Studies of Mosquito and Other Biting-Insect Problems in Alaska

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Abstract
Extensive studies were made in 1947 and 1948 on mosquito and black fly (Simuliidae) larvae and adults and Culicoides adults in several sections of Alaska. Prehatching treatments for the control of Aedes larvae were effective only on some marshes. DDT, the most promising material tested, was more effective in fuel-oil solns. and in emulsions than in dusts. No difference was noted between fall and spring treatments. In conventional larvi-cide applications TDE, parathion, and methoxychlor were about as effective as DDT. Treatment of a 30-sq.-mile plot did not prevent infiltration of adults from surrounding areas. Plots of 24 to 30 sq. miles sprayed by air for the control of adult mosquitoes required re-treatment every 7-10 days. A dosage of 01 lb. of DDT per acre appeared to be adequate. DDT, TDE and methoxychlor were about equal in effectiveness against black fly larvae and were superior to benzene hexachloride, chlordane, and toxaphene. The 4 standard repellents and n-propyl N,N-diethyl-succinamate were best for skin application and n-hexyl mandelate for impregnation of clothing. DDT caused no damage to fish or fish foods at 30 to 60 ppm.

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