Potential of fungi as biocontrol agents of polyphagotarsonemus latus (Acari: Tarsonemidae) |
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| Authors: | J E Pena L S Osborne R E Duncan |
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| Institution: | 1. Tropical Research and Education Center, University of Florida, 18905 S.W. 280th Street, 330331, Homestead, Florida, USA
2. Central Florida Research and Education Center, University of Florida, 2807 Binion Road, 33703-9598, Apopka, Florida, USA
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| Abstract: | Infection of broad mites, Polyphagotarsonemus latus, by conidia of Beauveria bassiana, Hirsutella thompsonii, and Paecilomyces fumosoroseus conidia was investigated in the laboratory under controlled temperature and moisture conditions. Infection of P. latus by the fungus (LC50) was related positively to the 1.16 × 106 B. bassiana conidia per ml, 2.39 × 103 H. thompsonii conidia per ml, and 1.29 × 105 P. fumosoroseus conidia per ml. Mortality caused by B. bassiana occurred the fastest among densities fluctuating between 65 and 125 mites per leaf. The pathogens B. bassiana and P. fumosoroseus, adjuvants (oil and molasses), and the acaricide ABG6364, a microbial insecticide containing the Beta-exotoxin of Bacillus thuringiensis were evaluated for efficacy against P. latus in a greenhouse test. The B. bassiana treated plants had the greatest and most persistent effect on percentage mortality of total broad mites present per leaf (88 %) followed by the acaricide ABG6364. Use of adjuvants (oil and molasses) did not increase infection of P. latus. |
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