The Earias spp. are devastating pests which reduce cotton yield up to 40% as seed cotton. Efficacy of Metarhizium anisopliae and Beauveria bassiana as bio-insecticides were investigated against the spiny bollworm, Earias insulana Boisduval (Lepidoptera: Noctuidae), under field conditions in Egypt throughout two successive seasons 2018 and 2019. Results showed E. insulana population reduction during both seasons after bio-insecticidal applications. M. anisopliae strains (S1, S2) treatments showed significant reductions in the mean numbers of infested bolls with E. insulana after 14 days from the 1st spray. Reduction percentages of E. insulana infestation reached to 77.74 and 76.51% respectively, after application of M. anisopliae strains (S1, S2) treatments; then, the infestation reduction percentages increased to 88.48 and 85.41% after the 2nd spray by the same fungal strains; then, the infestation reduction percentages increased to 90.16 and 90.84% after 3rd spray of the same fungal strains in season 2018. In 2019 season, the infestation reduction percentages of E. insulana was 85.48 and 80.75%, after the 1st spray of M. anisopliae strains (S1, S2), respectively, which increased to 92.40 and 89.87%, after 14 days from the 2nd spray by the two fungal strains respectively, and then increased to 94.12 and 93.73%, after 14 days from the 3rd spray of M. anisopliae (S1 and S2) respectively. In season 2018, the infestation reduction percentage of E. insulana by B. bassiana strains (S1, S2) recorded 73.09 and 71.89%, respectively and 81.04 and 82.89% respectively, in season 2019, after 14 days of the 1st spray. While after the 2nd spray of the two tested B. bassiana strains, the infestation reduction percentage of E. insulana was 85.41 and 85.41% respectively, in season 2018, whereas it was 89.16 and 89.16% respectively, in season 2019. Then after 14 days of the 3rd spray by the same fungus strains, the reduction percentage of E. insulana increased to 86.56 and 85.35%, respectively, in season 2018, and 90.83 and 90.83% in season 2019. Tested strains of B. bassiana and M. anisopliae fungi proved their potential for decreasing E. insulana infestation percentages through 2–3 spray treatments under field conditions.

中文翻译：

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两种昆虫病原真菌的现场评估； 白僵菌和绿僵菌 作为针对多刺棉铃虫，一个生物防治剂Earias insulana叶螨（夜蛾）棉花植物

Earias spp。是毁灭性害虫，可将棉籽棉的籽粒产量降低多达40％。在埃及和埃及的整个连续两个季节中，在野外条件下研究了金属互生假单胞菌和球孢白僵菌作为生物杀虫剂对有刺棉铃虫Earias insulana Boisduval（鳞翅目：夜蛾科）的功效，在整个2018年和2019年的两个连续季节中。生物杀虫剂应用后。第一次分离喷洒14天后，M。anisopliae菌株（S1，S2）的处理显示，被insulana感染的棉铃的平均数显着减少。应用异种分枝杆菌菌株（S1，S2）处理后，棉铃虫的侵染减少率分别达到77.74％和76.51％。然后，侵扰减少的百分比增加到88.48和85。第二次喷雾后相同真菌菌株占41％；然后，在2018年第3季对同一真菌菌株进行第3次喷雾后，侵染减少的百分比分别增加到90.16和90.84％。在2019年季节中，在第1次喷施芒孢分枝杆菌后，印度短肠沙门氏菌的侵染减少的百分比分别为85.48和80.75％。两种菌株分别在第二次喷雾后14天后分别增加至92.40和89.87％，然后在第三次喷雾后14天后分别增加到94.12和93.73％。分别为（S1和S2）。在2018年第一季喷洒14天后，球孢杆菌菌株（S1，S2）侵染导致的大肠埃希菌减少百分率分别为73.09％和71.89％，分别为81.04和82.89％。在两次测试的球孢白僵菌菌株的第二次喷雾后，