Abstract:

The efficacy of two flubendiamide ready-mixture insecticides on S. biformis by seed dressing were studied in the paddy field for screening insecticides on S. biformis in direct-seeding late rice, their influence on Chilo suppressalis and Cnappalocrocis medinalis occurrence and the growth of direct-seeding rice were examined. The results showed that the efficacy of protective rice seedling and killing larva of flubendiamide- thiacloprid 48% SC at 4-8 g/kg on S. biformis were 88.89%-95.03% and 85.63%-91.67% 14 days after seed dressing, 87.64%-94.49% and 78.86%-89.69% 21 days after seed dressing, respectively. The efficacy of flubendiamide-thiacloprid 48% SC at 2 g/kg was obviously decreased. Flubendiamide-thiacloprid 48% SC at 4-8 g/kg had better efficacy on C. suppressalis and lower efficacy on C. medinalis, stimulated the growth of rice seedling, increased ripening rate in later period of rice growth and rice yield. Flubendiamide- avermectins 10% SC at 1.5-3 g/kg by seed dressing had better efficacy on C. suppressalis and lower efficacy on S. biformis and C. medinalis. Flubendiamide-thiacloprid 48% SC at 4-8 g/kg by seed dressing on S. biformis and C. suppressalis in rice seedling period was recommended, whereas Flubendiamide-avermectins 10% SC by seed dressing on S. biformis could not be used.