Impacts of an endemic strain of entomopathogenic fungus, Beauveria bassiana, against different life stages of cotton whitefly, Bemisia tabaci, on bean and cotton plants

سلیمانی, پریا and مهرور, علی and واعظ, ناهید Impacts of an endemic strain of entomopathogenic fungus, Beauveria bassiana, against different life stages of cotton whitefly, Bemisia tabaci, on bean and cotton plants. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

The endemic ASMU-JSh2 strain of the fungus Beauveria bassiana against different life stages of cotton whitefly, Bemisia tabaci, on two kinds of host plants, bean and cotton, considering two application methods, dipping of eggs and second instars nymphs as well as spraying the adults with the concentrations of 107 to 103 spores / ml was evaluated. There was no significant difference in the hatching percentage at all the concentrations (except for the concentration 107), but the results show that the pest was more affected by the entomopathogenic fungus on bean than cotton. The highest percentage of cumulative nymphal mortality (90.67%) was observed in bean leaf dipping method with a concentration of 107 spores / ml, which was 60.47% for cotton. The rate of egg-to-nymph conversion in both the plants decreased with increasing fungal concentration. A similar trend is also observed for the conversion of nymph-to-adult and egg-to-adult percentages. Dipping of the leaves containing the second instar nymphs and spraying of the adults at different concentrations indicated a significant effect of all the concentrations on the mortality rates. Therefore, the results of this study showed that cotton whitefly is highly susceptible to the entomopathogenic fungus, B. bassiana, especially in the nymphal stages, and the virulence of this fungus can be affected by the type of host plant.

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