【摘要】 田同试验结果表明:大菜粉蝶颗粒体病毒（PbGV）防治甘蓝地上菜粉蝶幼虫的最低有效剂量在2.3×10¹⁰～3.4×10¹⁰颗粒体/亩之间;病毒的喷布应在寄主卵与低龄幼虫的高峰期进行,春夏季以在田间寄主卵孵化率近20％时使用为宜。喷布的雾滴细,可以提高防治效果。病毒与乐果、氧化乐果、乙酰甲胺磷等农药临时混用。不降低防治效果,降雨对病毒防治效果的影响不明显。在135.8亩的肪治示范试验中,菜粉蝶的虫口减退率均在90％以上,效果好且稳定。更多还原

【Abstract】 The field tests indicated that: The lowest effective dosage of the gra-nulosis virus from Pieris brassicae ( PbGV ) in the control of the small white butterfly, Artogeia rapae was in a range of 2.3 × 1010- 3.4 × 1010 GIB/mu. the GV should be sprayed in the peak period of the eggs and the low instar larvae. la spring and summer, it should be used when the hatching rate reached to about 20%. The control effects would not be negatively affected if the GV was mixed with dimethoate, omethoate and acephate just before the spraying, or it was raining in the test period, and it could be improved when the GV was sprayed in thinner droplets. In an exemplary control on an aera of 135.8mu, the number of the pest was reduced more than 90% for-each plot in 7 days after the spraying.更多还原