日本龟蜡蚧在枣树上的发生与危害

１９９６年８月￣１９９７年６月，在陕西大荔县八鱼乡西营村和蒲支县平路庙乡直杜村调查了日本龟蜡蚧在枣树上的分布与危害。结果表明，单叶幼虫数随枣树受害程度的增加而增加，单果重随枣树爱害程度的增加而减少，越冬雌虫的危害造成每股的抽吊数减少，吊长显著变短，每吊的刺树数减少，幼虫和雌成虫在树冠上的分布是阳面（南面）大于阴面（北面），其中树冠中部虫量分布的最多。

THE OCCURRENCE AND DAMAGE OF COROPLASTE JAPONICUS GREEN IN JUJUBE IN SHAANXI

The paper deals with the occurrence and damage of Coroplaste japonicus Green in jujube in Xiying Village,Bayu town,Dali County and Zhishe Village,Pinlumiao town,Pucheng County of Shaanxi during August 1996 to June 1997. The results show that the amount larvae of per jujube leaf increases,while the fruitweight decreases with the increasing of jujube injured degree. The damage of the female adult to the shoots of jujube results in the decrease of the amount spur of the fruit-shoot shortened,the shortening of the spur longth and the decrease of the leaf amount per spur. And the distribution of the larvae and female adult in the crown is that the amount in the south crown is more than that in the north crown.