-119- 
Pieridae (unidentified sp. ) 
Kearns ( 229 ) in 1934 reported that the larvae of the cabbage butter- 
fly were easily controlled by a derris spray. 
Warwick ( 471 ) in 19 38 reported that derris dust and, preferably, der- 
ris spray controlled both the large white butterfly and the small white 
butterfly on cabbage. 
Plutellidae 
Plutella maculipennis (Curt.), the diamondback moth 
See the Colorado Agricultural Experiment Station (73, 74, 76_) on 
pp.76, 77 , in the United States Department of Agriculture, Bureau of 
Entomology and Plant Quarantine ( 457 ) r on p« 70, Crosby et al, (87). 
on p. 79 , Hervey and Palm ( 190 ) on p. 77 , Huckett ( 201 ), on pp. TT, , 
the Ohio Agricultural Experiment Station ( 314 , 317 ) on p 74, 75, 
Roney and Thomas (358) on p. 76 , and TJhite ( 478~ ) : on p. 67 , under 
Autographa bras sicae (Riley). 
Bange (22) in 1927 reported the use of a decoction of Derris ellip- 
tica roots against caterpillars. Because it is not entirely effective, 
lead arsenate was mixed with it. 
Morgan ( 283 ) in 1929 described tests with insecticides in New South 
Wales at a time when the moth was unusually abundant. After a second 
application of a proprietary derris compound as a spray it was evident 
that the plants were not sufficiently protected from the larvae, and 
further testing of this spray was abandoned. 
Jarvis ( 221 ) in 1931 recorded comparative tests with Katakilla 
(2 lb. to 40 imp, gal, of water) and nicotine sulfate ( l/2 pt; plus 2 lb. 
of lead arsenate to 40 imp. gal.). Katakilla killed 80 percent of the 
pupae and 87.5 percent of the larvae, as compared with 26.6 percent of the 
pupae and 33.3 percent of the larvae killed by the nicotine and lead 
arsenate spray. The plants treated with Katakilla were cleaner and bet- 
ter grown. 
Andries (13) reporting on the control of plant pests in Southern 
Africa in 1932, wrote that Derrisol and Katakilla at 1:800 are effective 
against the diamondback moth near the time of marketing. 
The United States Department of Agriculture, Bureau of Entomology 
( 434 ) in 1933 reported that tests have shov/n that neither paris green, 
lead arsenate, nor calcium arsenate will give as effective control of 
the larvae as will derris dusts containing 1.75 percent of rotenone, 
applied at the rate of 12 to 15 pounds per acre, or pyrethrum dusts con- 
taining 0.12 percent of pyrethrin I and applied at the same rate. Helle- 
bore was found to give better control than the arsenical s but was con- 
siderably inferior to the derris and pyrethrum products. 
