-10 - 



able material is necessary to concentrate the fine mist on the cows and pre- 

 vent its being blown away. 



E. — Because the delicate parts of the sprayer must be protected on all 

 sides from the cows, a third new post is set in the ground, and boards are 

 nailed between it and the other two new posts. 



F.--A gate placed between the chute and the opposite side of the lane 

 forces the cows to walk through the chute whenever the gate is closed. 



Because some cattle may at first show reluctance to walk .across a 

 treadle in a burlap -covered frame, the sprayer may be installed by stages, a few 

 days being allowed between stages for cattle to become accustomed to the new ob - 

 jects. For instance, the gate and nearest post can be put in place first. Then the 

 working unit, with the treadle spring disconnected, can be put in place and all 

 framework completed. Finally, the burlap can be tacked on the frame and the 

 treadle spring connected. These steps were not necessary when the experimental 

 sprayers at Dixon Springs were installed. The cattle readily walked through the 

 chutes after being driven through once. The fine spray delivered by the small 

 pump does not frighten cattle. 



WHAT TO USE IN THE AUTOMATIC SPRAYER 



The material that gave best results in tests with the automatic sprayers is 

 a solution containing 1 per cent pyrethrins and 10 per cent piperonyl butoxlde. 

 It is commonly sold under the trade name Pyrenone T-143. It must be used as a 

 concentrate, just as it comes from the can. Dilute emulsions of this and other 

 activated P3n?ethrins were not effective in tests. 



Names of local dealers handling Pyrenone T-143 may be secured from 

 the manufacturer, U. S. Industrial Chemicals, 624 South Michigan Avenue, 

 Chicago 5, Illinois. 



Other producers of activated pyrethrins are S, B. Penick & Company, 

 735 West Division Street, Chicago, Illinois, and McLaughlin-Gormley-King Com- 

 pany, 1715 Fifth Street S. E., Minneapolis 14, Minnesota. 



The per -gallon cost of activated pyrethrins seems high to the dairyman 

 accustomed to buying dilute oil sprays, but so little of the pyrethrin concentrate 

 is necessary to give control that the average cost of treating cattle that make 

 two round trips daily through the sprayer is only about 1 cent per animal per day. 

 Activated pyrethrins as used in the automatic sprayer will not injure cattle or 

 contaminate milk. 



WHY USE AN AUTOMATIC SPRAYER? 



An automatic sprayer in which a concentrated solution of activated 

 pyrethrins is used gives the only practical control now known for horse flies on 



