Seasonal Changes in Daily Activity Periods of the Sweetclover Weevil1,2

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Daily activity of adult sweetclover weevils, Sitona cylindricollis Fahraeus, was determined throughout 3 consecutive growing seasons at Lincoln, Nebraska. In 2 of the 3 years adults were found most frequently on early spring sweetclover foliage during the day. By mid July in all 3 years, weevils were most numerous on the foliage after dark and almost absent during daylight. In all years weevil activity was low in late summer; but by fall, more weevils were found on the plants at night though activity was not as restricted to this period as during July. The major influence on activity appeared to be light; at the secondary influence was temperature. Activity seemed to be highest at night unless low temperatures caused the insects to shift their activity to the warmer daylight hours, which may explain the daylight activity in spring and fall, when nighttime temperatures tend to fall below the threshold for weevil activity.

Document Type: Research Article

Publication date: April 1, 1968

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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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