Evaluation of the Effectiveness of Cold-Water Misting of Trees in Seed Orchards for Control of Douglas-fir Cone Gall Midge (Diptera: Cecidomyiidae)

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Abstract:

Misting of trees with cold water for delaying reproductive bud burst was evaluated as a control method for Contarinia oregonensis Foote. This method reduced damage to the same degree as was achieved with the insecticide dimethoate when a 10-day delay in seed-cone bud burst coincided with the earliest "flowering" trees being the most heavily attacked. Gall midge damage was not reduced to an acceptable level with less than a 10-day delay or when later-flowering trees were the most heavily attacked. It is not possible to determine the likely effectiveness of cold-water misting before bud burst in a given year, because the period of bud burst delay varies with weather and because synchrony between presence of adult midges and susceptible host stage is not consistent.

Document Type: Research Article

Publication date: August 1, 1983

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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