22 



BULLETIN 131, U. ft. DEPARTMENT OP AGRICULTURE. 



PYRETHRUM POWDER. 



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

 the neck and back. Used about 2£ 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. 



10 per cent crude carbolic acid in cot- 

 tonseed oil. 



Do 



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 



50 per cent pine tar in Beaumont oil... 

 10 per cent oil of tar in cottonseed oil. . 



Do 



50 per cent oil of tar in cottonseed oil . . 

 10 per cent oil of tar in Beaumont oil . . 



Do 



50 per cent oil of tar in Beaumont oil . . 



The Moore formula 



Do 



10 per cent oil of citronella in cotton- 

 seed oil. 



Do 



10 per cent oil of sassafras in cottonseed 

 oil. 



Do 



Do 



10 per cent oil of camphor in cottonseed 

 oil. 



Do 



Do 



50 per cent kerosene in cottonseed oil . . 



Beaumont oil 



Fish oil 



Do 



Laurel oil 



Do 



10 per cent laurel oil in cottonseed oil . . 

 Pyrethrum powder 



Do 



Duration 

 of odor. 



Days. 



1+ 



2 — 

 1- 



3 + 

 3+ 

 2- 

 3- 

 1- 



Duration 

 of repel- 

 lent 

 action. 



Days. 



1— 



1+ 



1 + 

 3 + 



1 + 



2 + 

 1- 



1- 



3+ 

 1- 

 3+ 

 3+ 

 2- 

 3- 

 1 + 

 4- 



1 + 

 2 



3 + 



l- 

 l- 



l- 



l- 

 l- 



l- 



i+ 



i+ 



3- 



1 + 

 2+ 

 1 + 

 1 + 

 1 + 



Duration 

 of pres- 

 ence of 

 sub- 

 stance. 



Days. 



1+ 

 5— 

 1+ 



3+ 

 3+ 

 2+ 

 3+ 

 1 + 



7+ 

 1 + 

 2+ 



3+ 



1 + 



1 + 



1 + 



7 + 



1 + 



2 + 

 1 + 

 1+ 

 1 + 



Method of 

 application. 



Spray pump. 



do 



Brush 



Spray pump. 



Brush 



Spray pump. 



do 



Brush 



Spray pump. 



Brush 



Spray pump. 



do 



Brush 



do 



Sprayed . . 



Brush 



Atomizer. 



Brush 



Atomizer. 



do. 



Brush. 



Atomizer 



Brush 



do 



do 



Spray pump. 



Brush 



do 



do 



do 



Effect on animals. 



Phenol poisoning. 



Do. 

 None. 



Caused depression. 

 None. 



Do.- 



Do. 

 Caused stiffness. 

 None. 



Do. 

 Phenol poisoning. 

 None. 



Do. 

 Slight symptoms of 

 poisoning. On 

 second day ani- 

 mal was stiff. 

 Phenol poisoning. 

 None. 



Do. 



Do. 

 Do. 



Do. 

 Do. 

 Do. 



Do. 

 Do. 

 Do. 

 Do. 



Slight loss of hair. 



None. 



Severe exfoliation. 



None. 



Do. 



Do. 



Do. 



