Abstract
The northern fowl mite, Ornithonyssus sylviarum (C. & F.), on hens in community wire cages was controlled effectively by putting a dust-bath-box (18×12×6 inches deep) charged with 5 pounds of 4% malathion dust in a cage for 14 days. The hens were free of mites for 6 weeks thereafter. In comparison the control program of the ranch consisted of a general spray application each 30 days. The results suggested adaptation of the method to a program of spot-treating only the cages where mites were found on the eggs. Data on the percentages of cages requiring spot-treatment each week for a period of 47 weeks are discussed. The evidence offers several reasons to recommend spot-treatment with dust-bath-boxes charged with 4% malathion dust as It method of choice for controlling the northern fowl mite on chickens in community wire cages. Additional trials conducted to determine dosage efficiency showed that 1 pound of 4% malathion dust per box per 30 hens was optimum for mite control. In these trials reducing the depth of the box to 3 inches improved its acceptance by the hens and eliminated any problem of eggs laid in the dust-bath-box.
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