Abstract
The naturally occurring mortality of eggs and larvae of second-generation southwestern corn borer, Diatraea grandiosella (Dyar), in Kansas irrigated field corn, Zea mays L., was investigated. During 1983, corn plants in the study plots averaged 35.4 southwestern corn borer eggs per plant. Egg mortality was 33.2%; egg through third larval stage mortality was 86.2%; and 96.8% mortality occurred from egg through large larval stages. During 1984, plants in the study plots averaged 6.1 eggs per plant. Egg stage mortality was 32.6%; egg through third larval stage mortality was 87.2%; and 87.2% mortality occurred from egg through large larval stages. Trichogramma pretiosum (Riley) was the most significant factor contributing to egg mortality, accounting for 21.9% of total mortality in 1983 and 28.2% of total mortality in 1984.
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