-8- 
This spray gave 65 percent of paresis in 2-cc. dosee and 100 
percent mortality in 3-cc. doses. (B) Rotenone extract, 1 per- 
cent; General Naval Stores Pine Oil No. 2, 99 percent. IVo cc. 
of this spray gave 100 percent mortality. 
Laake, of the Valdosta, Ga. , laboratory of the same Division, 
in a typewritten report for the second quarter of 1936, reported 
tests with derris products as larvicides applied to rounds in 
infested goats. The following mixture killed all larvae: Benzene 
40 percent, carbon tetrachloride 30 percent, acetone 25 percent, 
derris resins 5 percent. The following mixtures gave excellent 
control: Benzene 55 percent, carbon tetrachloride 30 percent, 
acetone' 12.5 percent, derris resins 2.5 percent; benzol 64 -percent, 
carbon tetrachloride 30 percent, acetone 5 percent, derris resins 
1 percent; and soluble pine oil 85 percent, acetone 10 percent, 
derris resins 5 percent. 
In immersion tests in the laboratory with mature larvae 
the following gave 100 percent control: Carbon tetrachloride 
containing 5, 10, or 15 percent of devils-shoestrings; benzene 
containing 5 or 20 percent of devil' s-shoestrings; and benzene 
30 percent, carbon tetrachloride 23 percent, acetone 27. percent, 
derris resins 10 percent. Mixtures of furfural 83 percent and 
derris rosins 17 percent killed 96 to 98 percent of the larvae. 
The following mixtures of pine—tar oil, acetone, and derris 
resins, in the percentages given, respectively, when applied to 
the clipped skin and wounds in goats did not cause injury: 70.0: 
25: 5: 72.5: 25: 2.5: 74: 25: 1; 85: 10: 5: 87.5: 10. : 2.5: 89: 
10: 1: and pine-tar oil 85 percent plus devils'-shoestrings 15 
percent. 
Laake, in a similar report in 1936, stated that of prep- 
arations tested as repellents, pine- tar oil to which had been 
added ground derris root, rotenone, or derris resins seemed to 
be the most promising mixtures. Of larvicides tested in the 
field at Vpldosta, Ga., mixtures of benzol, acetone, carbon 
tetrachloride, and 2.5 or 5.0 percent of derris resins gave good, 
control. A mixture of benzol and carbon tetrachloride containing 
10 percent of ground derris root gave good control. In this mix- 
ture most of the derris root did not go into solution but settled 
to the bottom of the container. Materials found highly toxic to 
flies when applied as sprays were Lethane, rotenone, and pyrethrum 
extract. 
McGorran ( 192 ) reported in 1936 that in preliminary field, 
tests at V P ldosta a mixture of pine-tar oil 85 percent, acetone 
10 percent, and derris resins 5 percent was more repellent to the 
flies than pine- tar oil. alone. 
