Economic Injury Level for the Banks Grass Mite (Acari: Tetranychidae) on Corn

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Banks grass mite, Oligonychus pratensis (Banks), feeding on corn, Zea mays L., between the late-vegetative and dent growth stages caused significant yield loss but did not affect test weights. Regression analysis was used to compare several independent variables (mite abundance, damage ratings, and percentage of the leaves infested) with yield loss and plant lodging. Data were analyzed the week of maximum yield loss from mite feeding at predetermined damage levels and the week before this event. The best relationship was between yield reduction and percentage of the leaves infested the week before maximum yield loss from mite feeding occurred. There was a 0.2% yield loss per 1% infested leaves per plant. A flexible economic threshold for Banks grass mite on corn can now be calculated based on crop value and cost of control. Mite feeding on corn in the dent growth stage did not affect yield. Banks grass mite feeding did not have a definitive effect on incidence of plant lodging, although there were indications that increased lodging may have been associated with mite feeding in some situations. Grain moisture declined as densities and feeding damage by Banks grass mite increased.

Document Type: Research Article

Publication date: June 1, 1990

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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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