Extensive tests were conducted in 1953 b y the Orlando, Fla., laboratory of the Bureau of Entomology and Plant Quarantine to evaluate the effectiveness of dry sugar baits for the control of houseflies resistant to DDT and other chlorinated hydrocarbon insecticides. In laboratory tests sugar baits containing only 0.1% of malathion, Diazinon, or Bayer L 13/59 gave 99% kills of flies in 16 hours. Higher concentrations gave faster kills.In practical tests in open dairy barns and poultry houses applications of 100 grams of the bait per 2500 to 5000 square feet of floor area usually gave reductions of 90% or higher within 4 hours. Five applications per week of baits containing 0.5 and 1.0% of the toxicants maintained highly effective control of flies under adverse conditions. As flies feed on individual grains of sugar, the bait can be scattered so sparsely that animals would b e unlikely to eat much of it. The bait is inexpensive, easily prepared, and easily applied from a jar with holes in the lid.
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