Ovipositional Deterrence of Methanolic and Etherial Extracts of Five Plants to the Cowpea Bruchid, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

Ovipositional Deterrence of Methanolic and Etherial Extracts of Five Plants to the Cowpea Bruchid, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

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Methanol and diethyl ether extracts of Harmal, Rhazya stricta Decne.; neem seed kernels, Azadirachta indica A.Juss; cloves, Syzygeum aromarticum (L.); citrus peel and Ramram, Heliotropium bacciferum pentair hose (Forssk-) were evaluated for their deterrence to oviposition by Callosobruchus maculatus (F.) on chickpeas in choice tests.

Both extracts of all materials significantly reduced oviposition on treated seeds.Maximum deterrent effects (91.8%) were obtained in the neem seed methanol extract at 0.5% concentration, citrus peel O.l% ether extract (90.

9%), R stricta 0.5% methanol extract (83.9%), and clove 0.1% ether here extract (80.0%).

Methanol extracts of neem seeds and R.stricta evoked higher deterrent effects than their etherial extracts, whereas the responses for cloves and citrus peel were more pronounced in their ether extracts.H.bacirferum % deterrency due to both types of extracts were practically identical.The results encourage future incorporation of such plant extracts as ovipositional deterrents in stored-product lPM programmes.