-81- 
Autographa si gnat a ( F. ) 
Van der Laan ( 245 ) in 1938 reported that in laboratory experiments a j 
dust mixture containing 1 percent of rotenone gave 80 percent of mortalityl 
in 2 days, 
B arathra brassicae (L. ) 
Klinger ( 237 ) in 1936 reported that . laboratory tests -with rotenone 
spray and dust gave no mortality in 8 days on fourth instars of ( Mamestra ) 
B arathra brassicae . 
An anonymous -writer (5) in 1937 -wrote that this species is sensitive J 
to derris powder (0.75 percent rotenone). Care should be taken to reach 
the caterpillars in their hiding places* 
According to Etablissements Rotenia in 1938, in a letter to R. C. Roa# 
a product containing 12 percent of powdered Lonchocarpus nioou r oot (6 peri 
cent rotenone) and 88 percent of talcum mitigated this insect on cauliflowe 
Warwick ( 471 ) in 1938 reported that derris dust and, preferably derris 
spray is suitable for the control of cabbage moths, 
Cameron (59) in 1939 recommended derris dust for destroying cabbage 
moth larvae in Scotland. 
Speyer, Read, and Orchard (383) in 1940 reported that sprays contain-] 
ing derris or Lonchocarpus powders were very effective in rendering foliage 
of cauliflower and broccoli distasteful to both tomato and cabbage moth 
caterpillars. In many experiments but few caterpillars actually diod fraral 
contact with the powders or from eating treated foliage. The deterrent 
action of these powders, however, obviated serious injury to the plants 
and also prevented the caterpillars from obtaining sufficient nourishment I 
to enable them to pupato. Caterpillars of cabbage butterflies were usually 
killed, by contact with the powders. Derris powdor (proprietary brands con- 
taining a spreader) was applied at the rate of 1 pound to 20 gallons water| 
Lonchocarpus powder prevented feeding by the caterpillars when used at a 
strength equivalent to 1 pound to 40 imperial gallons of water, with 4 
pounds of soft soap or 3 to 4 fluid ounces of liquid Agral as a spreader. 
Saponin, sulfonated Lorol, and casein did not wet the foliage of vegetable 
so adequately as did the soap or Agral, 
Brithys crini (F. ) 
A derris dust containing 0.5 percent of rotenone gave complete control 
of this larvae. — Van der Vecht ( 454 ) in 1936. 
Brithys pancratii (Cyr. ) 
Forsley ( 500 ) in 1936 reported that a concentration of 2.45 percent 
for both derris and T.Tundulea bark killed 100 pe rcent of caterpillars of 
this specios dipped for 10 seconds in the solution. 
