-61- 
Kurschner ( 164 ) in 1931 reported the '-proceedings of the sixth 
meeting on marble fly control held, .a.t the German Ministry of Agri- 
culture. It '"as stated tha t infestations occurred only in certain 
regions of Germany, th?=t various larvicidal substances, including 
derris, ^ere available, and that mechanic-1 removal could also "be 
resorted to* 
The United States Department of Commerce, Bureau of Foreign 
and Domestic Commerce ( 298 ) in 1932 published information on warble 
fly extermination in Germany transmitted "by the American commercial 
attache in Berlin, as follows: 
A nev method of combating warble fly was suggested 
. at the last conference held in the Federal Ministry for 
Foodstuffs. A veterinary journal has now approved this 
ne r ' method Hiich has proved highly efficient and i-'hich 
■ " is co'nsi'der.ed to be easier to handle than the treatment 
with :"Larfug" ointment, with grub sticks,- and by various 
■ other methods'. The new method consists of repeated ^ash- 
ing with, a solution of tuba and derris roots/ 
- . ■ . . 'The .solution was prepared, as follows: One*' thousand 
grams -of derris': powder was soaked in 9O00 cc. of i-ater 
for 24 hours during which time the water was stirred 
repeatedly. The' ^ater soon assumed a milky appearance. 
A solution of 25D gm. of soft soap in 1-, 000 cc- of ^vater 
wa-s added so that a total Quantity of 10 liters of wash- 
ing solution were obtained from one kilogram derris pow- 
der,. -The. powder is retained, in the solution, '"hich has 
to be shaken up- for use. The solution of derris and 
soap disintegrates afterebout 1 week so that- suprs lies 
can be, prepared only for this period. The treatment 
of cattle is very simple and requires only a fe m minutes. 
The infected parts of the back are rubbed with the hand 
.- while the solution is applied in small quantities. It 
is not necessary to remove the hair. The individual 
boils are freed from crusts and the boils are cashed 
carefully. Animals that are only slightly afflicted 
will require 150-200 cc. of the solution, '- T hile' more 
serious cases will require 300-400 cc. The washing 
isrepeated after 2 or 3 days. On the average,. 
aiDoroximately 500 cc. of solution will be required 
- for each animal for 2 treatments, so that about 20 
head of cattle can be treated '-ith 1 kg. of derris 
powder, at a cost of about 20 pfennigs per head. 
r ■ •„ ■ ■'■his treatment turned out to be more efficient 
than that of any other chemical preparation tested for 
this purpose. Both young and old grubs m ere killed. 
