Beet Armyworm (Lepidoptera: Noctuidae) Behavior and Effects on Insecticide Efficacy in Open and Closed Cotton Flowers and Boll Abscission or Damage from Flower Infestation

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Severe natural infestations of the beet armyworm, Spodoptera exigua (Hübner), in upland cotton, Gossypium hirsutum L., result in flower infestations as well as foliage infestations. Conventional insecticide applications did not control beet armyworms in the flowers when applications were applied in early morning before the flowers opened. This problem was remedied by delaying applications until flowers opened before initiating insecticidal control. Two tests were conducted to determine the validity of the observation. In both tests, insecticidal control was ≥96% when flowers were open and ≤12% control when flowers were closed. In a 3rd test, flowers were infested with beet armyworm larvae to determine if that would inhibit boll development or increase boll abscission. Seven days after the infestation, there was a significant reduction in bolls developed from infested flowers compared with that in bolls from non infested flowers.

Document Type: Research Article

Publication date: February 1, 1998

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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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