-95- 
with heavy paraffin oil, was pressed into the warble openings with 
the fingers, or injected with a large hypodermio syringe with the 
needle removed. In all herds so treated the derris preparations 
gave practically 100 percent kill of ihe grubs.— Has eman and Roland 
(269) . 
There was little difference in effectiveness in 1941 between 
washes of derris and cube powders mixed at the time of treatment, 
and washes containing derris and soap powders, or 12 ounces of derris 
and 4, 6, and 8 ounces of fused bentonite sulfur* The percent ef- 
fectiveness of single treatments ranged from 60 to 100, with an 
average of about 90* The washes reached maximum effectiveness in 10 
to 15 days and ceased to be effective 25 to 30 days after applica- 
tion.— U« S* Bureau of Animal Industry (612) * 
Derris and cube washes in 1941 were more effective than chemical- 
ly pure rotenone or a preparation containing 90 percent of rotenone* 
Derris and cube powder (4 percent of rotenone) were as effective as 
those containing 5 peroent of rotenone, and washes made with 12 ounces 
of powder to 1 gallon of water were as effective as those made with 
16 ounces and were safe and effioient, but washes containing only 8 
ounces of powder were not fully effective. Single treatments of in- 
fested cattle with washes made of 12 ounces of derris or cube, 4 
ounces of soap flakes, and 1 gallon of water gave 90 to 100 percent 
kill* The washes were applied to the back and upper parts of the 
sides of cattle with stiff brushes at the rate of about 1 pint per 
animal*— Smith, Livengood, and Roberts (548) » 
Cattle growers reported that the louse powder controlled war- 
bles even though it contained only 1 percent of rotenone* An abun- 
dance of rotenone at 2*5 percent strength was made available for 
warbles in large herds, but under the "WPB regulations none was a- 
vailable for lice.— Clemson Agricultural College (116) * 
Cattle grubs are best controlled by applications of powdered 
derris or cube root to the baoks of the infested animals* These 
powders may be applied in the form of a wash, dust, or spray, and 
full directions for applying each are given*— Smith and coworkers 
(664); U. S. Extension S«rviet> (634) 
In experiments in Colorado, New Mexico, and Texas, in which a 
commercial hymolosalt was substituted for soap in derris and cube 
washes for the control of ox warbles, about 91 to 97, 75 to 80, and 
37 to 52 percent control, respectively, was effeoted*— U* S* Bureau 
of Animal Industry (613 )* 
STATE. 
*£&**> 
