Interactions Between Winter Annual Weeds and Egyptian Alfalfa Weevil (Coleoptera: Curculionidae) in Alfalfa
Authors: Norris, R. F.; Cothran, W. R.; Burton, V. E.
Source: Journal of Economic Entomology, Volume 77, Number 1, February 1984 , pp. 43-52(10)
Publisher: Entomological Society of America
Abstract:Removal of winter annual weeds which invade California alfalfa (Medicago sativa L.) during the wet, mild winter increased the number of larvae of Hypera brunneipenis Bohman, collected using a standard California sweep-net. The magnitude of the increase in larval numbers when weeds were removed ranged from no effect to over 5-fold; increases in the range of 1.2- to 1.5-fold were typical. The type of herbicide used to remove the weeds did not alter the magnitude of the response, which was therefore attributed to changes in the vegetation rather than to direct effects of the herbicides. Combined weed competition and weevil feeding caused the greatest losses in alfalfa yield, but the relative constant from site to site. Weevil damage exceeded that due to competition in some fields, but weed competition caused greater losses than weevil feeding in other fields. These results have considerable significance to integrated pest management programs, because they indicate that threshold densities for H. brunneipenis vary in relation to the presence or absence of weeds, and that the relative importance of weeds and H. brunneipenis is very site dependent.
Document Type: Research Article
Publication date: 1984-02-01
- 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.
- Editorial Board
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Visit this journal's homepage
- ingentaconnect is not responsible for the content or availability of external websites