Egg Parasitism and Larval Habits of the Orange-Striped Oakworm1

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Parasitism by Trichoramma and Tetrastichus of orangestriped oakworm (Anisota senatoria (J. E. Smith)) eggs varied from an average of 22.9% to 74.4% 111 various areas of Connecticut. The effect of these parasites was greater, however, than a mere count of their numbers showed. Gregarious early instar orange-striped oakworm larvae arc less able to survive if their numbers are reduced. Laboratory tests over a .5-week period showed that 72.7% of the total mortality of these oakworms reared singly occurred in the first week as contrasted with 5% of the total mortality occurring in the first week when 16 larvae were reared together.

Some oakworm egg masses in the field were nearly 100% parasitized. When parasitism reduced the number of viable eggs, the first-instar larvae were less able to survive because reduced numbers affected their ability to move and feed.

Document Type: Research Article

Publication date: June 1, 1961

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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