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Aphis gossypii Glov., the cotton aphid, the melem aphid 
DDT was not effective and seemed to cause about the sane in or ease 
in aphids as did calcium arsenate, under the conditions of light aphid 
infestations that prevailed in 1944 • In field experiments at Tallulah, 
La., and at Waoo and Bryan, Tex, the aphid populations in plots dusted 
3 to 6 tines with DDT were about equal to those in the plots similarly- 
dusted with calcium arsenate. The addition of 2.5 peroent of DDT to 
the calcium arsenate used in en experiment at Tallulah caused a greater 
increase in aphids than undiluted calcium arsenate or 5 percent of DDT 
in pyrophyllite, but when 1 percent of nicotine was added to the DDT- 
calcium arsenate the aphids were held in check. In a large-scale ex- 
periment at Waco the adults and larvae of the lady beetle were reduced 
67 peroent in the DDT plot and 70 percent in the oalcium arsenate plot. 
At Tallulah these predators were reduced 75 percent in field plots 
dusted with 5 percent DDT and 83 percent in the calcium arsenate plot. 
— Loftin (247) . 
The average number of aphids per 10 feet of rows on muskmelon plants 
dusted with 6 percent of Lethane, 5 percent of Thanite, 3 percent of 
nicotine sulfate, and 3 percent of DDT, was 329, 639, 586, and 803, as 
compared with 2,048 for the control treatment .--Wolf enbarger et al. (379 ) . 
A 3-peroent DDT dust and a spray containing 1 pound of actual DDT 
in 100 gallons of water were inferior to a nicotine-soap spray 1-800 
against melon aphid»— N. J. Agr. Expt. Sta. (275 ). 
In greenhouse tests 1, 2, and 4 ounces of DDT in Velsicol emulsion 
per 100 imperial gallons of water gave aphid kills of 80.8 peroent, 95»6 
percent, and 98.4 percent, whereas in powder suspension 4, 8, and 16 
ounces of DDT per 100 imperial gallons .of water killed 69.9 peroent, 76.6 
percent, and 80.3 percent.— Ross (306 ). 
Eighty hills of cantaloups received two early treatments of cryolite 
and five applications of either 3-percent DDT dust or 20 percent (Gesarol) 
spray. An infestation of melon lice developed on these plots and spread 
to the plots treated with cryolite.— Gould (184 ) • 
Small, lightly infested cotton plants were dusted with a 3-percent 
DDT dust (A-3) at the rate of 25 to 30 pounds per acre. There was no 
apparent control. —Smith (324) • 
In the experimental applications of DDT to cotton, aphids increased. 
DDT is the most effective material yet found against the pink bollworm 
but it causes an increase of aphids.— Annan d (74). 
Three applications of Gesarol A-3 dust to cantaloup at the rate of 
30 pounds per acre were ineffective against aphids.— Ewart (145) • 
