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Interactions of Alfalfa Weevil (Coleoptera: Curculionidae) and Weeds in Reducing Yield and Stand of Alfalfa

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Interaction of alfalfa weevil, Hypera postica (Gyllenhal), and weeds in reducing forage production and stand longevity over several years was studied. Insecticide (carbofuran) and herbicides (terbacil and oryzalin) were used to control naturally occurring weevil and weed populations in some plots, in others pesticides were not applied, resulting in four treatment combinations. Seasonal alfalfa yield reductions (as compared with the pest free treatment) averaged 2.0 Mg/ha in the weevil infested treatment, 0.4 Mg/ha in the weed infested treatment, and 3.7 Mg/ha when both pest types occurred. Virtual loss of the alfalfa stand occurred in 2–4 yr due to combined pest infestations, resulting in <10.0 stems/0.1 m2 as compared with 18 stems in the pest-free treatment. Combined effects of H. postica larval feeding damage and weed competition on alfalfa forage yield and stand retention were greater than the sum of the effects of pests occurring individually.

Document Type: Research Article

Publication date: December 1, 1987

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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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