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Larvadex 0.3% premix (cyromazine), an insect growth inhibitor, was fed to 17 White Rock hens (37 wk old) at the University poultry farm to determine its effectiveness in controlling northern fowl mites. Seventeen birds served as controls. All birds were housed individually in a 7.3 X 7.3-m shelter. The shelter contained 2 banks of Favorite single deck, double row, sloping floor hanging cages (46 X 46 X 30 cm), 20 cages per bank. Cage banks were separated by a 2.3-m isle and were suspended 1 m above the floor. Treated and control birds were housed in separate banks. On 18 Feb ‘83 all birds were artificially infested with northern fowl mites by mechanically aspirating mites from carrier hens and releasing them into the vent area of each recipient. Mite populations were visually estimated by parting the feathers in the vent area at two-wk postinfestation and at weekly intervals for the duration of the study. Population levels were indexed by the following code: 0 = 0 mites/bird; 1 = 1-2 mites; 2 = 3-9 mites; 3 = 10-31 mites; 4 = 32-99 mites; 5 = 100-315 mites; 6 = 316-999 mites; 7 = 1,000-3,159 mites; 8 = 3,160-9,999 mites; 9 = 10,000-31,586 mites; and 10 = more than 31,586 mites/bird. Larvadex treatments were initiated on 4 Mar ‘83 and continued for 15 consecutive wks.

Evaluation of Larvadex® for the Control of Northern Fowl Mites on Chickens, 1983