-110- 
Spllonota ooellana (D. and S.), eye-spotted budmoth 
Tn Nova Scotia one summer application of DDT 1 pound (powder suspen- 
sion) per 100 imperial gallons of water gave much poorer control than 
Black Leaf 155 and appeared to be no better than lead arsenate* At Simcoe, 
Ontario, a similar spray reduced the injury from 38#4 peroent in the check 
to 24«0 peroent when only the undersides of the leaves were covered, and 
to 21.8 percent where both surfaces were sprayed,— Ross (306 ) « 
Fhalaenidae 
Ceramioa plcta (Harr«), zebra caterpillar 
Gesarol A-3 duet (3 percent DDT) applied to one-third to one-half 
grown oaterpillars on oabbage plants caused all larvae to leave the plants 
and killed at least part of them within 22 hours, both when the dust was 
applied to the larvae on the leaves and to the leaves only. Dusting 
with talc alone caused very few larvae to leave*— Ross (306). 
Feltia subterranea (F.), the granulate cutworm 
See Diaphania nitidalis ♦— Cartwright (108 ) • 
Alabama argillacea (Hbn.), the cotton leafworm 
DDT was of no practical value for oontrol. At the Waco, Tex., 
laboratory, the median lethal dosage of a DDT suspension applied to the 
dorsa of fifth-instar leafworms was 61.5 mg. per gram of body weight, or 
206 times as great as that for the bollworm. In field tests 3 or more 
applications of approximately 16 pounds per acre of 1, 2, 4, and 8 per- 
cent DDT dust applied with hand dusters at '"Faco, and 4 percent DDT dust 
applied by airplanes at Bryan, Tex», failed to prevent defoliation of 
plants. Field plots at Tallulah, La«, were defoliated following 5 appli- 
cations of 5-peroent DDT dust. At Presidio, Tex., where 8 to 10 heavy 
dust applications were made for the pink bollworm, DDT gave considerable 
control of the leafworm. At Waco cotton plants sprayed six times with 
DDT suspension at the rate of # 64 pound of DDT per acre-application 
caused a greater reduction of leafworms than plants dusted with the same 
dosage, but neither treatment prevented almost complete defoliation.- 
Loftin (247)* 
DDT is not so effective as the arsenioals. We may be able to over- 
come the leafworm with a combination of DDT with an arsenical.— Annand 
<££>. 
Autograph a sp. # a looper 
There was some indication that DDT in oil applied as a vapo-spray 
was effective at high concentrations.— Lange (241) . 
