Citation: | LIN Sukun, LIU Kaihong, WANG Ruifei, et al. Indoor toxicity of azadirachtin to Spodoptera frugiperda and its control effect in field[J]. Journal of South China Agricultural University, 2020, 41(1): 22-27. DOI: 10.7671/j.issn.1001-411X.201908012 |
To evaluate the toxicity and control effect of azadirachtin to Spodoptera frugiperda and provide a technical reference for prevention and control of Spodoptera frugiperda.
The toxicity and field control effect of azadirachtin on Spodoptera frugiperda were determined by soaking leaf method and spraying method.
Under indoor condition, the LC50 values of 2nd and 3rd instar larvae were 0.59 and 0.46 mg/L respectively, when treated with 0.3% azadirachtin EC after seven days; At seven days after treated with 40% azadirachtin dry powder, the LC50 values of 2nd and 3rd instar larvae were 0.93 and 0.79 mg/L respectively; At three days after treated with 0.3% azadirachtin EC, the AFC50 values of 2nd and 3rd instar larvae were 0.30 and 0.12 mg/L respectively; At three days after treated with 40% azadirachtin dry powder, the AFC50 values of 2nd and 3rd instar larvae were 0.53 and 0.30 mg/L respectively. When 0.3% azadirachtin EC was diluted 500 times and sprayed on corn, the control effects on S. frugiperda reached 24.83%, 50.34% and 75.50% after 1, 3 and 7 days respectively.
Azadirachtin has good toxicity and antifeedant activity, and the control effect on S. frugiperda is better at seven days after treatment. Azadirachtin has a broad application prospect in controlling S. frugiperda.
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