On the use of Cuminaldehyde and Cinnamaldehyde against the Pulse Beetle, Callosobruchus chinensis

Plant-derived organic volatile compounds, cuminaldehyde and cinnamaldehyde, were tested for its insecticidal agents as a substitute of synthetic insecticides. In this investigation, repellent, insecticidal, ovipositional, and egg-hatching inhibitory activities of cuminaldehyde and cinnamaldehyde were evaluated against the pulse beetle, Callosobruchus chinensis (Coleoptera: Bruchidae). Cuminaldehyde and cinnamaldehyde repelled bruchid adults in choice-based oviposition assay. Both volatile compounds killed adults by inhibiting acetylcholine esterase enzyme activity. Reduction in oviposition, egg hatching, fecundity eggs, and progeny production as well as weight loss in cowpea seeds were observed when cuminaldehyde and cinnamaldehyde were used as fumigants. The outcomes of the present study suggest the application of cuminaldehyde and cinnamaldehyde as insecticides in the management of C. chinensis. . KEYWORDS :Callosobruchus chinensis, Cinnamaldehyde, Cuminaldehyde, Hatching inhibition rate, Oviposition deterrence index