【摘要】 研究白刺夜蛾幼虫的食量和防治指标。结果表明 ,幼虫可分为 5龄 ,各龄幼虫的日食量依次为 4.81、1 2 .39、37.56、1 30 .68和 483.2 5mg/头 ,幼虫期总食量 2 4 53.58mg/头。根据食量测定 ,研制的防治指标为 39.7头 /m2 ,经济允许损失水平为 1 2 .5%。更多还原

【Abstract】 The daily grazing capacity (DGC)and the action threshold for control of L.simyrodes S. was studied in Jinchang city,Gansu province during 1996-1998.The daily grazing capacty of the lavas stages was measured as 4.81,12.39,37.56,130.68 and 483.25mg/head respectively.and the total grazing capacity was 2453.58mg/head.Based on DGC,the action threshold was obtained as 39.7 individuals/m 2,the economic tolerant yield loss rates is 12 5%.更多还原