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on the sprayed plots and yellowing was only faintly notioeable on the 
dieted plots* Melon lice started on these plants before harvest and 
hardly a oueunber was picked. The beetles were not troublesome. Two 
early treatments of cryolite and five applications of either 3-peroent 
DOT dust or 20-peroent Gesarol spray on 80 hills of cantaloups caused 
no vine injury and no beetle trouble. An infestation of melon lioe de- 
veloped on these plants* On 15 hills of squash the 3-percent dust 
caused rather severe yellowing of the foliage. No trouble from beetles, 
but a severe louse infestation developed on all plots.-- Gould (184 ). 
A. 3-peroent DDT dust and a spray containing 1 pound of DDT in 
100 gallons of water were tested in preliminary small-plot field experi- 
ments on cuourbit crops. The DDT spray and dust gave outstanding con- 
trol of striped and 12-spotted cucumber b*"*tles, fair control of early- 
instar nymphs of squash bug, and control ec sparable to 1-peroent rote- 
none dust on squash borer. They were both inferior to a It 800 nicotine- 
soap spray against melon aphid. DDT treatments caused severe plant in- 
jury to young acorn squash, cantaloups, and cucumbers, and the yield of 
Hubbard squash was reduced.— N. J« Agr. Hxpt. Sta. (276) . 
Diabrotioa 11-punotata Mann., the 11-spotted beetle 
In laboratory tests adult beetles were very sensitive to DDT in any 
form. In most cases, the time required for a 100 percent kill was the 
same whether the insects were directly treated or were plaoed on treat- 
ed foliage. The beetles reacted to DDT within an hour, but several days 
were usually required for a final kill* There was no consistent difference 
between the percentages of DDT in -the oils for the range 0*3 to 5*6 per- 
cent. The 3~percent dust was superior to the 1-peroent dust*— Lange (242) * 
Controlled by eight applications of 6-peroent DOT in light summer 
spray oil, average about 1/2 gallon per acre, made by hand atomiser from 
June 6 to August 1.— Gray (188) * 
A 3-percent DDT dust and atomised oil containing 5 percent of DDT 
were effective. A bait spray containing 1 percent of DDT and 10 percent 
of brown sugar waB more effective than one containing 10 percent of barium 
fluosilicate and the same amount of brown sugar.— Gray and Schuh (189 )* 
Pour specimens swept from alfalfa were lightly dusted with 3-percent 
DDT dust (A-3) and held in an inseot net wiih alfalfa cuttings over night; 
all were killed.— Smith (324) ♦ 
Diabrotioa longicornis (Say) , the corn rootwora 
A 3-percent DDT dust was effective against the adults*— Hasemm (203 ). 
Diabrotioa vittata (P*), the striped cucumber beetle 
This beetle was completely controlled with Gesarol £-3 dust* The 
vines produoed until late summer, an unheard-of condition previously*— 
Parker (287). UBRARY 
.to pi.aNT BOARD 
