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Effects of Beauveria bassiana and Metarhizium anisopliae on mortality, fecundity and egg fertility of Tetranychus evansi
Author(s) -
Wekesa V. W.,
Knapp M.,
Maniania N. K.,
Boga H. I.
Publication year - 2006
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.2006.01043.x
Subject(s) - biology , beauveria bassiana , metarhizium anisopliae , fecundity , bassiana , larva , mite , biological pest control , conidium , acari , veterinary medicine , botany , population , medicine , demography , sociology
The susceptibility of various developmental stages of Tetranychus evansi Baker & Pritchard (eggs, larvae, protonymphs, deutonymphs and adults) to the entomopathogenic fungi Metarhizium anisopliae (Metschnikoff) Sorokin and Beauveria bassiana (Balsamo) Vuillemin was evaluated under laboratory conditions. Three concentrations (3.0 × 10 6 , 1.0 × 10 7 and 1.0 × 10 8 conidia/ml) of both fungi were used for each stage. The effect of fungal infection on fecundity and egg fertility was also investigated using both fungal species. Deutonymphs that survived the infection and developed into adult females were allowed to oviposit. Adults and deutonymphs were more susceptible to fungal infection than larval and protonymphal stages at all the concentrations. Nevertheless, the concentration level influenced the mortality of the different mite stages. Eggs were also susceptible to fungal infection and mortality was dose‐dependent. Fungus‐treated female mites laid fewer eggs than the controls but there was no significant difference in egg hatchability between the treatments.