. Sanitary entomology; the entomology of disease, hygiene and sanitation. istributed American dog tick whichis sometimes sufficiently abundant to greatly annoy man and other of these species except the tropical horse tick, drop for their molts andare therefore rather difficult to control. Dipping in arscnicals, especiallyif carried out at weekly intervals, will of course reduce their numbersconsiderably. In regions where dipping vats are not generally available,hand picking or the application of kerosene emulsion, some of the creo-sote stock dips, or arsenical dips with a rag or sp
. Sanitary entomology; the entomology of disease, hygiene and sanitation. istributed American dog tick whichis sometimes sufficiently abundant to greatly annoy man and other of these species except the tropical horse tick, drop for their molts andare therefore rather difficult to control. Dipping in arscnicals, especiallyif carried out at weekly intervals, will of course reduce their numbersconsiderably. In regions where dipping vats are not generally available,hand picking or the application of kerosene emulsion, some of the creo-sote stock dips, or arsenical dips with a rag or spray pump are treatment of dogs should receive special attention. The tropical CONTROL OF TICKS 447 horse tick requires local treatment similar to that for the spinose eartick. South African Ticks.—In South Africa the so-called blue tick, avariety of our common cattle tick, carries bovine piroplasmosis and prob-ably other diseases and may be controlled by the same procedure outlinedfor our species. However, in South Africa this is not considered the most. Plate XXVIII.—Spraying chicken house with oil by means of knapsack spray pump. (Bishopp). important tick parasite of live stock, since certain species of Rhipiceph-alus carry the much more deadly disease, East Coast fever. Since theinnnature stages of the brown tick (R. appendiculatus), the principalagent in the dissemination of the disease, become engorged and leavetlie host in three days or less, it becomes necessary to dip at very shortintervals to prevent the escape of specimens which may infect otheranimals. The larvae or nymphs which engorge on cattle infected withEast Coast fever are the only direct source of propagation of the diseasein otlier animals, hence the main attack must be directed against them. 448 SANITARY ENTOMOLOGY Watkins-Pitchford found that these stages can be killed with dip muchweaker than is necessary to destroy the adults. He thus determined on astrength which would destroy these yo
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbenefic, bookyear1921
