22 



BULLETIN 131, TT. S. DEPAKTMESTT OP AGRICULTURE. 



PYRETHRUM POWDER. 



July 25, 1912, a cow was dusted with pyrethrum powder along 

 the neck and back. Used about 2J ounces of powder. Flies were 

 observed to light frequently on the treated portions of the body and 

 remain for a time. 



July 26, an attendant reported that there was plenty of powder 

 still present and that it seemed to repel the flies. 



August 9, 1913, pyrethrum powder was applied to the skin of a 

 cow. The repellent action was very marked. August 10, only a very 

 slight protective action was noted. 



Pyrethrum powder when applied to the skin of cattle has a very 

 marked repellent action, but this lasts only for about a day. 



SUMMARY OF EXPERIMENTAL TESTS. 



The experimental tests are summarized in the following table : 

 Summary of experimental tests. 



Substance used. 



Duration 

 of odor. 



Duration 

 of repel- 

 lent 

 action. 



Duration 

 of pres- 

 ence of 

 sub- 

 stance. 



Method of 

 application. 



Effect on animals. 



10 per cent crude carbolic acid in cot- 

 tonseed oil. 

 Do 



Days. 



Days. 



Days. 



Spray pump. 

 . do.... 



Phenol poisoning. 

 Do. 









Do 



1+ 



2— 

 1- 

 3+ 

 3+ 

 2- 

 3- 

 1- 



1— 

 3+ 

 1— 



3+ 

 3+ 

 2— 

 3- 

 1 + 

 4- 



1+ 

 5— 

 1+ 

 3+ 

 3+ 

 2+ 

 3+ 

 1+ 



Brush 



Spray pump. 



Brush 



Sprav pump. 



do 



Brush 



Sprav pump. 



Brush 



Spray pump. 



do 



Brush 



do 



Sprayed 



Brush 



Atomizer 



Brush 



Atomizer 



do 





10 per cent pine tar in cottonseed oil... 



20 per cent pine tar in cottonseed oil . . . 



50 per cent pine tar in cottonseed oil. . . 



Do 



Caused depression. 

 None. 



Do. 



Do. 



50 per cent pine tar in Beaumont oil... 



10 per cent oil of tar in cottonseed oil. . 



Do 



Caused stiffness. 

 None. 

 Do. 



50 per cent oil of tar in cottonseed oil. . 



Phenol poisoning. 





7+ 



1 + 



2 + 



3+ 



Do 



1- 



1+ 



3+ 



1 + 

 2 



3+ 



Do. 



50 per cent oil of tar in Beaumont oil.. 



Slight symptoms of 

 poisoning. On 

 second day ani- 

 mal was stiff. 



Phenol poisoning. 



None. 



Do 



10 per cent oil of cirronella in cotton- 

 seed oil. 

 Do 





1- 



1- 

 1- 



1- 



1- 

 1- 





Do. 



X - 



1+ 



Do. 



10 per cent oil of sassafras in cottonseed 

 oil. 

 Do 



Do. 



1- 





Do. 



Do 



1 + 



Brush 



Do. 



10 per cent oil of camphor in cottonseed 

 oil. 

 Do 





Do. 



1- 

 1- 





Atomizer 



Brush 



do 



do 



Spray pump. 



Brush 



do 



do 



do 



Do. 



Do 



1- 

 1 + 

 1 + 

 3- 



1 + 

 7+ 



Do. 





Do. 





1 + 

 3+ 



Do. 



Fish oil 



Slight loss of hair. 



Do 



None. 





1 + 

 2+ 

 1- 



1 + 



2 + 

 1 + 

 1 + 

 1 + 



1 + 



2 + 

 1+ 



1 + 

 1 + 



Severe exfoliation. 



Do 



None. 



10 per cent laurel oil in cottonseed oil. . 



Do. 

 Do. 



Do 







Do. 











