Screening of round gourd varieties for resistance against fruit fly, Bactrocera cucurbitae (Coquillett)

Abstract

The investigations on the “Screening of round gourd varieties for resistance against fruit fly, Bactrocera cucurbitae (Coquillett)ˮ were carried out at Horticultural farm of SKN college of agriculture, Jobner, Jaipur during Summer, 2016. Out of seven varieties of round gourd screened against the fruit fly, Arka Tinda and Tinda Ludhiana (12.20, 13.98 and 12.13, 13.92% fruit infestation on number and weigh basis, respectively) were found less susceptible, Mahi Tinda, Mahi-1 and Amol (16.67,18.78, 20.31 and 16.07, 17.98, 19.87% fruit infestation on number and weigh basis, respectively) as moderately susceptible and Ujjawal and JKSPL (23.37, 22.05 and 22.20, 22.07% fruit infestation on number and weigh basis, respectively) as highly susceptible. In the physical characters viz., hair density and tenderness of fruit rind, varieties having hard rind of fruits were less susceptible. The variety having densely hairy was found less susceptible and less hairy varieties were found susceptible against fruit fly infestation, whereas, the shape and colour of fruits has not affect the susceptibility. The biochemical parameters viz: total phenol and silica content had negative correlation while, total soluble solids had positive correlation with fruit fly infestation.