تأثير الاشعة فوق البنفسجية في بيض حشرات عثة التين Ephestia cautella, عثة الحبوب Sitotroga cerealella و خنفساء اللوبياء الجنوبية Callosobruchus maculatus

Abstract

The study was conducted to study the effect of ultraviolet radiation on eggs development of three stored insect pests , Callosobruchus maculates , (Coleoptera : Bruchidae ) , Ephestia cautella (Lepidoptera : Pyralidae ) and Sitotroga cerealella (Lepidoptera : Gellichidae ) through exposing the eggs at three age groups : 1 , 2 and 3 days old, the wavelength of ultraviolet radiation was 312 nm which exposed for different durations : 5,10 and 15 minutes to determine the effects on egg hatching and percent of egg lied reduction . The highest reduction in percent of an egg – hatching was: 98.8% and 97.7% for E. cautella and S.cerealella respectively for two days egg old and for the longest exposure period which was 15 min. while Callosobruchus maculatus eggs appeared to be highly resistance to U.V. radiation for all tested ages and exposing periods.