桑螟绒茧蜂的生物学特性

采用不定期随机取样的方式 ,连续 3年就桑螟绒茧蜂ApantelesheterusiaeWilkinson对桑螟DiaphaniapyloalisWalker的自然寄生率进行了调查。结果表明 ,桑螟绒茧蜂在苏州一带的发生十分普遍 ,其自然寄生率为 2 2. 95 %～ 5 5. 41 % ,平均 3 3 . 99% ,全年各代都处于相对较高的水平 ,其中 9月份第 5代的自然寄生率最高 ,达 5 5 . 41 % ,是当地的优势天敌种群 ,对于桑螟的发生与危害具有明显的控制作用。该文报道了桑螟绒茧蜂的自然寄生情况及其成虫的生物学习性 ,为进一步开展桑螟的生物防治奠定了基础。

The biological characteristics of Apanteles heterusiae

Apanteles heterusias is the natural enemy insect that parasites in the larvae of mulberry pyralid(Diaphania pyloalis Walker). We have studied the parasitical rate of A. heterusiae for three years in succession by taking samples at random and at irregular time. The result shows that A. heterusiae is quite common in Suzhou region and its parasitical rate is very high, which ranges from 22.95 percent to 55.41 percent, with an average value of 33.99 percent and remains at a relatively high level during the year. The natural parasitical rate is the highest in the 5th generation in September, reaching 55.41 percent. Therefore, A. heterusiae is the preponderant natural enemy species and markedly controls the occurrence of mulberry pyralid (D. pyloalis) and its damage. This paper reports the natural parasitical instance, the biological characteristics, and especially the ovipositing habit and the parthenogenesis of the adult and lays a foundation for the further implementation of the biocontrol of mulberry pyralid.