Abstract:

In order to clarify the control effect of current mainstream pesticides on Chilo suppressalis (Walker) in early rice in northern Zhejiang, and to screen efficient pesticides for scientific control of Chilo suppressalis (Walker), pesticide efficacy experiments were conducted on early rice. The results showed that the seedling protection effect of cyproflanilide reached 95.64% and the control effect was 92.17% in the new variety. On the early rice variety Zhongzu 18, the seedling protection effect of avermectin-methoxyfenoz was 98.11%, and the seedling protection effects of spinetoram·methoxyfenozide and chlorantraniliprole were similar. The control effects of avermectin-methoxyfenoz and Spinetoram·Methoxyfenozide both reached 95.00%, higher than Chlorantraniliprole (85.00%). On the early rice variety Yongxian 15, the treatment with tetraniliprole+abamectin had the highest seedling protection and pest control effects, reaching 96.30% and 94.44%, respectively. Under the treatment of Bacillus thuringiensis, the number of cocoons of the first generation of parasitic wasps caused by Chilo suppressalis (Walker) on Yongxian 15 was the highest, reaching 1 per hundred clusters. Thus, the recommended chemicals or combinations for the emergency control of Chilo suppressalis (Walker) in early rice in northern Zhejiang are spinetoram·methoxyfenozide, avermectin-methoxyfenoz, tetraniliprole+abamectin. And cyproflanilide can be used as a potential alternative agent, which should be administered for the first time during the peak period of egg incubation, and then applied again on 7 to 10 days later to ensure the control effect.

Key words: early rice in northern Zhejiang, Chilo suppressalis (Walker), pesticide efficacy experiment, cyproflanilide