Fitness reduction and mortality effects of neem-based pesticides on the Colorado potato beetle Leptinotarsa decemlineata Say (Col., Chrysomelidae).
1992
Kaethner M.
Colorado potato beetle (CPB) adults and larvae were treated in the laboratory with extracts and oil from seed kernels of the neem tree (Azadirachta indica A. Juss.). Beetles exhibited a decreased feeding rate and reduction of fecundity and vitality. Morphogenetic defects were observed on the F1 progeny of treated females. The number of egg masses produced by females which fed on neem-treated potato leaves was smaller. Partly the eggs showed chorion defects and dried up or were affected by fungi. Trials in small scale field plots confirmed the reduction of fecundity in treated beetles. The number of adults in the F1 progeny was reduced to 1 percent of the control group. Larvae showed a highly increased mortality when treated directly with neem oil in the laboratory or fed on oil treated foliage. This result was confirmed in small plot field trials especially when AZT-extract and AZT-extract + neem oil were used. These neem products were highly efficient against all instars of CPB.
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