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In vitro pathogenicity of the fungi Beauveria bassiana and Lecanicillium lecanii at different temperatures against the whitefly, Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae)

文献类型： 外文期刊

作者： Gadhi, Muswar Ali;Sokea, Tum;Qiu, Dewen;Abdulle, Yusuf Ali;Keerio, Azhar Uddin;Nazir, Talha;Jatoi, Ghulam Hussain;Anwar, Tauqir;Jatoi, Ghulam Hussain;Keerio, Azhar Uddin

作者机构：

关键词： Entomopathogenic fungi; Beauveria bassiana; Lecanicillium lecanii; Virulence; Bemisia tabaci; Temperature degrees

期刊名称： Egyptian Journal of Biological Pest Control

ISSN： 1110-1768

年卷期： 2020 年 30 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： The whitefly, Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae), is one of the most damaging pests in field crops as well as in greenhouses. The present study aimed to evaluate the in vitro pathogenicity of 2 fungus strains of Beauveria bassiana (BB-72 and BB-252) and one strain of Lecanicillium lecanii (V-2) against the whitefly (B. tabaci) at 4 different temperature degrees 20, 24, 28, and 32 degrees C, using a spray method. Three different bioassays were carried out comprised of conidial concentrations and filtrate of fungal strains, BB-72, BB-252 and V-2, and their binary combinations. The 1.5 ml of fungal filtrate was used in filtrate bioassay for each strain of fungus. Three different concentrations (1 x 10(6), 1 x 10(7), and 1 x 10(8) conidia ml(-1)) were used in conidial bioassay for each strain of fungus, whereas in bioassay for binary combination (1 ml conidia + 1 ml filtrate) of BB-72 x BB-72, BB-252 x BB-252, and V2 x V2 were used for these strains of fungus. According to the outcomes, the maximum mortality against whiteflies was observed on 12th day post-treatment. In conidial bioassay, the maximum mortality of B. tabaci was observed in BB-72 isolate (84%), BB-252 isolate (77%), and V-2 isolate (67%) at the highest concentration (1 x 10(8) conidia ml(-1)) at 24 degrees C, and minimum mortality was recorded in BB-72 isolate (33%), BB-252 isolate (29%), and V-2 isolate (19%) at the lowest concentration 1 x 10(6) conidia ml(-1) at 32 degrees C on 12th day post-treatment. Infiltrate bioassay, BB-72 isolate exhibited maximum mortality (92%) at 24 degrees C, and V-2 isolate showed minimum mortality (34%) at 32 degrees C on 12th day post-treatment. Furthermore, in binary combination bioassay, the highest whitefly mortality was recorded in BB-72 x BB-72 isolate (87%), BB-252 x BB-252 isolate (73%), and V2 x V2 isolate (65%) at 24 degrees C and the lowest mortality in BB-72 x BB-72 isolate (57%), BB-252 x BB-252 isolate (50%), and V2 x V2 isolate (39%) at 32 degrees C on 12th day post-treatment. In all bioassays, the BB-72 isolate was the utmost virulent, and application of its filtrate was found to be the most impressive against B. tabaci.

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