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In New Brunswick a derris spray gave significant control, but a 
derris dust and a spray of nicotine sulfate did not.— Vaxwell ( 406 ) « 
Pieridae 
Pleris bra8slcae (L.), tne cabbage white butterfly 
In England a 0.1-peroent rotenone dust gav« satisfactory control 
of this pest on Brassloa orops under field conditions. The follow- 
ing formula was used: Lonohooarpus nicou (4 peroent ef rotenone) 2.5 
pounds, gypsum seoonds mineral 92«5 poinds, and amorphous silica dust 
5 pounds. About 70 pounds of the dust per acre were required to dust 
a orop in autumn*— Kearns (338) • 
Derris resin and rotenone were toxic to the eggs in laboratory 
tests.— Potter and Tattersfield (471) . 
Sprays or dusts containing Derris or Lonohooarpus were suggest- 
ed in 1942 for control of the caterpillars on garden orops in England. 
—Walton (653 ) . 
Derri6, in either dust or spray form, can be used in New Zealand 
to protect the tops of turnips.— Pritohard (476) . 
Pieris canidia (Sparrm.) 
Derris sprays gave promising results against this species on 
cabbage in China. — Chan ( 110) • 
Pieris napi (L.) 
Rotenone sprays and dusts were suggested in 1942 for control of 
this species on garden crops in England.— Walton (653). 
Pieris rapae (L.), the imported cabbage worm 
Rotenone dusts were very effective in most cases in New York. 
Syntone, NNOR, and Special Agioide Concentrate were decreasingly ef- 
fective in the order named. Derris (4 pounds to 100 gallons) was 
superior because it contained four times as much rotenone. The addition 
of 3 peroent of Lethane 60, crude soybean oil, and sodium oleyl sul- 
fate did not increase the toxioity of the retenone dusts.— Hervey 
( 278 , 280 , 281), 
An analysis was made of derris residues on marketable heads of 
cabbage which had been dusted at 7-day intervels with 5 applications of 
