Interaction of Alfalfa Weevil (Coleoptera: Curculionidae), Weeds, and Fall Harvest Options as Determinants of Alfalfa Productivity

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The objective of this study was to determine the effects of late fall cutting and winter grazing in combination with alfalfa weevil and weed control on alfalfa forage yield, quality, and stand longevity of three alfalfa cultivars having varying degrees of pest resistance. Although most comparisons of total forage and alfalfa yields showed no significant differences among harvest treatments, yield at first cut was significantly reduced by winter grazing in the first year and was reduced by fall cutting in the fourth year. Yield totals for the 5-yr study showed no significant differences among harvest treatments. Fall cutting and winter grazing had no Significant effect on stand persistence after 5 yr relative to alfalfa left unharvested through winter. Weed and alfalfa weevil infestations reduced alfalfa yields up to 2.4 Mg/ha/yr and accelerated stand decline. Control of weeds and alfalfa weevils allowed stands of improved ‘WL 318’ to remain productive for up to 6 yr. Forage production and stand retention of the unimproved ‘OK08’ were comparable with the other cultivars for the first 3 yr but declined rapidly in the last 2 yr because of extensive weed interference.

Document Type: Research Article

Publication date: August 1, 1993

More about this publication?
  • 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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