Host plant influences pathogenicity of Beauveria bassiana to Bemisia tabaci and its sporulation on cadavers |
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Authors: | Cándido Santiago-Álvarez Elizabeth Araujo Maranhão Eduardo Maranhão Enrique Quesada-Moraga |
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Institution: | (1) Department of Agricultural and Forestry Sciences, ETSIAM, University of Cordoba, Campus de Rabanales, Edificio C4, 14071 Cordoba, Spain;(2) IPA, Caixa Postal 003, CEP 55602-970 Vitória de Santo Antao – PE, Brasil |
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Abstract: | Laboratory bioassays were conducted to determine host plant effect on pathogenicity of the entomopathogenic fungus Beauveria bassiana (Balsamo) Vuill. (Ascomycota: Hypocreales) to the sweetpotato whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae). Fourth instar B. tabaci reared on cucumber, tomato, melon, green pepper, potato, eggplant, marrow, cabbage, bean or cotton, were treated with 1 × 107 conidia/ml B. bassiana EABb 93/14-Tp isolate. Mortality caused by B. bassiana significantly increased with time and it was significantly affected by the host plant on which the nymphs were reared. Mean mortality of nymphs 8 days after inoculation ranged between 52.3±7.3 for nymphs reared on cotton and 91.8±5.8 for nymphs reared on cucumber. Average survival times of nymphs treated with the fungal suspensions were also significantly influenced by the host plant, with a mean of 4.7±0.1 days for nymphs reared on cucumber, 6.6±0.2 days for cotton and 6.9±0.1 days for green pepper. The production of newly formed conidia was also affected by host plant and varied from 111000±8600 conidia/cadaver for nymphs reared on cotton to 597000±28000 conidia/cadaver for those reared on melon. |
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Keywords: | Aleyrodidae Beauveria bassiana Bemisia tabaci entomopathogenic fungi Homoptera host plant microbial control tritrophic level interactions whiteflies |
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