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International Research Journal of Plant Science

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Influence of abiotic factors on population development of Bemisia tabaci infesting Abelmoschus esculentus

Abstract

Hakim Ali Sahito1, Ghulam Hussain Abro2, Shafique Ahmed Memon3, Bhugro Mal4 and Riaz Mahmood5

The experiment was carried out in the Experimental Field, Model Farm, CABI, South Asia, unit Mirpur Khas, Sindh during spring season 2011. Okra variety Sabzpari was shown on 10th, 28th February and 20th March 2011. Weekly observations were taken on Bemisia tabaci population. Meteorological record was obtained from Meteorological Record Center, Sindh Horticulture Research Institute, Mirpur Khas.The results showed that the crop sown on 10th February had one population peak of whitefly (5.00 ?± 0.75 per leaf). The fluctuation in the population of whitefly was observed throughout cropping season on okra sown on 28th February. Two peaks in population were recorded i.e. 1st peak (6.04 ?± 0.62, whitefly per leaf) in 4th week of March and 2nd peak (7.72 ?± 1.08) in 3rd week of April. The okra crop sown on 20th March showed three population peaks of whitefly i.e. (7.42 ?± 0.94 per leaf in 2nd week of April), (8.46 ?± 1.04 in 1st week of May) and (5.98 ?± 1.01 in the end of 2nd week of June). The overall mean populations record were 1.76 ?± 0.31, 2.73 ?± 0.55 and 3.37 ?± 0.61 on the crops sown on 10th, 28th February and 20th March, respectively. The regression analysis showed significant negative correlation of whitefly population with temperature 0C and relative humidity percent.

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