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9 liters of water, snd the suspension wss freouently agitated during 
a 24-hour period. To this suspension was added 1 liter of green-soap 
solution containing 250 gm, of green soap. This suspension was 
shaken just before use snd was brushed into the animal's hide. The 
considered resu lts were satisfactory. The addition of the green-soap solution 
twas/ unnecessary. Satisfactory results '"ere also obtained by brushing 
the cattle "uth a liauid containing 10 gm. of rotenone dissolved in 
250 cc. of acetone, added to 4 liters of ^ater, and by aoulication 
of a salve containing 3 percent of rotenone in vaseline. 
Stefanski and Obitz ( 261 ) in 1935 reported that in. Poland a wash 
of powdered derris root end soft soap, applied at the rate of 4 gm. 
of powder, 2 gm. of soap, and 40 gm. of water per animal, and one made 
with a powder in which derris was incoroorated ^th soap, ^ere tested 
and each killed an average of 90 percent of the larvae. As the young 
larvae are easier to kill, it is important to apply the treatment 
in the first half of April, before the animals are put out to pasture, 
repeating it at the end of May. 
Bartels (15, 16 ) in 1936 called attention to the finding of 
mummified Hypoderma larvae in the backs of cattle that had been treated 
with derris preparations such as Derrilevol, Derrisol, and Derriphen. 
Later in the year he recommended standardized derris preparations for 
the control of larvae in the backs of cattle. Derris root should con- 
tain at least 8 -percent of rotenone and. 25 percent of total extractives, 
Mention was made of the proprietary derris products Derrilavol, Derri:- 
Derrophen, and Panderren. 
Gibson and T^inn ( 109 ) in 1936 reported that losses from all 
causes attributable to " 7 arble flies in Canada had been estimated 
at from 7 to 14 million dollars annually. The standard treatment 
was to auply derris wash: Standardized derris ponder 1 round, soft 
soan 1/4 pound, and water 1 imperial gallon. 
The Ministry of Agriculture of Great Britain (125) in 1936 called 
attention to its Garble Fly order of that year, reauiring that infested 
cattle be treated by mechanical means to remove the maggots, or else 
treated with a '•'ash containing either 1.5 ounces of derris resins 
or 0.5 ounce of rotenone olus 4 ounces of soap per gallon. Treat - 
mupt begin between March 15 and 22, or as soon as the maggots appear 
or under the skin, and must be repeated at intervals of not less than 27 
days/ more than 32 days, as long as they cont ; nue to appear. The 
dressing must be applied so that it shall come in contact "*ith the 
larvae through the breathing holes made bv them in the skin. The 
Governments of Northern Ireland and the Irirh Free State had adopted 
similar measures in their countries. 
Handa ( 135 ) in 1936 reviewed work on the warble fly in India and 
referred to the use in England of the derris-soap "-ash. 
