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Farm‐scale trials to compare the entomopathogenic fungus Beauveria bassiana with pirimiphos methyl + deltamethrin and essential oil of lemon grass for protection of stored cowpea against Callosobruchus maculatus (Coleoptera: Bruchidae)
Author(s) -
Cherry A.J.,
Abalo P.,
Hell K.,
Korie S.
Publication year - 2007
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2007.00146.x
Subject(s) - beauveria bassiana , bassiana , deltamethrin , biology , callosobruchus maculatus , entomopathogenic fungus , conidium , toxicology , weevil , piperonyl butoxide , infestation , horticulture , neem oil , pesticide , biological pest control , agronomy , pest analysis
In trials conducted in Benin, conidia of Beauveria bassiana were evaluated as a control method against the cowpea weevil, Callosobruchus maculatus , in stored cowpea. In the first trial using a high artificial infestation of C. maculatus in 8‐kg batches of cowpea in jerry cans under typical conditions, concentrations of 1 × 10 9 and 1 × 10 11 conidia kg −1 were compared with lemon grass oil at 2 mL kg −1 and the synthetic pesticide mixture of 1.5% pirimiphos methyl + 0.05% deltamethrin at 0.5 g kg −1 . After 2 months of storage, seed losses (SD) were 20.63 (5.3)% in the untreated control, 8.04 (3.2)% in the low‐dose B. bassiana group, 3.12 (1.3)% in the high‐dose B. bassiana group, 2.52 (0.4)% in the lemon grass oil group and 0% in the pirimiphos methyl + deltamethrin group. In a second trial with natural infestations in 50‐kg batches of cowpea in 200‐L drums, treatment with B. bassiana 1 × 10 11 conidia kg −1 was compared with pirimiphos methyl + deltamethrin at 0.5 g kg −1 . After 6 months of storage on six farms, losses reached 30.76 (1.5)% in the control, 1.28 (0.2)% in the pirimiphos methyl + deltamethrin group and 3.69 (0.6)% in the B. bassiana group.