Abstract
Thirteen bitter gourd germplasm per cultivars (Col-II, FSD-long, Col-Nankana sahib, Col-I, GS-51, Col-Ill, Col-Multan, Col-Vehari, Chaman, Sunder-F1, Janpuri, F1-484 & F1-485) were screened for sources of resistance against melon fruit fly in Pakistan. Results revealed that the percent fruit-infestation and larval density per fruit varied significantly in all tested bitter gourd genotypes. Based on the considered criteria i.e., percent fruit infestation (<20%) and larval density per fruit (3 larvae fruit(-1)), Col-II and FSD-Iong were categorized as resistant genotypes. Col-Nankana sahib, Col-I and GS-51 showed >20% but <50% fruit infestation and >3 but <6 larvae per fruit were categorized as moderately resistant genotypes. Col-Ill, Col-Multan, Col-Vehari, Chaman, Sunder-F1, Janpuri, F1-484 and F1-485, with >50% but <80% fruit-infestation and >6 but <10 larvae per fruit were categorized as susceptible genotypes. It was concluded that Col-II and FSD-Iong can be used as a source of resistance for developing bitter gourd genotypes resistant to melon fruit flies.