Sampling Methods Used to Determine the Prevalence of Mansonia perturbans During the Evening Peak Period1

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Abstract:

Observations on the prevalence of Mansonia perturbans (Walk.) were made during the evening crepuscular period in a pastured lowland at Beaverdam Swamp, Greenbrier, Alabama, in the summer of 1957. A 15-minute exposure period below 0.9 ft.-c. was used as standard.

Four methods of capture about man were utilized in an attempt to estimate attacking and non-attacking portions of the immediate mosquito population. In three of the methods captures of mosquitoes were made on the body and clothing of the collector by aspirator in conjunction with supplemental trapping devices including drop net, aerial net, and parked car to account for the resting and hovering remainder at the end of the period. In the fourth method intermittent aerial net sweeping was used.

A drop net device was developed consisting of three 7-foot legs connected by spacing rods at the base and supporting a circular ΒΌ-inch iron pipe frame 43 inches in diameter with a trigger mechanism inside and with a folding doth net 7 feet 4 inches long and 44 inches in diameter set outside and above. The net was hemmed to 8 44-inch iron ring at the open end to provide an abrupt and even descent when the device was triggered.

In all, 141 male and 5,637female M. pertubans were recorded in the nine tests from June 4 to July 10, inclusive. The males were distributed as follows: intermittent aerial sweeping, 109 (77.0%); aspirating in open with 10 terminal aerial sweeps, 22 (16.0%); and aspirating under net plus drop net catch and parked car technique each with .5(3.5%).The 5,637 females collected in the four methods were represented as follows: aspirating under net plus drop net catch, 2,422 (43.0%); parked car technique, 1,242 (22.0%); intermittent aerial sweeping, 1,041 (18.5%); and aspirating in open plus 10 terminal aerial sweeps, 932 (16.5%).

The aspirator plus drop net and parked car technique recorded the highest numbers of females largely by providing combinable resting surfaces for mosquitoes deactivated in the proximity of the collector during the exposure period. The method employing 10 aerial sweeps at the end of the period gave the nearest estimate of the hovering remainder: however, the numbers varied greatly and appeared to reflect existing weather conditions more than population density. Intermittent net sweeping gave the best indication of males in flight and yielded useful background information on female flight activity when biting records were low. On moonlight nights approaching second quarter phase or full moon female mosquitoes freely entered the parked car. This was also true on cooler evenings in the alunar period.

Document Type: Research Article

Publication date: June 1, 1958

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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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