Indoor toxicity determination and field efficacy trials of several pesticides against Grapholita molesta in walnut production areas of Hotan County
[Objective]In order to screen out pesticides with strong protection and extermination against pear psyllid based on scientific guidance for production.[Methods]In this experiment,the indoor toxicity and field efficacy of five pesticides against pear psyllid were determined by bioassay and spray method respectively.[Results]The experiment showed that the toxicity of 5%emamectin benzoate-lufenuron to the 3rd instar lar-vae of pear borer was the highest,and its LC50 value was 4.12 mg/L,followed by 10%lambda-cyhalothrin,14%chlorpyrifos-permethrin and 10%chlorantraniliprole.The LC50 values were 8.23,15.14 and 16.07 mg/L;25%emamectin benzoate-chlorobenzuron was the lowest toxic with an LC50 value of 40.65 mg/L;while 10%chlorantraniliprole 1,000 times and 5%emamectin benzoate-lufenuron 2,000 times were the most ef-fective in killing the larvae,and the corrected mortality rate of larvae reached more than 85%after 24 h and 100%at 72 h.10%chlorantraniliprole and 5%emamectin benzoate-lufenuron had the best rapid efficacy,and the efficacy of field spraying reached more than 60%after 1 d.The efficacy was 87.72%and 82.46%re-spectively at 5 d after application,which was significantly higher than other pesticides.[Conclusion]In con-clusion,10%chlorantraniliprole and 5%emamectin benzoate-lufenuron have good control effect on pear small heartworm larvae in peach planting area in Hotan County.
国家科技期刊平台
NSTL
万方数据
