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| Laboratory Toxicity of Spinetoram Against Eggs and Larvae of Spodoptera frugiperda in Wuhan |
| WANG Yong ☆，YANG Fan ☆，ZHOU Lilin，LUO Haibo，SI Shengyun，WANG Pan* |
| Institute of Vegetables，Wuhan Academy of Agricultural Sciences，Wuhan 430345，Hubei，China |
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Abstract The laboratory toxicity of spinetoram at different concentration gradients against the eggs and different instars larvae of Spodoptera frugiperda in Wuhan was evaluated using the soak and foliage application methods．The results showed that spinetoram had certain inhibitory effect on the hatching of the eggs of S. frugiperda，and showed high toxicity against newly hatched larvae．The lethal medium concentration（LC50）of spinetoram to 2-4 instars larvae were 0.025，0.070 and 0.269 mg · L-1，respectively．In conclusion，spinetoram can still be used as an emergency chemical control insecticide for S. frugiperda，with a focus on the critical window period of application before the 3rd instar stage．
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Received: 18 May 2023
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