Abstract
Twenty-three isolates of Metarhizium anisopliae (Metschnikoff) Sokorin and three isolates of Beauveria bassiana (Balsamo) Vuillemin (Ascomycota: Hypocreales: Clavicipitaceae) were assessed for their virulence against the two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae). Based on the screening results, nine isolates of M. anisopliae and two isolates of B. bassiana were tested for their virulence against young adult (1- to 2-day-old) female T. urticae at constant temperatures of 20, 25, 30 and 35°C. At all temperatures tested, all the fungal isolates were pathogenic to T. urticae but mortality varied with isolates and temperatures. Fungal isolates were more virulent at 25, 30 and 35°C than at 20°C. The lethal time to 50% mortality (LT50) and lethal time to 90% mortality (LT90) values decreased with increased temperature. There were no significant differences in virulence between fungal isolates at 30 and 35°C; however, significant differences were observed at 20 and 25°C.
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Acknowledgements
We thank Ms E.O. Ouna, Mr R. Rotich and Mr B. Muia for technical assistance. This study received financial support from the SII-Dutch government fund through the African Regional Postgraduate Programme in Insect Science (ARPPIS) of ICIPE and from the German Federal Ministry for Economic Cooperation and Development (BMZ).
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Bugeme, D.M., Knapp, M., Boga, H.I. et al. Influence of Temperature on Virulence of Fungal Isolates of Metarhizium anisopliae and Beauveria bassiana to the Two-Spotted Spider Mite Tetranychus urticae . Mycopathologia 167, 221–227 (2009). https://doi.org/10.1007/s11046-008-9164-6
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DOI: https://doi.org/10.1007/s11046-008-9164-6