Influence of temperature on the speed of development of melon-fly, Dacus cucurbitae Coquillett (Diptera: Trypetidae)

Bhatia, S.K.; Mahto, Y.

Indian Journal of Agricultural Sciences 40(9): 821-828


ISSN/ISBN: 0019-5022
Accession: 000118107

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It was found in the course of laboratory investigations in Madhya Pradesh that the average durations of the egg, larval and pupal stages of Dacus cucurbitae Coq. ranged from 51.17 h, 9.94 days and 24.23 days, respectively, at a constant temperature of 15 deg C to 20.42 h, 3.90 days and 7.75 days at 30 deg C. At 10 and 40 deg C, no hatching or development and at 35 deg C no pupal development took place. The duration of development averaged 36.30, 23.60, 12.61, 11.17 and 12.50 days at 15, 20, 25, 27.5 and 30 deg C, respectively. At the optimum temperature of 27.5 deg C, 76.9% of the eggs hatched, 83.3% of the larvae pupated and 92.9% of the pupae gave rise to adults. It was found that the developmental data fitted an equation derived by S. Pradhan, corresponding to a sigmoid curve.