Patterns of feeding and mortality of adult European corn borer (Lepidoptera : Crambidae) in the laboratory

I studied the diurnal and ontological patterns of feeding by European corn borer adults, Ostrinia nubilalis (Hubner), and characterized the effect of feeding on adult mortality in the laboratory. Adults were provided a sucros e diet and water ad libitum, and were observed at periodic intervals to est imate the proportion feeding on sucrose or water. Dead adults were counted daily to estimate mortality. Adults preferred to feed on the sucrose diet d uring the first Meek of life, but not thereafter. Feeding occurred mainly j ust after the lights were turned off but also just after lights were turned on, and this time preference also waned by the second Meek of life. Daily mortality rates increased during adult life. These results are consistent w ith other studies on adult mortality, and suggest that feeding on sugar may be beneficial for adults only when their life expectancy exceeds 4 d.