Abstract
Chemical storage pest control is interlinked with many challenges such as environmental pollution and toxicity to humans and animals. Alternative tools are thus being increasingly researched and applied to supplement and/or substitute old-fashioned chemical means. Entomotoxic proteins, such as the lectins of leguminous seeds, have been shown to be effective alternative control agents against many serious insect pests. The objective of this work was to evaluate the effect of the flour of three leguminous seeds, Phaseolus vulgaris L. (Fabaceae) (the common bean), Vicia faba L. (Fabaceae) (the broad bean) and Glycine max L. (Fabaceae) (the soya bean), against 4th instar larvae of Trogoderma granarium Everts (Coleoptera: Curculionidae). The flours were tested at different concentrations. They all demonstrated significant effects on larval mortality, as well as they all induced a decrease in the number of larvae reaching the pupal stage. The flours of P. vulgaris and V. faba were highly insecticidal against T. granarium larvae, especially at the highest concentrations (86.7% for PV100 and 90% for VF100). Our results enrich previous findings on the entomotoxic effect of leguminous plant lectins and highlight P. vulgaris and V. faba lectins as potential alternative control agents against T. granarium.
Highlights
Insects constitute the major pests of stored products whereby insect-related damage impacts the quality, quantity, and commercial and agronomic value of these food products
The objective of this study was to test the lectin insecticidal properties of three leguminous flours derived from seeds of Phaseolus vulgaris L. (Fabaceae: Faboideae), Vicia faba L. (Fabaceae: Faboideae) and Glycine max L. (Fabaceae: Faboideae) against 4th instar larvae of T. granarium
All the flours derived from the seeds of the three edible leguminous crops demonstrated noteworthy insecticidal action against the T. granarium larvae
Summary
Insects constitute the major pests of stored products whereby insect-related damage impacts the quality, quantity, and commercial and agronomic value of these food products. Trogoderma granarium Everts (Coleoptera: Dermestidae), known as the khapra beetle, has been attributed the status of a quarantine organism [2] and has been classified among the most invasive species on a global scale [3]. It can survive extreme conditions for long periods of time, and it exhibits increasing resistance to several mainstream chemical insecticides as well as other non-chemical methods [4].
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