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Potential of fungi as biocontrol agents of polyphagotarsonemus latus (Acari: Tarsonemidae)

Possibilités d’utilisation de champignons dans la lutte biologique contre P. latus (Acarina : Tarsonemidae)

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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.

Résumé

Une étude sur l’infection de Polyphagotarsonemus lotus par des conidies de Beauveria bassiana, Hirsutella thompsoni et P. fumosoroseus a été conduite en laboratoire dans des conditions de température et humidité contrÔlées. Une corrélation positive a été observée entre l’infection de P. lotus (LC50) et les traitements 1, 16 × 106 conidies/ml de B. bassiana, 2, 39 × 103 conidiés/ml de H. thompsonii et 1, 29 × 105 conidies /ml de P. fumosoroseus. Le taux de mortalité le plus rapide a été causé par B. bassiana au sein des populations de P. latus oscillant entre 65 et 125 individus par feuille. Les pathogènes B. bassiana et P. fumosoroseus, des adjuvants (huile et mélasse) et l’acaricide ABG6364 ont également été testés en serre en vue de déterminer leur efficacité contre P. lotus. L’effet le plus marqué et le plus persistant sur le taux de mortalité de P. latus (88 %) par feuille a été enregistré chez les plantes traitées au B. bassiana, suivies de celles traitées à l’acaricide ABG6364. Les adjuvants (huile et mélasse) n’ont pas fait augmenter la population de pathogènes.

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Authors and Affiliations

  1. Tropical Research and Education Center, University of Florida, 18905 S.W. 280th Street, 330331, Homestead, Florida, USA

    J. E. Pena & R. E. Duncan

  2. Central Florida Research and Education Center, University of Florida, 2807 Binion Road, 33703-9598, Apopka, Florida, USA

    L. S. Osborne

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  1. J. E. Pena
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  2. L. S. Osborne
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  3. R. E. Duncan
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Pena, J.E., Osborne, L.S. & Duncan, R.E. Potential of fungi as biocontrol agents of polyphagotarsonemus latus (Acari: Tarsonemidae). Entomophaga 41, 27–36 (1996). https://doi.org/10.1007/BF02893289

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  • DOI: https://doi.org/10.1007/BF02893289

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