The efficacy of some botanical insecticides againstcommon bean bruchids (zabrotes subfasciatus boh and acanthoscalides obtectus say)
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Date
2008
Authors
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Journal ISSN
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Publisher
Sokoine University of Agriculture
Abstract
Laboratory studies were carried out to investigate the effectiveness of nine botanical
extracts in three formulations for the control of common bean bruchids, Zabrotes
sabfasciatus Boh. and Acanthoscalides obtectus Say. on common beans and to
compare the performance of dust, water and oil extract formulations. Powder
formulation of Ocimum canum, Tagetes minuta, Eucalyptus globus, Ricinus
communis leaves and Neuteraunenia mitis tuber were tested under laboratory
conditions. The effectiveness of the extracts was compared with actellic super dust a
synthetic chemical (pirimiphos methyl + permethrin) commonly used for control of
bean bruchids, T.minuta was the least effective botanical followed by R. communis,
O. canum and E. globus while N. mitis was the most effective, the mortality of
weevils after 14 days was 100% as that of Actellic Super Dust. The results indicate
that all tested botanicals have potential for protecting bean seeds against infestation
by bean weevils, but N. mitis is the most effective. Water extracts formulation of O.
canum, T. minuta, E. globus and R. communis had lower efficacy compared to N.
mitis and Actellic Super Dust which had performed better. Oil extracts of botanicals
have shown higher efficacy on bean weevils as Actellic Super Dust, and therefore
have potential for protecting stored beans against infestations. The result from this
study showed that N. mitis extracts and all oil extracts have higher efficacy as that of
Actellic Super Dust on protecting common beans against common bean bruchids.
Hence, can be used efficiently as the recommended synthetic insecticides.
Description
Dissertation
Keywords
Botanical insecticides, Againstcommon bean bruchids, Acanthoscalides obtectus, Zabrotes subfasciatus boh, Bean bruchids