Abstract
Abstract A commercial area repellent (Mosquito Beater), 2 experimental area repellents (1- and 2- methylnaphthalene) and a control (carrier only) were tested against riceland mosquitoes in Colusa County, Calif, on 31 Jul, 11 and 13 Sep, and 2, 3, 4, 16 and 17 Oct. Materials were tested at 8 stations established at 50 m intervals on a 750 m transect along a landing strip for crop dusting aircraft. Approximately 1.5 h before sunset each day the treatments were applied in random order to 20 m diam test areas at stations 1-4 and 5-8 (2 replications) and 7.1 lb (AI)/ acre (carrier only at control station) with a Seymour No. 75 Universal Spreader. Beginning 0.5 h before sunset each day a carbon dioxide-baited mosquito light trap was operated at the center of each test area for approximately 2 h. Four BioQuip Co2 Mosquito Traps equipped with "grain of wheat" lamps were operated at stations 1-4, and either 4 BioQuip traps or 4 carbon dioxide-supplemented CDC Model Miniature Light Traps were operated at stations 5-8. Female mosquitoes collected each night were sorted, identified, and counted in the laboratory. Data were analyzed separately by species as a 2-way (treatments × replications) analysis of variance using the log (x − 1) transformation. Replications in which the species was not collected were excluded from the analysis.
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