两种昆虫病毒混合使用试验

LABORATORY AND FIELD EXPERIMENTS ON MIXED APPLICATION OF GRANULOSIS VIRUS AND NUCLEAR POLYHEDROSIS VIRUS

室内试验,将菜粉蝶颗粒体病毒(2×10^(-3))和银纹夜蛾核型多角体病毒(2.52×10~6)两株病毒液,等量混合后浸菜叶,5次共喂养菜青虫3964头和银纹夜蛾幼虫1601头,其死亡率分别为96.2％和96.3％。经3年大田试用,结果基本一致。1990年在泰安市郊使用这两株病毒混合液喷洒甘蓝,混施区总虫口下降率91.5％,而单独使用区PrGV(3×10^(-3))、PaNPV(1.5×10~6)以及氧化乐果(1000倍液)的虫口下降率分别为65.1、37.9和73.1％。

In a laboratory bioassay, leaves of Chinese cabbage were dipped in an equal-volume mixture of the GV of Pieris rapae (PrGV) (at the concentration of lX10-3)and NPV of Plusia agnata (at the concentration of 2.52×106). The leaves were then fed to 3964 larvae of P. rapae and 1601 larvae of P. agnata, resulted in a mortality of 96.2% and 96.3%, respectively. Mixed application of the two viruses was tested in the cabbage fields of the suburbs of Taian City, Shandong Province in 1990. A 91.5% reduction of the total pest populations was obtained. In comparison, the pest population reduction in the fields where PrGV (at 3×10-3 ), PaNPV (at 1.5×106) and Omethoate were used alone was 65.1%, 37.9%, and 73.1%, respectively.