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Investigation on the insecticidal efficacy of novel pellet formulation based on Eucalyptol, botanical constituent, and Poly (vinyl alcohol) against 3 major stored products beetles Sharifian, I.1, M. H. Safaralizade1, P. Najafi Moghaddam2, A. Abdolmaleki1 and A. Ebadollahi1 1.Department of Plant Protection, Faculty of Agriculture, Urmia University, P.O. Box: 165,
[email protected] 2. Department of Chemistry, Faculty of Science, Urmia University Application of essential oils fumigant toxicity, in stored products pests' control has sharpened recently. The aim of this study was application of pellet formulation and controlled release technology for obviation of essential oils low penetration power and vapor pressure defect. Poly(vinyl alcohol) has been used as a polymer matrix for encapsulation of the reactive agents in pharmaceutics and agriculture, because of its biodegradability, low price and non toxicity for mammals. In this research, Eucalyptol based pellets were prepared by Dry Mixing Method and physical load of Eucalyptol on PVA which followed by pressing the mixture using FTIR pellet maker apparatus to form pellets. Afterward insecticidal efficacy of produced pellets were investigated against adults (1-3 days old) of Tribolium castaneum (Herbst), callosobruchus maculatus (F.) and Rhyzopertha dominica (F.) under 28±2ºC and darkness in laboratory conditions. According to primary tests 1 gram pellets had most control efficacy in comparison with other tested pellet weights. LC50 and LC95 values of 1 gram pellets against rust-red flour beetle, T. castaneum in 24 h were 1.6 and 5.2 ml ai/L air respectively and for lesser grain borer, R. dominica and cowpea beetle C. maculatus in 12 h were 0.3, 0.71, 0.94 and 1.9 ml ai/L air respectively. Also penetration tests result for determination of reeked Eucalyptol penetration, in different depths of wheat mass showed that 1 gram pellets with 2:5 doses had penetrated fumigant toxicity against lesser grain borer, cowpea beetle and rust-red flour beetle in 32.5±2.5, 27.5±2.5 and 12.5±2.5 cm respectively.
19th Iranian Plant Protection Congress, 31 July3 August 2010
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