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ly destroyed by the application of a small amount of derris or cube 
powder scattered through the hair next to the skin along the neck 
and back of the animal. Washing the animal in water containing 
derris or cube powder and soap is an excellent method of control* 
— Biahopp (54) . 
In tests with six flea powders containing derris, pyrethrum, 
and sodium fluoride, the only one that gave satisfactory results con- 
sisted of 31.25 percent of derris and 68.75 percent of talc. Pyre- 
thrum stupefies the fleas on cats and dogs temporarily while derris 
kills those with which it oomes in contact. The combination of the 
two is useless because the pyrethrum causes the fleas to drop off the 
animal before the derris has time to aot, and the fleas revive and 
return to the cat or dog after it has shaken off most of the powder. 
— Kissileff (341). 
A wash of derris powder that was compounded for treating warbles 
on cattle was ineffective against cat and dog fleas.— Spencer (556 ) • 
In New South Hales to control fleas on cats and dogs it was reoco- 
mended to dust derris or pyrethrum into the hair every week.— New South 
Wales Department of Agrioulture (442 ). 
Unidentified fleas 
In West Australia pyrethrum or derris is most universally recom- 
mended against fleas in military camps.— Jenkins ( 521 ) . 
In Brazil a dip containing a dilute water extract of timbo roots 
and soap solution was found effective against fleas and lice on do- 
mestic animals.— Key er ( 414) ♦ 
To rid infested pets of fleas, dust them with derris or pyre- 
thrum powder, or a combination of the two. If the treatment is to 
be a liquid shampoo, 2 ounces of derris powder added to a gallon of 
soapsuds is satisfactory.— Roselle and Haseman ( 515 ) • 
TBTSANOPTERA 
Thripidae 
Bregmatothrips iridis Watson, the iris thrips 
For control two sprays are reooinra ended 1 Derris powder and sul- 
fonated castor oil in water, and niootine sulfate (40 percent). These 
kill 99 to 100 peroent of the thrips after several applications •— 
Utter and Smith (635). 
