Mixing Effect of Neem Seed Oil (Azadirachta indica A. Juss.) With Some Wheat Varieties for the Control Of The Khapra Beetle, Trogoderma Granarium Everts

• Mohamed S. Fouad
• Plant Protection Dept., Fac. Agric. Minia Univ. , Minia, Egypt.
• The Third International Conference onIPM Role in Integrated Crop management and Impacts on Environment and Agricultural Products. 26-29 November 2005, Giza, Egypt.

Abstract

The effect of mixing neem seed oil at different rates (1, 2, 4 and 8 ml/kg grain) with some wheat varieties (Sids, 1,4; Giza 164, 168 and Beni-suef 1,3) for the control of T. granarium was determined. Results showed that, wheat varieties of Giza 164 and Giza 168 were the least susceptible to infestation with the T. granarium (characteristics by the longest developmental period, the lowest mean percentage of adult emergence, the least percent of weight loss and the least value of susceptibility index). Also, neem seed oil (NSO) was effective in protecting the grains of various wheat varieties against T. granarium, however the different rates of NSO interacted with wheat varieties resistance and significantly increased larval mortality and reduced the percentage of adult emergence. Moreover, NSO at different rates was significantly increased the developmental period of the different stages of this insect reached 28-39 days at 8 ml/kg grain as compared to the check (21.5-34.0days) in the different wheat varieties. In addition, NSO at different rates caused a significant reduction of the percentage of weight loss of the different grain wheat varieties as well as reduced the weight loss from over 20% in the control to less 5% in the different wheat varieties.