Comparative Effects of Aqueous Leaves Extracts of Selected Plants Material on Insect Pest of Cowpea (Vigna Unguiculata L. Walp)
A. A. Obadofin; T. A. Fatoba; D. O. Owolabi and B. F. Yakubu
Journal Title:Journal of Environmental Issues and Agriculture in Developing Countries
This study is designed to comparatively investigate the effects of aqueous extracts of some medicinal plants (Datura stramonium, Andrographis paniculata and Chromolaena odorata) on field insect pests damage to cowpea. Ife bimpe cowpea seeds are procured from IITA and planted on beds assigned to four treatment groups (including a control), in a completely randomized design. A 250g/litre of plant material is used to prepare the stock solutions. Field application of extracts is done in the mornings, two times in a week for two months. The findings of the study reveal that the different aqueous extract reduced the activities of insect pests attacking the cowpea leaves in order of D. stramonium > A. paniculata > C. odorata compared with the control thereby encouraged the cowpea plant treated with D. stramonium and A. paniculata to have more leaves, growth flowering and podding than the other groups. D. stramonium and A. paniculata are more effective in controlling insect pest damage to cowpea than C. odorata. It can be concluded that utilization of plant extracts in pest management is a cheap, environmentally friendly alternative to chemical pesticides. However, there is need to test the extracts on other crops, with similar pest problems to verify the elasticity of it effect.