-102- 
was inferior to oryolite against both first- and seoond-generation borers • 
A TOT spray (20 pounds of 10 peroent DDT-pyrophyllite plus 7 1/2 ounces 
of a sticker per 100 gallons) applied at the rate of 50 gallons per acre 
four times at weekly intervals gave 29 percent oontrol as oompared with 
85 percent when synthetio cryolite dust was used* The inorease in 
borers in the DDT plots in the first experiment may have been due to its 
effect on Trichograrproa and other natural enemies of the borer under 
oonditions of a heavy infestation, when Triohogranma is usually more 
abundant.— Ingram et al. (222.) • 
DDT is not effective.— Annand (74). 
Geleohiidae 
Anarsla lineatella Zell., the peach twig borer 
One application of Gesarol A-20, at the rate of 2 pounds per 100 
gallons of water, to an aprioot tree when the aprioots were 1/2 inch in 
diameter resulted in a crop of wormfree fruit.— Jones (252 ) . 
Gnorimosohema operoulella (Zell.), the potato tuber worm 
In laboratory tests larvae displayed a violent reaotion to DDT ma- 
terials applied direotly to them. They reacted faster to vapo-sprays 
than to 3-peroent EDT dust. Adult moths dusted or sprayed with the DDT 
combinations immediately lost power of locomotion, and died within 24 
hours.— Lang e (242 ) . 
Thoroughly dusting seed potatoes with a 2 -percent DDT dust prevented 
them from becoming infested with newly hatched tuber worms.— Walker (365 , 
566) . 
Kelferia lycoper3icella (Busck), the tomato pinworm 
DDT dust (5 peroent) and spray (4 pounds of a 25-percent wettable 
powder per 100 gallons) were more effective than oryolite dust or rote- 
none spray.— Neiswander (274 ) • 
Pectinophora gossypiella (Saund.), the pink bollworm 
DDT is the most effective material yet found against this pest but 
it causes an increase of aphids. In preliminary tests a combination of 
DDT with an arsenical was very good.— Annand (74). 
DDT is the most promising material that has been tested against this 
insect. At Presidio, Tex., DDT, cryolite, and mixtures of the two were 
compared <n l/5-aore plots. Dust applications of approximately 15 pounds 
per acre were started when the oldest bolls were large enough for the pink 
bollworm to attack, and were repeated at approximately 5-day intervals. 
