22 



GRASSHOPPERS AND OTHER INJURIOUS INSECTS OF 1911 AND 1912. 



Of course, the question at once occurs to the practical farmer as 

 to whether this is dangerous to stock. We have made tests along 

 this line, and while it must be remembered that any poison is detri- 

 mental and frequently fatal if taken in too large amounts, we feel 

 convinced from our experiment, that, as ordinarily used by a farmer 

 bearing the above fact in mind, no bad results will happen. A Hol- 

 stein bull was fed with forage poisoned with this spray in the above 

 proportions, being fed about 15 pounds of this each day for ten days, 

 and showed absolutely no symptoms of poisoning. 



Fig-. 15. Our sprayer api)!^!!!^ Arsenitc of Soda. 



As further proof that this compound if handled rightly will not 

 affect stock we give here details of a final and to us convincing ex- 

 periment : On May 20th, 1912, we sprayed an enclosed small pas- 

 ture containing 1-10 of an acre with the above described arsenite of 

 soda spray, applying it at the rate of 60 gallons to the acre. A 

 young heifer purchased for the experiment was turned into the 

 enclosure that evening, and (since she had been stall-fed for several 

 days) she immediately ate heartily of the poisoned forage. May 

 21st, no bad effect noticeable. Heavy rain on night of 21st, prob- 

 ably washing a large proportion of the poison from the grass. May 

 22d, heifer in good condition apparently; bowels quite loose but 

 doubtless due to abundance of grass feed. Heifer was then placed 

 on untreated grass outside of lot for three days, during all of which 



