Abstract
Parasitism of European corn borer, Ostrinia nubilalis (Hubner), larvae by Lixophaga diatraeae (Townsend) in the early 3rd, 4th, and 5th instars resulted in a significant reduction in the amount of food consumed, frass weight, weight gained, and length of feeding period. The approximate digestibility was significantly greater for parasitized larvae of all three instars fed an artificial diet. Efficiency of conversion of ingested food to body substance was higher in unparasitized than parasitized larvae of the 4th and 5th instars. Efficiency of conversion of digested food to body substance was higher in unparasitized larvae of all three instars. The effects of L. diatraeae on O. nubilalis , an unnatural host, are very similar to the effects of this parasite on its natural host, Diatraea saccharalis .
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