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Biocontrol of Acanthoscelides obtectus and Sitophilus oryzae with diatomaceous earth and Beauveria bassiana on stored grains

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Combined treatment with Beauveria bassiana, and diatomaceous earth (DE) was evaluated against the bean weevil Acanthoscelides obtectus and rice weevil Sitophilus oryzae . DE from Argentina was screened both alone or in combination with water or dry fungal formulations. DE killed 100% of A. obtectus and 68% of S. oryzae showing a significantly higher insecticidal effect than the fungal dust. For A. obtectus , median lethal time (MLT) with the DE–dry fungus was significantly lower than with a fungal aqueous-suspension. In S. oryzae, powder formulations with either of B. bassiana or DE showed a MLT significantly higher than the wet treatments.

Keywords: Coleoptera; Dessicant dust; formulations; mycopathogen; storage

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/09583150500336010

Affiliations: 1: Comisión de Investigaciones Científicas Provincia de Buenos Aires y CIDEFI, Facultad de Ciencias Agrarias y Forestales, UNLP, La Plata, Argentina 2: Terapéutica Vegetal, Facultad de Cs. Agr. y Ftales, UNLP, La Plata, Argentina 3: Instituto de Investigaciones Bioquímicas de La Plata, CONICET, Facultad de Ciencias Médicas, UNLP, La Plata, Argentina 4: CONICET, Centro de Investigación en Pinturas, CIDEPINT, La Plata, Argentina

Publication date: January 1, 2006

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