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Mating and Oviposition of the Cabbage Looper1 in the Laboratory2

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Mating of the cabbage looper, Trichoplusia ni (Hübner) , occurred infrequently in the laboratory at temperatures below 15.6°C. Light:dark cycles of 14:10, 10:14, or 18:6 hours apparently did not affect frequency of mating, but the cyclic rhythm could be altered by rescheduling the cycles. Cold treatment (10°C), carbon dioxide, or ether used as anesthetic agents decreased mating 4,58, and 84%, respectively, if the moths were exposed for 10 min and then paired for 24 hours. Recovery from 10 minutes of exposure to cold treatment or ether occurred within 48 hours. Twenty minutes of exposure to carbon dioxide or ether reduced mating for 48 hours. Cage size and type (carton and 8-mesh wire screen) did not affect mating when 1-5 pairs per cage were used. However, mating in- creased from 35 to 8370 when the male: female ratio was increased from 0.25 to 4. Male cabbage looper moths mated infrequently the 1st night after emergence and most frequently the 3rd and 4th nights after emergence when they were paired with receptive females. Females mated the 1st night after emergence but more consistently thereafter. when moth pairs were held at temperatures below 15.6°C, few or no eggs were laid. However, the viability and the total number of eggs laid when the moths were held at all temperatures between 15.6° and 32.2°C were comparable. Longevity of moths held at 10°C increased greatly over that of moths held at 4.4°, 15.6°, 21.1°, 26.7°, or 32.2°C; at 10°C 92% of each sex were living after 30 days.

Document Type: Research Article

Publication date: June 1, 1967

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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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