12 0 0

327 391 473 349 309

83 54 22 73 86

71. 72. 73. 74. 75.

AO 84355-1 AO 84355-2 AO 84364-4 AO 84364-10 AO 84364-11

133 89 101 115 90

130 179 100 99 146

30 115 77 3 125

293 383 277 217 361

69 30 78 87 40

82 90 80 66 89

52 28 64 113 37

11 12 5 0 0

358 426 346 330 404

70 39 74 81 50

76. 77. 78. 79. 80.

AO 84366-4 AO 84366-10 AO 84377-6 COO 84026-201 COO 84055-205

106 66 21 159 68

206 150 145 212 90

123 118 314 103 157

435 334 480 474 315

16 52 8 9 61

83 91 82 86 84

27 17 15 49 22

59 9 41 18 5

526 368 585 553 373

11 65 3 7 61

81. 82. 83. 84. 85.

COO 84056-201 COO 84056-202 COO 84056-203 AO 84408-203 AO 84418-202

58 65 65 74 137

113 142 115 135 109

118 150 58 116 0

289 356 238 326 245

73 43 84 55 83

88 96 80 83 71

20 10 55 30 99

5 4 0 10 2

330 371 296 391 346

80 62 88 55 75

86. 87. 88. 89. 90.

AO 84427-203 AO 84428-203 AO 84439-205 AO 84439-208 AO 84441-212

73 117 120 93 83

158 171 197 184 129

33 154 41 44 110

264 442 358 321 322

79 15 42 59 58

74 89 87 82 89

53 46 49 53 37

21 0 0 3 3

355 496 410 393 362

71 17 46 53 68

91. 92.

R.B.-Clone 39 R.B.-Gen. IV

142 167

157 224

64 58

329 449

14

76

68 _51

_2

0

435 505

15

AVERAGE CV (%) LSD(.05)

102 33 55

151 32 78

98 52 82

351 19 106

84

46 43 32

11 151 26

417 16 107

53

a2

37

22

Table 2. Performance of entries in the Preliminary Yield Trial, Klamath Experiment Station, 19 ENTRY NO. 1. 2. 3. 4. 5.

SELECTION Russet Burbank Yukon Gold Norgold HiLite NDO 2845-1

STAND

SPECIFIC GRAVITY

N.H., % 1

TYPE2

COLOR3

COMMENTS

97 84 97 84 88

1.086 1.088 1.068 1.073 1.080

13 13 40 20 0

4-5 3 5 5 3

4 2 4 4 2

CRS Ne, Rz. Ne, Nice Ne, Nice Ne

97 100 100 94 97

1.084 1.085 1.077 1.078 1.067

0 23 17 0 13

3 5 5 5 4

2 4 4 4 4

Ugly, IBS Ne, Tearddrops Rz. Nice, Smooth. Pointy

6. 7. 8. 9. 10.

ND0 NDO NDO ND0 NDO

11. 12. 13. 14. 15.

NDO 2876-1 ND0 2876-3 Yellow Finn NDO 2904-1 NDO 2904-6

97 100 100 97 94

1.077 1.069 1.085 1.076 1.068

0 7 0 0 0

5 3 2 4 5

4 4 2 4 4

Ne, Rz., Knobs Ne, small Ugly, poor Nice Ne, big

16. 17. 18. 19. 20.

ND0 NDO ND0 NDO NDO

2904-7 2952-1 2962-7 2965-4 2971-1

69 97 97 100 81

1.065 1.062 1.082 1.091 1.080

23 7 50 7 7

5 3 5 3 5

4 4 4 2 4

Very nice Ugly Growth cracks Ne, IBS Ne, IBS

21. 22. 23. 24. 25.

NDO NDO NDO NDO COO

2976-3 3003-3 3056-3 3057-2 84088-1

94 97 100 97 97

1.070 1.072 1.084 1.065 1.081

13 73 0 13 17

5 4 5 5 4

4 4 4 4 4

Small, poor Ne, ugly Ne, nice Rz., Ne

26. 27. 28. 29. 30.

COO COO COO COO COO

84115-1 84116-1 84159-4 84171-2 84171-3

97 100 100 88 78

1.080 1.089 1.072 1.081 1.074

0 13 33 33 90

5 5 5 4 5

4 4 4 4 4

Ne Teardrops Ne, IBS Teardrops Big, nice Ne, poor shape

31. 32. 33. 34. 35.

COO 84205-2 COO 84206-2 COO 84254-2 COO 84300-2 AO 84026-1

94 94 97 97 97

1.071 1.079 1.078 1.090 1.087

0 0 0 53 7

5 4 5 4 5

4 4 4 5 5

Ne, nice Ne, nice Teardrops, poor Teardrops, growth crac

36. 37. 38. 39. 40.

AO AO AO AO AO

84040-1 84050-2 84060-8 84071-2 84107-1

94 91 91 97 94

1.069 1.091 1.075 1.091 1.072

0 0 7 13 7

5 3 5 5 5

4 4 4 4 4

Rz. Poor Rz., nice Very nice

41. 42. 43. 44. 45.

AO AO AO AO AO

84134-1 84136-2 84154-1 84154-2 84164-4

100 88 91 ,94 97

1.081 1.076 1.080 1.071 1.085

23 20 37 13 57

5 5 5 5 5

4 4 5 4 4

Nice Rz., Ne Bad cracks, scab Ugly Rot, V.D.

46. 47. 48. 49. 50.

AO 84168-1 A0.84170-1 AO 84172-2 AO 84172-3 AO 84172-4

94 100 97 97 100

1.076 1.085 1.089 1.088 1.074

57 7 27 33 0

5 5 5 5 4

4 4 4 4 4

Ne Ne Ne Ne, Rz. Rz., poor

2848-8 2863-6 2864-1 2871-1 2872-1

23

Table 2. (cont'd) Performance of entries in the Preliminary Yield Trial, Klamath Experiment Station, 1988. STAND

SPECIFIC GRAVITY

H.H. % 1

97 97 100 100 97

1.090 1.099 1.086 1.087 1.095

13 67 20 23 13

5 5 5 5 5

4 4 4 4 5

Teardrops, Rz. Rz., very nice Rz., nice, smooth

AO 84183-1 AO 84190-1 AO 84190-2 AO 84209-5 AO 84217-1

97 91 100 100 97

1.084 1.080 1.076 1.067 1.093

57 7 40 0 20

5 5 5 5 5

4 4 4 5 4

Ne, Rz., knobs Ne, pointy, poor Rz., very nice Very nice, smooth Big

61. 62. 63. 64. 65.

AO 84217-4 AO 84217-5 AO 84223-1 AO 84276-3 AO 84276-4

88 100 100 84 75

1.089 1.078 1.070 1.070 1.071

63 0 7 7 7

5 4 4 4 5

4 4 4 4 4

Ugly Rz., Ne, IBS, poor Bad growth cracks Ne, poor shape Ne, IBS

66. 67. 68. 69. 70.

AO 84303-2 AO 84311-2 AO 84327-2 AO 84327-3 AO 84345-1

94 97 100 100 94

1.089 1.075 1.073 1.075 1.076

0 23 13 0 13

5 5 5 5 5

4 4 4 4 4

Ne, nice Knobs, nice Cracks, knobs Small Nice

71. 72. 73. 74. 75.

AO 84355-1 AO 84355-2 AO 84364-4 AO 84364-10 AO 84364-11

91 94 91 100 91

1.076 1.088 1.075 1.074 1.077

0 0 63 0 37

5 5 5 5 5

4 4 4 4 4

Ne Nice, smooth Pointy Small, smooth Rz., Ne, smooth

76. 77. 78. 79. 80.

AO 84366-4 AO 84366-10 AO 84377-6 COO 84026-201 COO 84055-205

100 97 100 97 78

1.081 1.072 1.084 1.076 1.091

'20 70 87 0 43

5 5 4 3 5

4 4 4 3 3

Ne Scab, nice shape Pointy, knobs Rz., Ne, poor Ne, nice

81. 82. 83. 84. 85.

COO 84056-201 COO 84056-202 COO 84056-203 AO 84408-203 AO 84418-202

72 88 94 100 97

1.080 1.081 1.071 1.085 1.112

60 33 33 7 0

5 3 5 5 5

5 4 5 4 3

Ne, scab Ne Nice, smooth Ne, knobs Ne, smooth

86. 87. 88. 89. 90.

AO 84427-203 AO 84428-203 AO 84439-205 AO 84439-208 AO 84441-212

91 100 97 100 94

1.096 1.090 1.086 1.069 1.070

50 0 13 43 43

5 5 5 5 5

4 3 4 3 4

Rz. IBS, scab Rz., poor shape Knobs, poor lot Ne

91. 92.

R.B. - Clone 39 R.B. - Gen. IV

97 100

1.086 1.087

13 0

4 5

4 4

IBS, Ne, Rz. Ne, poor

ENTRY NO.

SELECTION

51. 52. 53. 54. 55.

AO 84172-6 AO 84175-6 AO 84177-2 AO 84180-1 AO 84180-2

56. 57. 58. 59. 60.

1/ H.H. - hollow heart - percent in ten largest tubers/sample 2/ TYPE - 1-pointed, 2-flat, 3-round, 4-long, 5-blocky 3/ COLOR - 1-red, 2-white, 3-buff, 4-brown, 5-dark brown

TYPE 2

COLOR3

COMMENTS

Ne -showing Nematode blemish IBS -Internal Brown Spot CRS -Corky Ring Spot Rz. -Rhizoctonia V.D.-Vascular Discoloration

24 Table 3. Tuber yield by grade for entries in the Oregon Statewide Trial, Klamath Experiment Station, 1988.

ENTRY SELECTION NO

4-6 oz

6-10 oz cwt/A

U. S. No. l's TOTAL >10 oz cwt/A RANK

B's %

No 2's cwt/A

TOTAL cwt/A

YIELD RANK

1. 2. 3. 4. 5.

R. Burbank Lemhi Norgold Norkotah A74212-1E

140 40 117 96 108

137 113 180 172 226

42 266 86 115 239

320 419 384 383 573

49 14 30 32 1

69 .83 93 87 92

89 19 27 30 18

37 43 0 19 27

463 507 415 441 626

36 11 44 40 1

6. 7. 8. 9. 10.

A74212-11. A081178-12 A081216•1 A081362•3 A082254-24

98 71 119 115 93

192 173 133 166 180

. 225 249 62 136 126

514 494 315 417 398

2 3 51 15 25

90 92 83 84 85

22 14 52 45 37

19 22 11 25 25

568 537 381 495 471

2 5 49 14 27

11. 12. 13. 14. 15.

A082260-8 A082281-1 A082283-1 A082611-7 A082616-18

105 77 71 118 116

184 164 142 144 185

112 189 164 112 88

401 430 377 373 389

23 11 34 35 28

85 91 80 80 86

38 28 36 63 51

24 10 50 25 10

470 470 474 466 454

30 29 26 34 39

16. 17. 18. 19. 20.

00083008-1 00083020-5 00083021-1 00083021-5 00083023-9

70 66 49 40 62

157 130 113 52 99

182 124 236 118 69

408 321 398 210 230

21 47 26 55 54

89 75 85 66 78

28 21 14 17 28

19 68 43 61 24

457 427 469 320 296

38 42 32 54 55

21. 22. 23. 24. 25.

00083066-1 00083067-3 00083085-5 00083120-5 00082177-3

63 72 81 73 101

176 154 163 108 179

163 187 166 142 131

402 412 410 322 412

22 17 19 46 16

81 85 90 77 83

33 24 35 36 48

48 42 11 41 19

497 487 457 418 495

13 21 37 43 15

26. 27. 28. 29. 30.

A083005-1 A083010-7 A083019-10 A083026-3 A083029-8

86 124 71 161 79

146 188 199 181 139

124 121 157 41 139

356 433 427 384 356

40 9 12 29 39

91 82 91 78 74

21 36 32 55 19

7 61 6 24 90

391 531 470 490 487

48 6 28 18 23

25

Table 3.(cont'd) Tuber yield by grade for entries in the Oregon Statewide Trial, Klamath Experiment Station, 1988.

ENTRY NO. SELECTION

4-6 oz

6-10 oz cwt/A

U. S. No, l's >10 oz TOTAL cwt/A RANK

%

B's No 2's -cwt/A

TOTAL cwt/A

YIELD RANK

31. 32. 33. 34. 35.

A083037-6 A083037-10 A083065-2 A083088-2 A083093-2

111 89 131 103 97

152 164 123 157 134

106 216 32 136 206

369 469 285 397 437

36 5 53 27 8

77 85 77 82 88

70 30 56 41 22

37 50 18 33 32

479 555 372 482 498

2 3 51 22 12

36. 37. 38. 39. 40.

A083110-3 A083119-2 A083119-3 A083148-1 A083177-5

86 84 72 112 111

173 125 138 177 170

219 174 233 110 130

479 383 443 400 410

4 31 7 24 18

87 74 85 86 83

25 40 29 36 39

34 64 45 26 46

551 520 521 465 495

4 8 7 35 16

41. 42. 43. 44. 45.

A083177-6 A083196-12 A083196-15 A083206-2 A083218-10

134 69 92 34 71

190 93 147 81 183

98 163 171 205 194

423 325 409 320 448

13 44 20 50 6

86 79 88 92 92

46 40 36 12 28

13 41 21 15 10

490 414 467 348 489

17 46 33 53 20

46. 47. 48. 49. 50.

A083222-6 A083222-7 A081323-4 A081323-20 HiLite

104 56 54 69 107

191 140 103 147 168

135 183 162 138 57

431 379 321 353 332

10 33 48 42 43

85 87 78 85 88

43 30 20 44 35

29 24 52 18 7

508 435 413 416 376

10 41 47 45 50

51. 52. 53. 54.

Shepody R.B. Cl 1 R.B. G.IV A7411-2

47 130 112 62

82 177 148 121

231 47 42 173

360 355 301 356

37 41 52 38

77 70 63 73

29 60 78 32

77 68 47 88

470 510 476 490

31 9 25 19

89 29 36

150 23 48

146 35 72

385 17 91

83

36 39 19

33 63 '29

464 13 85

55.

A74114-4 AVERAGE CV(%) LSD(.05)

55

116

154

325

45

88

19

19

368

52

26

Table 4. Performance of entries in the Oregon Statewide Trial, Klamath Experiment Station, 1988. ENTRY NO SELECTION

STAND %

VIGOR, RATING'

SPECIFIC H.H., GRAVITY % 2

TYPES

COLOR 4

COMMENTS 5

1. 2. 3. 4. 5.

R. Burbank Lemhi Norgold Norkotah A74212-1E

96 89 93 93 93

1.8 2.0 1.0 1.3 1.5

1.085 1.085 1.071 1.068 1.079

15 58 30 0 0

5 5 5 5 5

4 4 4 4 4

CRS, tapered, ugly CRS, knobs, ugly CRS Nice CRS, nice

6. 7. 8. 9. 10.

A74212-1L A081178-12 A081216-1 A081362-3 A082254-24

97 85 95 96 85

2.8 2.0 2.0 1.8 1.8

1.081 1.091 1.083 1.082 1.083

0 30 30 5 5

4 5 5 5 5

4 4 4 3 4

CRS CRS, nice CRS, scab CRS, Rz., nice Tapered, ugly

11. 12. 13. 14. 15.

A082260-8 A082281-1 A082283-1 A082611-7 A082616-18

92 97 83 95 96

1.0 1.8 2.0 1.5 1.0

1.086 1.081 1.086 1.089 1.092

25 25 15 5 35

5 4 5 4 5

4 5 4 4 4

IPS CRS, very nice

16. 17. 18. 19. 20.

00083008-1 C0083020-5 00083021-1 C0083021-5 00083023-9

93 86 98 87 83

1.8 2.0 2.5 1.8 1.8

1.088 1.086 1.091 1.088 1.082

5 25 65 88 15

5 5 5 4 5

4 4 3 4 4

Nice Cracks, ugly

21. 22. 23. 24. 25.

00083066-1 C0083067-3 00083085-5 00083120-5 C0082177-3

93 93 93 77 90

2.0 1.5 2.5 1.8 1.0

1.088 1.076 1.080 1.087 1.075

43 0 10 45 43

5 5 5 5 3

4 3 4 4 1

Nice CRS, tapered, knobs

26. 27. 28. 29. 30.

A083005-1 A083010-7 A083019-10 A083026-3 A083029-8

93 97 97 97 88

1.3 1.5 1.0 1.3 1.3

1.092 1.084 1.075 1.084 1.074

28 35 0 0 0

5 5 5 5 4

4 4 4 4 4

CRS CRS, crooked CRS, nice Bad CRS, knobs, ugly Bad CRS, cracks, crooked

CRS, Rz. CRS

Knobs, ugly Cracks

Tapered CRS, nice red



27

Table 4. (cont'd) Performance of entries in the Oregon Statewide Trial, Klamath Experiment Station, 1988. ENTRY NO SELECTION

STAND VIGOR SPECIFIC H.H 4 % RATING' GRAVITY %

TYPES COLOR 4 COMMENTS 5

31. 32. 33. 34. 35.

A083037-6 A083037-10 A083065-2 A083088-2 A083093-2

93 86 98 96 96

2.3 2.0 1.0 1.5 1.0

1.089 1.078 1.081 1.075 1.067

20 20 0 68 0

4

36. 37. 38. 39. 40.

A083110-3 A083119-2 A083119-3 A083148-1 A083177-5

97 87 95 83 94

1.8 2.0 1.5 1.8 1.0

1.079 1.083 1.086 1.084 1.087

41. 42. 43. 44. 45.

A083177-6 A083196-12 A083196-15 A083206-2 A083218-10

98 86 89 96 90

1.8 2.0 1.0 2.0 2.0

46. 47. 48. 49. 50.

A083222-6 A083222-7 A081323-4 A081323-20 HiLite

96 95 98 93 96 94 100 98 96 98

51. 52. 53. 54. 55. 1/ 2/ 3/ 4/ 5/

Shepody R.B. Cl 1 R.B. G.IV A7411-2 A74114-4

5 5

Tapered SEB, cracks CRS, long-skinny

5 5

4 4 4 4 4

70 5 5 15 25

5 5 5 5 5

4 4 4 5 4

CRS Cracks, ugly, rough Nice Odd shape CRS, tapered

1.083 1.083 1.074 1.081 1.084

5 40 15 28 83

5 5 5 5 4

4 4 5 4 4

Cracks,-CRS CRS, Nice Very nice Thumbnail cracks

2.0 2.0 1.0 1.0 1.0

1.083 1.082 1.086 1.086 1.073

43 35 13 20 0

5 5 4 5 5

4 4 4 4 4

Rough CRS, nice CRS, cracks, knobs CRS

1.3 1.5 1.5 1.8 1.0

1.082 1.083 1.084 1.086 1.078

15 10 8 5 10

4 4 5 4 5

2 4 4 5 4

CRS, rough, ugly Cracks, rough, ugly Rough, ugly CRS, long, odd shapes CRS, nice

.

Nice

Vigor rating - September 21, Scale: 1 (completely dead) - 5 (completely green) H.H. - Hollow Heart - percent in ten largest tubers/sample Type - 1-pointed, 2-flat, 3-round, 4-long, 5-blocky Color - 1-red, 2-white, 3-buff, 4-brown, 5-dark brown Comments - CRS - Corky Ring Spot, SEB - Stem End Browning, Rz.- Rhizoctonia, IPS - Internal Purpling Syndrone

28

Table 5.

SELECTION

Tuber yield by grade for entries in the Statewide Chipping Trial, Klamath Experiment Station, 1988.

4-6 oz

YIELD No. l's 6-10 oz >10 oz

TOTAL B's cwt/A

YIELD No. 2's CULLS

TOTAL

Norchip Atlantic Kennebec Monona Shepody

156 137 79 161 64

112 132 138 190 97

55 121 278 96 305

323 390 494 448 466

90 68 31 56 27

32 13 70 5 51

54 5 100 0 30

500 476 695 509 574

NDO 1496-1 00083098-1 NDO 2382-4 NE 22.75-1 BR 7093-24

185 171 210 94 178

130 144 192 112 208

86 68 96 91 100

401 382 499 297 486

85 103 100 53 79

3 1 8 45 6

26 2 12 29 9

515 488 619 423 580

Average CV(%) LSD(.05)

143 19 40

146 26 54

129 31 58

419 17 100

69 30 30

24 59 20

27 64 25

538 11 87

Table 6.

Performance of entries in the Statewide Chipping Trial, Experiment Station, 1988. CHIP, COLOR1

SPECIFIC GRAVITY

H.H.

94 92 98 98 91

3.0 2.0 2.5 2.5 4.0

1.077 1.089 1.082 1.067 1.080

15 35 10 10 25

Cracks in 2's & culls Scab, CRS Bad cracks CRS, brown center

93 89 93 92 100

2.5 3.0 2.0 4.5 2.5

1.091 1.084 1.080 1.071 1.083

5 0 10 20 25

Cracks in culls

STAND SELECTION Norchip Atlantic Kennebec Monona Shepody NDO 1496-1 00083098-1 NDO 2382-4 NE 22.75-1 BR 7093-24

%

2

1/ Chip color - based on Potato Chip/Snack Food Assoc.

scale of 1 5 (1 light, 5 dark) -

2/ Hollow Heart

Klamath

-

-

-

percent in ten largest tubers/sample

3/ CRS - Corky Ring Spot

COMMENTS 3

CRS Scab, bad cracks

29 Table 7. Tuber yield by grade for entries in the Western Regional Trial, Klamath Experiment Station, 1988.

SELECTION

4-6 oz

YIELD U.S. NO.1's 6-10 oz >10 oz

TOTAL B's cwt/A

YIELD No. 2's CULLS

TOTAL

Russet Burbank Norgold Lemhi Red Lasoda

173 118 80 85

195 141 151 198

54 121 249 343

422 380 480 626

88 54 25 34

38 11 65 40

10 5 22 23

559 451 591 723

A7816-14 A7961-1 A79100-1 AC80369-1

111 71 33 63

153 144 91 125

118 144 310 174

382 358 434 362

65 27 13 22

105 44 62 67

. 27 12 8 19

578 441 517 470

C008014-1 NDTX9-1068-11R AC77101-1 C08011-5

96 77 83 64

202 165 144 110

206 188 295 184

504 430 521 358

33 36 18 34

35 34 38 33

11 30 10 14

584 530 587 439

BC0038-1 AC77226-13

83 84

131 144

266 159

480 387

33 41

50 19

4 3

567 450

51 57 52 117 52 120

73 111 89 99 92 170

284 419 297 95. 215 55

407 587 438 311 359 345

15 25 20 63 20 52

99 105 69 15 21 26

38 31 42 5 2 12

559 748 569 394 402 435

83 28 33

136 31 60

209 25 75

429 16 98

36 38 19

49 60 41

16 100 23

530 13 101

Shepody SH-1 Cal Gold ND840-1 A74114-4 Sierra Average CV% LSD (P=.05)

Table 8.

Performance of entries in the Western Regional Trial, Klamath Experiment Station, 1988. STAND X

VINE VIGOR'

99 91 96 100

4.0 2.5 3.8 3.5

1.084 1.070 1.087 1.071

10 20 43 45

5 5 5 10

1 1 3 2

Rough, growth cracks Knobs, skinning, rough

A7816-14 A7961-1 A79100-1 AC80369-1

98 94 94 96

4.0 3.5 3.8 4.0

1.088 1.081 1.072 1.081

50 20 78 43

0 0 10 0

3 1 5 2

Rough, Growth Growth Growth

C008014-1 NDTX9-1068-11R AC77101-1 C08011-5

95 83 99 85

3.3 3.5 3.3 4.8

1.080 1.063 1.072 1.063

5 0 10 0

0 10 0 0

1 1 3 1

Growth cracks, odd shape Severe skinning, cracks Flat, growth cracks, ugly Flat, growth cracks

BC0038-1 AC772 26-13

95 83

3.3 3.5

1".079 1.075

0 10

30 0

1 1

Nice Flattened, nice

Shepody SH-1 Cal Gold

95 94 95

3.0 4.8 3.0

1.078 1.076 1.069

10 43 0

0 5 0

1 4 1

Crooked Crooked, severe skinning Growth cracks, nice shape

1.068

0

15

1

SELECTION

Russet Burbank Norgold Lemhi Red Lasoda

'

ND840-1 A74114-4 Sierra

88 98

89

4,5 2.5

4.3

SPECIFIC GRAVITY

1,066 1.076

A.H. z 2

25 25

CRS X 3

0 0

SCAB RATING4

1 1

COMMENTS

ugly cracks cracks, rough skin cracks

Nice shape Stem-end disc., nice

1/-vine Vigor Rating - Sept. 13 (1-dead, 5-lush) 2/-H.H. - X of 10 largest tubers/plot 3/ Corky Ring Spot X of 10 largest tubers/plot 4/-Scab Rating - 1-none, 5-severe -

-

30

Table 9. Tuber yield by grade for Russet Burbank and five potato selections, Klamath Experiment Station.

SELECTION

YIELD U.S. No. l's 4-6 oz 6-10 oz >10 oz TOTAL B's No 2's CULLS TOTAL cwt/A 1987 Preliminary Yield Trial

Russet Burbank A083010-7 A083019-10 A083037-10 A083196-15

108 68 12 95 20

192 169 142 167 214

97 376 495 414 504

397 613 649 676 738

66 33 14 24 7

32 22 0 37 11

551 715 663 853 775

71 71

57 67

370 503

37 61 6 50 21 10 31 76 35

17 1 5 6 1 4 6 149 12

463 531 470 555 467 454 490 14 103

23 59 8 17 13 20 23 62 24

11 8 2 2 1 5 5 174 NS

489 434 486 534 530 458 488 12 87

56 48 0 116 19

1987 Statewide Yield Trial (Late Harvest) Russet Burbank A082616-18

58 42

85 103

66 194

209 339

33 26

1988 Statewide Yield Trial Russet Burbank A083010-7 A083019-10 A083037-10 A083196-15 A082616-18 Average CV(%) LSD(.05)

140 124 71 89 92 116 105 20 32

137 188 199 164 147 185 170 27 70

42 121 157 216 171

8R,

133 35 70 ,

320 433 427 469 409 389 408 18 110

89 36 32 30 36 51 46 28 20

1988 Screening Procedures Trial Russet Burbank A083010-7 A083019-10 A083037-10 A083196-15 A082616-18 Average CV(%) LSD(.05)

142 91 94 78 92 91 98 19 29

144 139 180 147 165 163 156 16 38

37 84 158 255 216 125 146 35 69

324 314 432 481 473 379 400 16 96

132 53 44 34 43 54 60 30 28