Field evaluation of levo 2.4 sl (Botanical) for the Management of Insect Pests of Eggplant (Solanum melongena L.) and Okra (Abelmoschus esculentus L. Moench)

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Renewed interest in the use of botanical insecticides for the management of insect pests necessitated field experiments to be carried out during the major and minor cropping season at the plantation crops section of the Department of Crop and Soil Sciences of the Kwame Nkrumah University of Science and Technology, (KNUST) in 2013 to evaluate insecticidal potency of Levo (botanical insecticide) for the management of insect pests of eggplant (Solanum melongena L.) and okra (Abelmoschus esculentus L. Moench). The trial comprised the following treatments: (i) Levo (a.i. Oxymatrine) at 1.68 ml /0.5 litre water, (ii) Lambda-super (a.i. Lambda-cyhalothrin) at 1.5 ml /0.5 litre water and (iii) A control (water only). Leuninodes orbonalis (Guen), Bemisia tabaci (Gennadius), Aphis gossypii (Glover), and Eublemma olivacea (Walker) were collected on eggplant and Podagrica spp. (Jac.), Bemisia tabaci (Gennadius), and Aphis gossypii (Glover) on okra in the study area. Significant differences (P ˂ 0.05) were observed among the treatments with respect to the abundance of A. gosspyii, L. orbonalis, B. tabaci and E. olivacea on eggplant during the major season. Similar results were obtained in the minor season. There were significant differences (P ˂ 0.05) in Podagrica spp., B. tabaci and A. gosspyii densities between insecticide-treated and the control plots of okra in both seasons. The damage caused by Podagrica species to okra leaves was significantly different (P ˂ 0.05) among treatments plots in both seasons. Significantly higher yields were obtained from the insecticide-treated eggplant plots but no significant differences were obtained between insecticide-treated and control okra plots. The study showed that Levo was as effective as Lambda super and can be recommended as a substitute in the management of insect pests of eggplant and okra.
A Thesis Submitted to the Department of Crop and Soil Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana In Partial Fulfillment of the Requirement for the Degree Of Masters of Philosophy in Crop Protection (Entomology).