64 



OHIO EXPERIMENT STATION: BULLETIN 356 



sheep while an assistant handled the shaker. It took about 10 

 minutes to dust one sheep. Each sheep was thoroughly dusted on 

 head, neck, back, rump, legs and abdomen. 



TABLE II.— DATA AND RESULTS OF THE DUSTING 



*A very close-wooled animal. 



tSome of the pupae gathered from this animal hatched out in from 10 to 14 days. 



It will be noted that pyrethum seemed to be more effective 

 than the Cornell (Lawry) powder. However, neither one killed all 

 the ticks and a second and perhaps a third dusting would be neces- 

 sary to get those that escaped or hatched out after the first dusting. 

 Dusting sheep is a tedious operation and could hardly be attempted 

 except upon a small flock. And even then dipping should be re- 

 sorted to in spring to eradicate those that escaped. 



The feeding of sulphur to animals to rid them of their external 

 parasites is often recommended by some well-meaning correspond- 

 ent of the agricultural press. To test this method two lots each of 

 16 ewes, all tick-infested, were given free access to a mixture of 1 

 pound of sulphur and 2 pounds of salt. Each lot received 3 pounds 

 of the mixture. In 2 weeks time they had consumed the mixture. 

 An examination of the ewes revealed more ticks than before the 

 test began. Fumigation gives promise of being an effective rem- 

 edy for external parasites of animals and in time a practical method 

 may be evolved for eradicating these pests by this means. It is in- 

 teresting in this connection to note that soldiers suffering from itch 

 or scabies found themselves cured after exposure to chlorine gas, 

 which was largely employed by the Germans in gas attacks during 

 the war. 



RED-HEADED SHEEP LOUSE 

 Ttiokodtettt sphaooci tphahu 



Symptoms. — Lousy sheep may be observed rubbing them- 

 selves against the feed rack, posts, corners of the sheep pen or 

 other stationary objects in order to relieve themselves of the itch- 



