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The Horn Fly.1 1. Seasonal Incidence of Diapause in Mississippi2•3

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A 3-year study of overwintering of Haematobia irritans (L.) , initiated in 1966, indicated that October was the principal time for the development of diapausing individuals. Token numbers also were produced during September and November of each year. The last day suitable for fall adult emergence was Nov. 17, 16, and 14, respectively, for each year of the study. Adult flies were found on pastured cattle as late as Dec. 8, 1966 and 1967, and on Dec. 7, 1968, in the area of State College, Miss. The population entering diapause was the largest during 1966 in comparison with the following 2 years. Diapausing individuals were able to develop in the Held for a period of 62, 64, 49 days, respectively, for each testing season. Percentages of the sampled population entering diapause at each caging date were established. Diapause was found to be facultative, and adult emergence ceased in the field when temperatures dropped below 60°F. The 1st spring emergence occurred in March during 1967 and 1968 but was delayed until early April in 1969.

Document Type: Research Article

Publication date: February 1, 1971

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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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