上海地区豆野螟在扁豆上的发生规律及防治初步研究

Occurrence and Control of Maruca testulalis Geyer in Shanghai

研究了上海地区豆野螟的生物学特性,该虫1年发生4～5代,以蛹越冬,1龄、2龄、3龄、4龄、5龄幼虫头壳分别为0.38±0.09mm、0.69±0.07mm、1.01±0.09mm、1.33±0.07mm、1.73±0.14mm。雌雄成虫寿命分别为6.00±1.22d和5.58±0.59d。雌雄性比1:0.54。初孵幼虫耐饥力平均为1.43±0.49d。从室内药剂防治试验的结果来看,幼虫取食48%乐斯本(毒死蜱)2000倍液、20%杀灭菊酯1250倍液、30%乙酰甲胺磷3000倍液的喷雾叶片,5d后的校正死亡率分别为91.67%、90.00%、76.67%;25%悬浮灭幼脲3号2000倍喷雾,5d后效果逐渐显现,校正死亡率为86.67%。

The bionomics of Maruca testulalis Geyer was observed in Shanghai . It has 4～ 5 generations annually and overwinters as pupa. The width of headcaps ule of the instar larva is 0.38± 0.09 mm, 0.69± 0.07 mm, 1.01± 0.09 mm, 1.13 ± 0.07 mm, 1.73± 0.14 mm respectively. The longevity of female and male is 6.0 0± 1.22 and 5.58± 0.59 days respectively. The sexual ratio of female to male i s 1: 0.54. Average duration for hunger tolerance of 1st instar larva is up to 1 .43± 0.49 d. The tested result in laboratory showed that the corrected mortalit y is 91.67% , 90.00% , 76.67% respectively in sixth days after spraying with 48% Chlorpyrifos 2 000 times, 20% Fenvalerate 1 250 times and 30% Acephat e 3 000 times. In bio- insecticide, the corrected mortality is 86.67% , in fif th day after spraying with 25% Benzoy Iphenyl 2 000 times.