早期采用666土壤处理,即田间幼虫尚未出土以前,土中一次施入666防治桃小食心虫效果好、省工省药。现将我们的试验结果简述如下。 为测定666对桃小食心虫越冬茧内幼虫的药效,我们把带有越冬幼虫的越冬茧放在6厘米厚的药土层中间,于1963年5月27日处理,各处理重复3次,用虫数180头。试验结果表明,越冬茧在药土层内,因666的作用可使大部分的茧内越冬幼虫死亡;药量愈高,幼虫死亡愈多;每亩施用6%可湿性666粉剂10斤、15斤、20斤,茧内幼虫死亡分别为 Early use of 666 soil treatment, that is, before the unearthed larvae in the soil, the soil once applied to prevent peach wormwood 666 good effect, saving labor. Now our test results are summarized below. To determine the efficacy of 666 on cocoon larvae overwintering cocoon, we placed the overwintering cocoon with overwintering larvae in the middle of a 6 cm thick soil layer, which was treated on May 27, 1963, and each treatment was repeated 3 times, With 180 worms. The results showed that the overwintering cocoon in the soil layer, due to the role of 666 can make most of the cocoon inner wintering larvae death; the higher the dose, the more dead larvae; per acre 6% wettable 666 powder 10 pounds, 15 Kg, 20 pounds, cocoon larvae were killed