The polyhedral inclusion bodies (PIBs) of Spodoptera littoralis nucleopolyhedrosis virus (SlNPV) were extracted from droppings of both the house sparrow Passer domesticus Raf. and the cattle egret Bubulcus ibis Bon. Due to the wide host range of the SlNPV, the extracted PIBs were bioassayed versus newly hatched larvae (L1) of S. littoralis, S. exigua, Trichoplusia ni, and Autographa circumflexa belonging to the insect fauna of the Egyptian clover Trifolium alexandrinum L. and the greater wax moth Galleria mellonella. Mortality of treated neonates of the 5 tested insect species ranged between 80 and 100 % after 7 days from ingesting the PIB-contaminated diet. Feeding nymphs and adults of the earwig Labidura riparia Pallas on S. littoralis larvae infected with the nuclear polyhedrosis virus (SlNPV) passed viable PIBs in feces which were extracted and bioassayed versus lepidopteran larvae of L1. All of the virus-treated 5 lepidopteran species became infected with the virus and showed mortality of 44–96% at the 7th day post ingestion of the extracted PIBs. On the other hand, feces extract of the 3rd larval instar (L3) of the lacewing Parachrysopa pallens (R.) fed on the virus-diseased larvae of S. littoralis caused no mortality when assayed versus the 5 tested lepidopteran larvae proving absence of viable PIB polyhedra that might be due to the mode of larval feeding by external digestion of its host contents including the polyhedra. Results explain the potential role played by insectivorous birds in spreading the nucleopolyhedrosis viruses in the agroecosystem as well as certain predatory insects.

中文翻译：

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两种食虫性鸟类和两种昆虫捕食者在埃及生态系统中传播斜纹夜蛾核多角体病毒（S1 NPV）的潜力

从家麻雀Passer domesticus Raf的粪便中提取斜纹夜蛾核多角体病毒（SlNPV）的多面体包涵体（PIB）。还有牛背鹭Bubulcus ibis Bon。由于S1NPV的宿主范围很广，因此对提取的PIB进行了生物分析，将其与属于埃及三叶草Trifolium alexandrinum L.的昆虫动物区系的S. littoralis，S。exigua，Trichoplusia ni和Autographa circumflexa的新孵出的幼虫（L1）进行了生物分析。以及更大的蜡蛾。摄入受PIB污染的饮食后7天，接受测试的5种昆虫种类的新生儿的死亡率在80％至100％之间。在S上喂养幼虫Labidura riparia Pallas的若虫和成虫。与L1鳞翅目幼虫相比，感染了核多角体病毒（SlNPV）的立冬幼虫在粪便中通过了可行的PIB，并进行了生物分析。所有经病毒处理的5种鳞翅类动物均被该病毒感染，并在摄入提取的PIB后第7天显示出44-96％的死亡率。另一方面，饲喂以病毒感染的滨海链球菌幼虫为食的草翼Parachrysopa pallens（R.）的三龄幼虫（L3）的粪便提取物，与经检测的5种鳞翅目幼虫相比，经测定与实验结果一致，没有引起死亡PIB多面体可能是由于幼虫通过其宿主内容物（包括多面体）的外部消化而进食的方式。