-58- 
G-aut ( 101 ) in 1931 reviewed the results of tests in 1928-31 in 
the Eme county. The derris-soap wash (polvo l/2 lt>. , soft soar) 1/4 
lb., and water 1 imp. gal.) was used successfully in 15 areas, on 
more than 10,000 head of cattle on nearly 500 farms. He (102) in 
1936 called attention to his previous ( 101 ) report on derris wash 
and recommended its application with a 1-gallon short-spouted watering 
can. 
Davies (68_) in 1930 described tests with four derris powders and 
two derris solutions for the control of Hypoderma larvae in North 
Wales. When it was used as a wash, derris ponder from three of the 
sources nroved highl.v toxic to warble fly larvae under critical, 
general, and ordinary farm conditions. The powder was applied, accord- 
ing to the formula of Bishopp et al. ( 30 ) . The wash evidently "'ill 
not retain its toxicity if kept more than a day or so after it is 
prepared. Four monthly dressings were proved to be necessary. It 
was estimated that 1 uound of derris nowder is sufficient to provide 
a wash for 4 monthly dressings for 20 to 25 infested cattle. 
Fulmer (90) in 1930 reported that larvae of the ^arble fly were 
amenable to derris. 
Hollstein ( 141 , 142 ) in 1930 described tests with Kur-Mange, a 
powder containing dried soda sopd, borax, unknown constituents, and 
rotenone extracted from Derris ellrotica . When user! at the rate of 
10 gm. per 200 cc. it was useful for combe tin.~ warble fly larvae 
'"hen applied by injection. Kur-iwange at 31 gm. to 550 cc. o*~ ^ater 
killed 95 percent of the larvae in tests made in England. Cooper's 
Warble Fly Salve (Dasselfliegensalbe) is useful for combating ^arble 
fly larvae ^hen applied by injection. 
• 
Jensen ( 152 ) in 1930 mentioned derris extract as one of the 
preferred preparations for the treatment of cattle grubs in Jutland. 
The .University College of North Wales, Department of Agriculture 
( 219 )^ in 1930 stated that in Great Britain the annual loss caused by 
warble holes in hides is estimated to be more than 500,000 pounds 
sterling. A derris wash made according to the formula of Bishopp 
et al. (29) is recommended.. 
Schwerdt ( 248 ), in 1930 reported that Kur-^enge and Cooper's Warble 
Salve (derris preparations) -"ere found to be inconvenient in the treat- 
ment of warbles, although in the hands of an ecperienced man, esnecially 
a veterinarian, thev could be used with favorable results. 
The United States Department of Agriculture in a release to the 
press on May 25, 1930, reported that cube is fatal to cattle grubs. 
The derris and cube root powders had no unfavorable effect on the skin 
and hair of the animals tested and are not particularly poisonous, 
hence are safe to use. Applications of these rowders at 15-day interval 
