吡虫啉拌种控制全生育期小麦蚜虫有效剂量评价

本文对吡虫啉拌种控制全生育期小麦蚜虫有效剂量进行了研究。结果表明，仅用吡虫啉拌种就可在小麦整个生育期将小麦蚜虫控制在防治指标之下，表现出超高效、持效的控制效果。1 kg种子用1.0~4.8 g吡虫啉（有效成分）拌种，从播种至灌浆末期，防治效果在95%以上，至乳熟期（收获期）防治效果仍高达74.49%~96.61%；千粒重比未拌种区增加了26.51%~36.55%。综合以上试验结果，吡虫啉拌种控制全生育期小麦蚜虫的经济、有效剂量为有效成分1.0~2.0 g/kg种子，最佳剂量为1.5 g/kg种子。

Evaluation of the economic effective dosage of imidacloprid by dressing wheat seeds for control of wheat aphids

The control efficiency of imidacloprid to wheat aphids during the whole growing season was measured in fields by dressing seeds. The results showed that the wheat aphid population density was lower than the economic threshold for the whole growing period and the duration for efficiently preventing wheat aphids from damage was more than 7 months only by dressing seeds with 1.0-4.8 g a.i./kg imidacloprid. The control efficiency of all dosages was above 95% from sowing to the end of seed filling. The control efficiency could reach 74.49%-96.61% at milk stage by dressing seeds with 1.0-4.8 g a.i./kg imidacloprid. Compared to the control, the 1 000 grain weight increased by 26.51%-36.55%. Based on these results, the economic effective dosage of imidacloprid was 1.0-2.0 g a.i./kg seed, and the optimum effective dosage was 1.5 g a.i./kg seed.