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Studies on the Concentration and Distribution of Paris-Green-Lime Mixtures Applied as Anopheline Larvicides¹

Since the discovery by Barber and Hayne (1921) of the lethal effects of Paris green upon anopheline larvae, most of the quantitative studies made in this country on the distribution of dust particles have been in connection with aeroplane dusting (King and Bradley, 1926; Williams and Cook, 1927; Le Prince, et al., 1927; Watson, 1936, and Kiker, Fairer, and Flanary, 1938). Observations on the larvicidal efficiency of various brands of Paris green, used in different proportions with diverse diluents and discharged laterally from power or hand-dusters were reported by Gill, Kiker and Sims (1929) and Le Prince and Johnson (1929). The use of such ground equipment is relatively common in the Southern states, yet, with the exception of the last-mentioned papers little has been done to explore its limitations. A considerable literature exists on the use of these dusters in orchard and crop dusting but the objectives and circumstances of this type of dusting vary so from those of anti-mosquito applications that its significance in malaria control considerations is restricted.

Received June 13, 1941.
¹ Contribution No. 4 from the Division of Malaria and Hookworm Service, Georgia Department of Public Health, Atlanta, Georgia. Read before the National Malaria Committee and American Society of Tropical Medicine, November 15, 1940, in Louisville, Kentucky.