Bioactivity of azadirachtin and its field efficiency against Spodoptera litura

Abstract

Abstract: 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 μl·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.

Key words: Azadirachtin, Spodoptera litura, Bioactivity, Anti-feeding effect

CLC Number:

S436.36

DAI Jianqing, HUANG zhiwei, DU Jiawei . Bioactivity of azadirachtin and its field efficiency against Spodoptera litura[J]. Chinese Journal of Applied Ecology, 2005, 16(6): 1095-1098.

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