Both of the two neem extracts showed strongly deterred anti-feeding, growth inhibition, larval toxicity and oviposition deterrent, and the toxicity against early larvae are better than late larvae.

• 两种提取物对瓜绢螟幼虫都具有较强的拒食作用、生长发育抑制作用，对成虫产卵忌避作用效果较好；