VA) DIPTERA OF MINNESOTA. 



animal. Three parts of fish oil and one part of kerosene sprayed 

 over steers also gave excellent rsults, and is manifestly the practical 

 thing when many are to be treated. Fish oil costs in Minneapolis 

 about 45 cents per gallon in barrel lots. 48 cents in half barrel lots, 



Fig. 145. Horn Flies on horn of cow. Original. 



and 60 cents for single gallons. Spraying an animal is best done 

 with a knapsack sprayer, and it takes two or three minutes to spray 

 each creature. This spray appeared to keep ofif horn flies and all 

 other flies for two days. If a herd were to be treated, a man with 

 some kind of spraying machine might stand on either side of a nar- 

 row passage, through which the animals had to pass, and quickly 

 treat a large number. If the writer were keeping two, three or four 

 family cows, he would not hesitate to use either one of the two rem- 

 edies above described, which he has tried and found good. He was 

 so situated, however, when keeping a cow, that he could turn his 

 cow into the pasture at night during the hot weather and "fly time," 

 and thus avoid trouble, keeping her in a dimly lighted stable during 

 the day. They were observed this year at St. Anthony Park, May 

 19th. 



Prof. Weed, in a Mississippi bulletin (Ko. 28), states that he 

 found a mixture of two parts of crude cotton seed oil, or fish oil, 

 with one part of pine tar very successful. It took him half a minute 

 to apply this to each animal, using a large paint brush for the pur- 

 pose. He claims that the efficacy of this wash lasted for a week 

 or more. 



