Aerial Spray Tests on Adult Salt-Marsh Mosquitoes Resistant to DDT1

Publisher Website
Google Scholar
Abstract
Observations in the Cocoa Beach area of Brevard Co., Fla., indicated that aerial application of DDT at the rate of 0.2 lb./acre was not giving as good control of Aedes taeniorhynchus and A. sollicitans as in previous years. The belief that the mosquitoes in this area, after several years of intensive treatment, had developed some degree of resistance to DDT, was confirmed by laboratory tests. Airplane spray tests were carried out to evaluate the effectiveness of lindane, technical benzene hexachloride (12% gamma isomer), toxaphene, parathion, chlordane, and dieldrin against adult mosquitoes. DDT and chlordane gave variable results and neither material was highly effective in most tests at dosages of 0.2 and 0.3 lb./acre. A 0.6-lb. dosage of chlordane showed excellent results at the 6-hour count, but the reduction was only 79 to 88% after 24 hours. Lindane was the most effective, and gave good-control of both A. sollicitans in open areas and A. taeniorhynchus in woods at 0.1 lb. per acre. Technical benzene hexachloride at 0.2 and 0.41b./acre gave results comparable to lindane at 0.05 and 0.1 lb. per acre on the open marshes, but was less effective in the woods. The results with dieldrin at 0.1 and 0.05 lb./acre were not quite so good as with lindane. Parathion was effective against A. sollicitans at dosages of 0.1 and 0.05 lb., but was less effective against A. taeniorhynchus in the woods. Toxaphene appeared less effective than DDT.

This publication has 0 references indexed in Scilit: