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Susceptibility of developmental stages of Tetranychus urticae (Acari: Tetranychidae) to infection by Beauveria bassiana and Metarhizium anisopliae (Hypocreales: Clavicipitaceae)

Published online by Cambridge University Press:  15 August 2014

David M. Bugeme
Affiliation:
International Centre of Insect Physiology and Ecology (icipe), PO Box 30772-00100, Nairobi, Kenya Faculty of Sciences, Jomo Kenyatta University of Agriculture and Technology (JKUAT), PO Box 62000, Nairobi, Kenya
Markus Knapp
Affiliation:
International Centre of Insect Physiology and Ecology (icipe), PO Box 30772-00100, Nairobi, Kenya
Hamadi I. Boga
Affiliation:
Faculty of Sciences, Jomo Kenyatta University of Agriculture and Technology (JKUAT), PO Box 62000, Nairobi, Kenya
Sunday Ekesi
Affiliation:
International Centre of Insect Physiology and Ecology (icipe), PO Box 30772-00100, Nairobi, Kenya
Nguya K. Maniania*
Affiliation:
International Centre of Insect Physiology and Ecology (icipe), PO Box 30772-00100, Nairobi, Kenya

Abstract

In the present study, the susceptibility of different developmental stages (eggs, larvae, protonymphs, deutonymphs and adults) of Tetranychus urticae Koch to the entomopathogenic fungi Beauveria bassiana (Balsamo-Crivelli) Vuillemin and Metarhizium anisopliae (Metchnikoff) Sorokin was evaluated in the laboratory. At each developmental stage, four concentrations (3 × 105, 1 × 106, 3 × 106 and 1 × 107 conidia/ml) of both fungi were sprayed. Egg viability and motile-stage mortality varied among the fungal isolates and conidial concentrations. The highest conidial concentration (1 × 107 conidia/ml) significantly reduced the viability of eggs and increased the mortality of motile stages. However, deutonymphs and adults were more susceptible to fungal infection than larvae and protonymphs. The lethal concentration values to 50% (LC50) and 90% mortality (LC90) varied with the fungal isolates and developmental stages. The results show the prospects of B. bassiana and M. anisopliae for the control of T. urticae.

Type
Research Papers
Copyright
Copyright © ICIPE 2014 

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Susceptibility of developmental stages of Tetranychus urticae (Acari: Tetranychidae) to infection by Beauveria bassiana and Metarhizium anisopliae (Hypocreales: Clavicipitaceae)
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Susceptibility of developmental stages of Tetranychus urticae (Acari: Tetranychidae) to infection by Beauveria bassiana and Metarhizium anisopliae (Hypocreales: Clavicipitaceae)
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Susceptibility of developmental stages of Tetranychus urticae (Acari: Tetranychidae) to infection by Beauveria bassiana and Metarhizium anisopliae (Hypocreales: Clavicipitaceae)
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