-17- 
Trichoplusia nl (Hbn.) ( "Autographa brass icae (Riley)), the oabbage 
looper 
Rot en one dusts were less effective than pyrethrum dusts for 
checking infestations on Long Island* Powders of derris, cube, and 
timbo having nearly equal extractive content did not significantly 
differ in protective values. Dust mixtures of 0*5 to 1 percent rote- 
none content were of nearly equal value for control purposes.— 
Huckett (296). 
Rotenone dusts were much less efficient than lead arsenate spray. 
Syntone (2.8 percent of rotenone), NNOR (l percent of rotenone), and 
Special Agicide Conoentrate (a derris suspension) were decreasingly 
effective in the order named. Derris powder (4 pounds to 100 gallons) 
was superior to all the other treatments because it contained four 
times as much rotenone. The imported cabbage worm was much more sus- 
ceptible to rotenone than was the cabbage looper. There was little or 
no difference between derris and cube; small but consistent differences 
in control between 1, 0.5, and 0.25 percent rotenone dusts at 20 to 
25 pounds per acre} and none between dusts of 1 and 0.5 percent rote- 
none content when the rate was higher. In 1939, four, three, and two 
applications of a 0.75-percent rotenone dust increased the yield by 
22*9, 16.5, and 12.6 percent, respectively. It was concluded that a 
0.5-percent rotenone dust is as effective as a more concentrated one 
if it is applied at 35 to 40 pounds per acre, and that the best dust 
for use on cabbage consists of a mixture of rotenone- bearing root and 
a carrier auoh as talc— Hervey (278 , 280 , 281 ). 
A dust containing 0*6 percent of rotenone and 3 percent of 
Lethane 384, and also dust containing 0.4 percent of rotenone and 2 
percent of Lethane gave very promising results near Norfolk, Va., as 
compared with the other derris dusts.— Walker and Anderson (647 ) . 
(Autographa ) Anagrapha falcifera (Kby.), the celery looper 
In 1942 it was recommended that a 0.75-percent rotenone dust be 
substituted for the 1-percent dust formerly used against celery and 
lettuoe loopers.— United States Bureau of Entomology and Plant Quaran- 
tine (626). 
Rotenone was recommended against loopers (•greenworms*) on 
lettuoe in North Carolina in 1943.— Eaxwell (407 ). 
Brotolomia metriculosa (L.), the angle-shades moth 
Derris dust prevented the feeding of larvae on roses in England 
up to 4 days but did not kill them.— Speyer (558, p. 73). 
