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Biology, seasonal activity of fruit fly (Bactrocera cucurbitae Coq.) on pointed gourd (Trichosanthes dioica Roxb.) and weather relations

P. Barma and S. Jha

Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, India


Bactrocera cucurbitae (Coq.) is considered as a serious pest of pointed gourd. Peak incidence of it was obtained in third week of May to first week of June during all the three years of study (i.e. 2007-08, 2008-09, 2009-10). Studies on biology showed that the incubation, larval, pupal and adult longevity periods were 2 to 5 days, 5 to 7 days, 6 to 9 days, 37 to 41 days in June-July and 4 to 6 days, 16 to 19 days, 17 to 21 days, 23 to 32 days in August-October, respectively. Correlation with individual weather factors revealed that each of maximum and minimum temperature had significant positive correlation (r = +0.386 and +0.501, respectively) on the population build up of the pest. The relative humidity % of morning hours had significantly negative correlation (r = -0.451) and that of evening slightly positive (r = +0.284). Rainfall had insignificantly positive (r = +0.195), soil temperature significantly positive (r = +0.555) and the bright sun shine hours insignificantly positive (r = +0.103) effects on the population development


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The Journal of Plant Protection Sciences


Vol. 7, Iss. 1-2, Pages 1-18


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