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In an orchard in Buena Park, Calif,, citrus aphids became serious 
pests after DDT was used, whereas they were of no commeroial ixnportanoe 
in plots where oil only was used.— Ebeling (142) * 
Aphids on cole crops and heans were not controlled by eight appli- 
cations of 5 peroent DDT in light summer spray oil— average about l/2 
gallon per acre— made by hand atomizer from June 6 to August 1*— Gray 
(188) . 
One peroent of DDT in kaolin was dusted on sheets of paper on 'anion 
inseots were separately plaoed and covered with a beaker* This dust 
proved ineffective against aphids.— Sen (311 ) . 
Large aphid populations that existed in all alfalfa plots dusted 
witii 10 peroent of DDT in pyrophyllite were practically eliminated. Most 
of the ooamon alfalfa-field inseots observed in the DDT-treated plots 
probably were immigrants.— Li eb ©roan (245) . 
Ceroopidae 
Aphrophora saratogensis (Fitch), the Saratoga spittle bug 
At Milwaukee, Wis*, oil emulsions containing from 0*1 to 1 percent 
of DDT were tested* Sprayed pine trees showed no sign of tip kill at 
the end of the season* The material appeared to have a distinct repellent 
effect, but nhen the inseots were caged on sprayed branches complete mor- 
tality usually resulted in 24 hours*— Craighead and Brown (125 ) ♦ 
Unidentified spittle bugs 
A DDT aerosol produced exoellent kills of spittle bugs on peas.— 
Ditaan (135 )* 
Philaenus leuoophthalmus (L.), froghopper 
Greenhouse and inseotary tests t DDT, 4 ounces in peerder suspension 
per 100 imperial gallons of water, applied as a residual poison on foliage 
gave oomplete control of froghoppers* The same spray applied only to 
insects killed 98 percent; at 8 ounces 100 percent were killed* Tfihen used 
in a Velsiool emulsion 1 ounoe of DDT per 100 imperial gallons of water 
killed 88 percent of the insects and 4 ounces killed 94 percent* Gesarol 
A-5 dust applied to spittle had no apparent effect on nymphs.— Ross (306 ) * 
