Two kinds of test were made to make sure of the effects of carbamate(2-sec-buthyl-phenyl-N-methylcarbamate) on ticks(nymph of Haemaphysalis bispinosa NEUMlMAN) which carry piroplasmosis of cattle, at Koyahara pasture in Sambe, Shimane Prefecture, in early Summer 1971.
In Test 1, three kinds of carbamate emulsion(0.1%, 0.5% and 1.0% in concentration) were applied to the skin of cattle. After 24 hours, the number of ticks on the cattle treated with carbamate grew much fewer than those on untreated cattle, but after 7 days, there was no difference in number of ticks between treated and untreated.
Test 2 was to make certain of the after-effect of carbamate. The emulsion(0.05%, 0.1% and 0.5%) was directly tested on ticks. The after-effect of it was recognized during twenty days at least after carbamate was prepared, and the mortality of ticks by carbamate was 100 per cent in this test.