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The cabbage worm, cabbage looper, and diamondback moth were controlled 
completely "by applications of Gesarol A-3 (3-P© r cent DDT) dust to cabbage 
every 5 weeks from May 15 until harvest, July 15. This dust apparently in- 
creased growth slightly and prevented head splitting at maturity when re- 
newed growth started due to rain.— Parker (2 8J ) . 
See Trlchoplusla nl.— White (373) ; H. J. Igr. Expt. Sta. (275). 
The treatments used were as follows: 1, 2, and 3 percent DDT dusts 
(talc base), l/2, 1, and 2 percent DDT sprays, an emulsible liquid spray, 1 
ounce of the active ingredient in 100 gallons of spray, and a paris green 
spray. The 1-percent dusts and l/2-percent sprays gave as good control as 
did the higher concentrations when applied every 2 weeks. An emulsible 
DDT liquid spray gave perfect protection against all the cabbage worms for 
2-3 weeks when applied at a rate that gave only 1 ounce of the active in- 
gredient in 100 gallons of spray. At one time 5 weeks elapsed between treat- 
ments on the plots dusted with a 3-p«rcent DDT dust. At the end of this 
period only 3 percent of the plants were infested with worms as compared 
with 50 percent on the paris green plots, which had "been sprayed every 2 
weeks. The untreated plots showed an 80 percent infestation.— Russell ( ^08 ). 
Plutellidae 
Plutella maculipennis (Curt.), the diamondback moth 
A dust containing as little as 0.5 percent of DDT gave good control 
of this insect. An aerosol containing 3 percent of DDT also gave excellent 
control of this pest on large broccoli plants.— Walker Q65 » 366 )» 
Psych idae 
Thyrldopteryx ephemeraeformls (Haw.), the hagworm 
Actively feeding bagworms were removed from a badly infested sycamore 
tree and placed on uninjured foliage from a nearby tree. In the laboratory, 
a single spray of DDT, at the rate of 1 pound of DDT in 100 gallons of 
water plus l/^ pound of Areekap, was applied to branches containing bagworms. 
The infested tree was also sprayed. In the laboratory test 28 percent of 
•the bagworms "were dead 2k hours after treatment. The tree was half defoliat- 
ed and heavily infested when treated. Defoliation was completed after spray- 
ing. — N. J. Agr. Expt. Sta. (275). 
This Insect was readily controlled with DDT (0.1 to 1 percent) applied 
as an emulsion in small-scale tests. — Craighead and Brown ( 125 ). 
Pyralididae 
Dlatraea sac cha raits (P.), the sugarcane borer 
A 10-percent DDT dust was less effective than undiluted cryolite. — 
Packard (285). 
