Laboratory and Field Evaluation of Controlled Release Dispensers Containing Grandlure, the Pheromone of the Boll Weevil (Coleoptera: Curculionidae)1

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Dispensers containing the aggregation pheromone grand lure are extensively used in traps for detecting, monitoring, and suppressing the boll weevil, Anthonomus grandis Boheman, in areawide management programs and for monitoring on a field-by-field basis. The effective period of pheromone release from these dispensers is substantially influenced by the nature of the dispenser formulation and by temperature and other variables. A laboratory procedure was developed to measure the relative release rates of grand lure from candidate dispensing systems under conditions of constant temperature and air flow. Release rates were found to increase by as much as 13 times as the temperature was raised from 28 to 62. Field studies were conducted on 12dispenser formulations to measure insect capture as a function of dispenser aging time over 3-wk periods; emission rates and residual grand lure contents were measured on similarly aged dispensers. A laminate with 400-m outer layers and the cigarette filter gave the best overall performance. Laboratory-measured release rates correlated with boll weevil captures (Test 1; linear regression analysis with r2 = 0.83). Accelerated aging of dispensers in an oven set at 54 gave similar profiles of release rate versus time as did the field-aged dispensers; relative performance of dispenser formulations can be determined in the laboratory as a preliminary evaluation before costly and lengthy field tests are undertaken.

Document Type: Research Article

Publication date: June 1, 1988

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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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