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Asian Journal of Plant Sciences

Year: 2007 | Volume: 6 | Issue: 6 | Page No.: 920-926
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Authors

Bhai Khan Solangi

Mohammad Khan Lohar

Keywords

Research Article

Effect of Some Insecticides on the Population of Insect Pests and Predators on Okra

Bhai Khan Solangi and Mohammad Khan Lohar
A field study was carried out to determine the efficacy of different insecticides against different insect pests and their predators on okra crop during the year 2005. The treatments included four insecticides i.e., Confidor, Sundaphos, Polo and Mospilan and their efficacy was checked by a control plot (unsprayed). Pre-treatments population of the jassid, thrips, whitefly, mites, spiders, ants and beetles was managed and post treatments observations were recorded after 24, 48, 72 h, 7 and 14 days of insecticidal spray. The results showed that in controlling jassid, all the insecticides were significantly (p<0.01) effective but Confidor proved to be more effective as compared to Sundaphos, Polo and Mospilan, where jassid mean population was 1.20 plant-1 as compared to pre-treatment population of 7.78 plant-1, thrips 1.16 plant-1 as compared to pre-treatment population of 6.52 plant-1, whitefly 1.18 plant-1 as compared to pre-treatment population of 8.31 plant-1, mites controlled to the level of 2.42 plant-1 as compared 8.56 plant-1 (control). All the insecticides were almost equal in effects on the spiders and the mean spider population was 0.31, 0.30, 0.31, 0.38 plant-1 in plots sprayed with Confidor, Sundaphos, Polo and Mospilan, respectively and similar was the situation with population of ants where mean population was 0.33, 0.38, 0.35 and 0.35 plant-1 in plots sprayed with Confidor, Sundaphos, Polo and Mospilan, respectively. The insecticides sprayed all were harmful for the beetles and the mean population of beetles was 0.03, 0.06, 0.03 and 0.07 plant-1 in plots sprayed with Confidor, Sundaphos, Polo and Mospilan, respectively. However, Confidor and Polo were more harmful to beetles as compared to Sundaphos and Mospilan. All the insecticides were effective against jassid, thrips, whitefly and mites, but Confidor proved to be most effective equally against all the insect pests under study as compared to Sundaphos, Polo and Mospilan. Confidor also proved better than other insecticides, because the population of predators i.e., spiders, ants and beetles was less affected by Confidor application as compared to Sundaphos, Polo and Mospilan.
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