The pink bollworm, Pectinophora gossypiella, is the most destructive pests of the cotton plant in Egypt. Due to the several problems of insecticides, the present study was conducted to evaluate the toxicity effect of the entomopathogenic fungi (EPF), Beauveria bassiana and Metarhizium anisopliae, against the different stages of the pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) The fungal isolates exhibited a toxic effect against the treated stages, egg, larva, and pupa. According to the obtained data of LC50, B. bassiana was more potent in inducing toxicity than M. anisopliae. However, eggs of P. gossypiella were less susceptible to the EPF than the other stages. Based on total mortality, LC50 was 4.97×1011, 6.03×1012 spores/ml for egg; 8.25×108, 6.03×109 spores/ml for neonate; 2.52×108, 1.29×1010 spores/ml for early 4th instar larvae; and 6.79×108, 8.36×109 spores/ml for pupae after treatment with B. bassiana and M. anisopliae, respectively. Entomopathogenic fungi exhibited an activity in inducing mortality against different stages of P. gossypiella.

中文翻译：

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球孢白僵菌和绿僵菌对粉红铃虫不同阶段的毒力，Pectinophora gossypiella (Saunders)（鳞翅目：Gelechiidae）

粉红铃虫 Pectinophora gossypiella 是埃及棉花植物中最具破坏性的害虫。由于杀虫剂存在的几个问题，本研究旨在评估昆虫病原真菌（EPF）白僵菌和绿僵菌对不同阶段的粉红铃虫Pectinophora gossypiella（Saunders）（鳞翅目：Gelechiidae）的毒性作用) 真菌分离物对处理过的阶段、卵、幼虫和蛹表现出毒性作用。根据获得的 LC50 数据，B. bassiana 比 M. anisopliae 更有效地诱导毒性。然而，与其他阶段相比，棉铃虫卵对 EPF 的敏感性较低。以总死亡率计，LC50为4.97×1011，鸡蛋为6.03×1012孢子/ml；新生儿8.25×108、6.03×109孢子/ml；2.52×108, 1. 29×1010 个孢子/毫升，用于 4 龄早期幼虫；用 B. bassiana 和 M. anisopliae 处理后的蛹分别为 6.79×108、8.36×109 个孢子/ml。昆虫病原真菌表现出诱导不同阶段棉铃虫死亡的活性。