平腹小蜂防治荔枝蝽象试验研究

20 0 0年 2～ 8月 ,在广西北流潮塘、荔宝、花果山等果场进行了平腹小蜂防治荔枝蝽象试验 ,总面积约2 0 hm2 ,8～ 1 0年生龙眼、荔枝树约 4 0 0 0株。根据当地荔枝蝽象的生活习性及发生规律 ,共放蜂 2次 ,结果为 :在放蜂区和对照区内 ,荔枝蝽象卵寄生天敌平腹小蜂、跳小蜂的总寄生率分别为 94 .3%和 1 8.9% ,相比效果明显 ,同时 ,果园中若虫数量显著降低 ,控制在经济危害阈值之下。

The study of control Tessaratoma papillosaby releasing Asastatus japonicus

The experiment of releasing Anastatus japonicus to control Tessaratoma papillosa was conducted in Chaotang,Libao and Huaguoshan orchards in Beiliu county of Guangxi province,the total area is about 20 hectares,there are 4 000 trees of Litchi and Longan in it,and the ages of these trees are about 8～10 years. According to A. japonicus' biology of this region what we have observed in the early of this year,A. japonicus were released twice a year. The total percentages of parasitized egg masses(parasitized by A. japonicus and Ooencyrtus corbrtti F.)were 94.3% and 18.9% respectively in releasing and check areas. The control effect was obvious. The populations of newly hatched nymphs of T. papillosa were reduced significantly. The harm to the trees what caused by the bugs was controlled below the permission value.