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P. eecta (Johan.), the tobacco hornworm 
In field experiments at Florence, S. C. , and Oxford, H. C, neither 
a 5- o r a 10-percent DOT mixture gave a satisfactory reduction of the to- 
bacco hornworm. In laboratory tests at Oxford fifth-instar tobacco horn- 
verms were not affected by the 10-percent mixture, but the same instar of 
the tomato hornworm succumbed readily. In comparable tests with third 
ins tars 100 percent mortality of the tomato hornworm was obtained in 2k 
hours in each of seven replicates, whereas the mortality of the tobacco 
hornworm averaged 12 percent in 2^ hours and 35 percent in 196 hours. There 
was yery little feeding of either species on the treated foliage. — White 
(22); Stahl et al. (£1). 
Some caged tomato plants were dusted with 3 percent DDT and worms 
put on them, while others were dusted with the worms in place. More worms 
died when they were present to receive the dust. The percentage of kill 
was variable in the different tests, with about 50-P e rcent mortality. The 
tobacco hornwcrms were less affected than the tomato hornworms on the same 
plant.— Gould (IgU). 
Tineidae 
(Clothos moths ) 
Garments impregnated with DDT are mothproof and remain so for a very 
long time,— Buxton ( 100 ). 
Tortricidae 
Ar chip s argyrosplla (Wlk.) the fruit tree leaf roller 
Apple trees infested with nearly mature larvae were treated with a 
spray containing 2,5 quarts of 20 percent DDT in oil, with emulsifier 
(SH-20), per 100 gallons of water. Within a short interval after spraying, 
the larvae left the foliage and were hanging by their silken threads. Many 
dropped to the ground; none were found on the trees 4S hours after spray- 
ing, whereas unsprayed trees remained infested. The spray caused a spotted 
leaf injury.— Borden and Jeppson (j)0). 
Archips fumlferana (Clem.), the spruce bud worm 
Tests with high-powered ground equipment, conducted at Tort Collins, 
Colo., demonstrated that the spruce budworm can be controlled with dosages 
as low as 2.5 pounds of DOT per acre, applied as an emulsion in linseed 
oil or as a finely divided alcohol-water suspension. Some of the sprays 
were applied prior to larval activity in the spring; others were used when 
the larvae were one-half to full grown. There were indications that the 
early applications, which killed the young larvae as they began feeding, 
were partially effective in killing the moths several weeks later; therefore, 
