Efficacy of Datura and Neem Leaf Extracts for Control of Aphid (Aphis gossypii) in Okra
This study was conducted during November 2019 at the National Institute for Promotion of Horticultural Exports, University of Gezira, research farm to evaluate the efficacy of natural products of datura and neem leaf extracts against aphid (Aphis gossypii) in okra (the exported cultivar PusaSwani). The randomized complete block design (RCBD) was used with three replications to conduct the experiments. Four leaf extracts were used; Ethanloicdatura leaf extract, aqueous datura leaf extract, ethanolic neem leaf extract and aqueous neem leaf extract. The extracts were prepared and applied at a rate of 5 gm/L. The chloropyrifos 480 EC was used at a rate of 3.6 gm/L as standard check. Three sprays were applied at ten days intervals. Pre and post counts were carried out and means number of aphid/leaf were recorded and subjected to analysis of variance and mean separations. Application of the organophosphoruschloropyrifos insecticide at a rate of 3.6 gm/L resulted in reducing the population of the aphid from 1.3 to 1.2 aphid/leaf in pre and post count spray respectively and it seems to be the most effective compared to other tested products. Application of the aqueous neem leaf extracts at rate of 5 gm/L succeeded in reducing the population from 1.5 to 1.4 aphid/leaf in the pre and post count spray, and it is the only natural products extracts that gave a positive response. Application of Ethanloic neem leaf extract at a rate of 5 gm/L succeeded in holding the population of the aphid constant at 1.6 aphid/leaf in the pre and post count spray, while application of both Datura extracts at a rate of 5 gm/L has no effects on aphid population.
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