[Bioactivity of azadirachtin and its field efficiency against Spodoptera litura].
In this paper, the effects of varying concentration azadirachtin on tobacco cutworm Spodoptera litura were investigated in both laboratory and field. The results showed that azadirachtin exhibited a wide range of bioactivities, including anti-feeding, growth inhibition, larval toxicity, and oviposition deterrent. This compound could significantly reduce pupal weight and pupation and eclosion rates. After treated with 12 microl x L(-1) azadirachtin for 5 and 7 days, the third instar larvae only weighted 36.8% and 14.5% of the untreated ones, and their development took approximately 6 days longer, with a 27.79% pupation rate and a 37.23% emergence rate, significantly lower than the control by 85.66% and 82.11%, respectively. Azadirachtin was more efficient for the low instar larva than the old ones. Field experiments confirmed that after 7 days application, azadirachtin could effectively control Spodoptera litura, being more efficient than the chemistry pesticide, 10% Chu-Jin SC.
Dai
Jianqing
J
Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences. jqdai@sibs.ac.cn
Huang
Zhiwei
Z
Jiawei
Du
D
D000818:Animals; D005247:Feeding Behavior / Q000187:drug effects*; D007300:Insect Control; D007306:Insecticides / Q000494:pharmacology*; D036701:Limonins / Q000494:pharmacology*; D018411:Spodoptera / Q000187:drug effects / Q000502:physiology*
D007306:Insecticides; D036701:Limonins; C010329:azadirachtin