-19- 
On sweet corn: The use of mineral oil plus 3 percent of dichoro- 
etnyl ether appeared to be a praotioal method of controlling this pest 
on sweet corn for market in Maryland* The addition of 0*1 percent of 
pyrethrlns to the oil imoreaaed its effectiveness, but the addition of 
derris extract or nicotine.-^uL'OBan and coworkers (147) • 
The mineral-oil injeotion method was tried in Hawaii. Oil was 
applied alone, and with the addition of a derris extract (5 percent of 
rotenone in a total of 20 percent of extractives dissolved in camphor 
oil) whioh was used at the rate of 36 cc. per gallon of oil, giving 0.05 
percent of rotenone in the mixture* 0*8 cc* of oil was ejected at a 
time on silks as near the tip as possible* Two weeks later the percent- 
age of tips damaged by larvae was 10*6 when oil was used alone, 6.2 when 
derris extract was added, and 60*8 on untreated plants* A single treat- 
ment of the field may be sufficient .—Schmidt (522 )* 
A dust of derris and talo (1:3) was effeotive in some oases in 
Puerto Rico.— App (20)* 
On Tomatoes: In Hawaii sprays of oopper ammonium silicate used 
alone, or with a 5-percent rotenone concentrate, or witn a commercial 
derris added, gave significant reductions in percentage of infested 
fruit*— Hawaii Agricultural Experiment Station (270 )* 
Of 30 cnemioals tested against third- ins tar larvae, derris (5 per- 
cent of rotenone) and basic copper arsenate had the most delayed effect 
but killed at least 90 peroent*— Sherman and ooworkers (637 ) . 
Cube (5 peroent of rotenone), mixed with 4 percent of cottonseed 
oil and kaolin, and used as a dust, gave no oontrol in South Carolina*— 
Watts (660)* 
Rotenone and oopper-rotenone were called poor for this pest in 
victory gardens in Indiana in 1943*— Reed (496 )* 
On Otner Plants: Rotenone was of little value against this insect 
on lima beans in Tennessee*— Marcovitch (394 )* 
Rotenone dusts were ineffective on snap and lima beans in Maryland* 
— Ditman (143) ; Graham and Ditman (240 ). 
Derris dust apparently did not affect it on brocooli*— Walker and 
Anderson (646) . 
Derris dusts were ineffective on cabbage.— Reid and coworkers (499 ) . 
