Pesticidal Activity of Wild Mushroom Boletus satanas Lenz Extracts against Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) in Stored Maize Grains

Masota, N.E. and Sempombe, J. and Mihale, J.M. and Henry, L. and Mugoyela, V. and Sung'hwa, F. (2017) Pesticidal Activity of Wild Mushroom Boletus satanas Lenz Extracts against Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) in Stored Maize Grains. East and Central African Journal of Pharmaceutical Sciences, 20. pp. 17-26.

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Abstract

Boletus satanas Lenz (Boletaceae) is a basidiomycete fungus reported to contain monomeric glycoproteins (lectins) which are known to possess insecticidal, larvicidal, ovicidal and anti-nutritional activities. This study was carried out to assess the toxicity, anti-feedant and repellence potential of the crude methanol extract of the mushroom in stored maize grains. Six levels of concentration ranging from 0.05 to 0.5% w/w were used during the assessments. Untreated grains and grains treated with 2% Actellic gold TM dust (0.05% w/w) were used as negative and positive controls, respectively. The experiments were carried out in a completely randomized design with three replicates made for each treatment level and controls. The 0.5% w/w methanol extract exhibited the highest mean mortality of 68.3% and 94.2% inhibition in F1 progeny. Moreover, 89.7% reduction in grain damage and 98.3% pest repellence were observed. These findings render credence to the use of B. satanas as a potential biopesticide by subsistence farmers to preserve grains and corroborate the ongoing IPM strategies.

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