为了防治远东卷叶虫等虫害,近几年来我场常在苹果花期前后喷布敌百虫,后来发现这个时期喷布敌百虫,能引起幼果大量脱落,严重影响产量。因此,这个问题引起我场广大职工的注意。 一九七一年苹果花后(5月初),我们实验喷布900～1300倍敌百虫加少量碱的药液,观察喷药后的座果情况,结 In order to prevent and control pests such as roller worms in the Far East, I often spray trichlorfon around apple florescence in recent years, and later found trichlorfon sprayed during this period, can cause a large number of young fruit off, seriously affecting the yield. Therefore, this issue has aroused the attention of the majority of workers in our field. Apple flowers in 1971 (early May), we experimentally spray 900 ~ 1300 times trichlorfon plus a small amount of alkali liquid, observe the fruit after spraying the case, the junction