桃小食心虫是我区为害枣树的主要害虫,虫果率一般30～50%,严重的高达70%,为此,1985～1990年系统地开展了枣树桃小的主要生物学及防治技术研究。现将部分研究内容介绍如下。 一、幼由生活规律 1.越冬幼虫在土壤中分布:调查了水平和垂直分布,水平分布以树干为中心向外分段挖土筛 Peach mungbean is the main pest of jujube tree in our district, the fruit rate is generally 30 ~ 50% and the severity is as high as 70%. Therefore, from 1985 to 1990, the main biology and control techniques of Jujube the study. Now part of the research described below. First, the young by the law of life 1 overwintering larvae in the soil distribution: surveyed the horizontal and vertical distribution, the horizontal distribution of the tree trunks as the center out of the segment sieve