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测定几种理化及生物因子对天幕毛虫感染力的影响。结果表明,被感染的幼虫龄期越小,对病毒越敏感,1～2龄幼虫感染率在95％以上,5龄幼虫基本不感病。在18℃以下的温度,幼虫不感受病毒的侵染,24～27℃幼虫发病率最高。涂在叶子表面的病毒多角体经紫外线照射60min,其活性丧失50％以上,照射120min,病毒活性基本丧失竭尽。病毒液喷在果树的向阳面比喷在阴面感染力丧失得快。提纯的多角体干粉、多角体悬液分别在冰箱中保存2～3a,其感染力没有变化,风干的虫尸,无论在冰箱里或在窒温下,经一年保藏,感染力有较大的下降。粗提纯的多角体与虫尸悬液比较,其感染力没有显著差异。
The effects of several physical, chemical and biological factors on the infectivity of Cavy were studied. The results showed that the smaller the age of the infected larvae, the more susceptible to the virus. The larvae of 1 to 2 instar larvae infected more than 95% of the larvae. At temperatures below 18 ° C, the larvae did not experience virus infection, with the highest incidence of larvae at 24-27 ° C. The polyhedra of the virus coated on the surface of the leaves were exposed to ultraviolet rays for 60 min, the activity of which was lost by more than 50% and the irradiation of 120 min, the virus activity was basically exhausted. Virus spray in the sunny side of fruit trees than spray in the negative side of the loss of infection quickly. Purified polyhedron dry powder, polyhedron suspension were stored in the refrigerator 2 ~ 3a, its infectivity has not changed, dried zombie, either in the refrigerator or at stifling temperature, after a year of preservation, the greater the infectivity Decline. There was no significant difference in the infectivity between the crude purified polyhedrin and the parasite suspension.