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were than heaTily dusted. Observations at 24, 48, and 72 hours reveal- 
ed no dead bugs* This treatment was repeated four tines with similar 
results* Other areas were treated with a 20-percent DDT spray material, 
but no adults or nymphs were killed* The end of a vine was heavily 
dusted and 15 adults, 16 last-instar nymphs, and 25 young nymphs were 
placed on the vine in a cage. At the end of 48 hours only 1 newly emerged 
adult had died, while nymphs hatohing from an egg mass were aotive*— 
Gould (184 ). 
A 3-percent DDT dust and a spray containing 1 pound of DDT in 100 
gallons of water were tested in preliminary small-plot field experiments 
on cucurbit crops* DDT spray and dust gave fair control of early-instar 
nymphs of the squash bug* DDT treatments caused severe plant injury to 
young acorn squash, cantaloups, and cucumbers. The yield of Hubbard 
squash was reduoed by application of DDT. — H. J* Agr* Expt. Sta* (275) • 
DDT applied as a dust, or as a spray, either in the form of a suspen- 
sion or an emulsion proved unsatisfactory against adult squash bugs* 
The zylane-Triton emulsion of DDT (20 parts DDT, 60 parts xylene, and 20 
parts Triton X-100) caused marked terminal and marginal injury of squash 
plants for all concentrations of DDT above 1 per cent ♦— Ha vi land (204) • 
Leptocoris trlvtttatus (Say), the boxelder bug 
Spraying the sides of a heavily infested house with 1 pound of DDT 
(20 percent DDT-80 percent talc) in 100 gallons of water eliminated the 
pest for about 1 week*— H* J* Agr* Expt* Sta* (275 ) • 
Leptoglossus phyllopus (L*), the leaf -footed bug 
This bug occurs in thousands on oowpeas in Mississippi in late sum- 
mer. Tests were made in which cowpea plants were placed in screened 
cages, together with 25 adult insects* All the insects died within 4 
days when both plant and bugs were dusted with 3 percent DDT, and 24 
died within 9 days when the plant only was dusted or sprayed (l pound 
DDT in 100 gallons of water) with DDT* In other tests a 2 percent dust 
applied directly to the adults killed 70 percent in 24 hours and 85 per- 
cent in 48 hours*— Lyle (249) , 
Lygaeidae 
Blissus leucopterus ( Say) , the chinch bug 
Fifty chinch bugs were placed in a cage with a film of 3-peroent 
DDT dust on the bottom* After 2 hours the oust caused a mortality of 42 
percent, after 4 hours 69 percent, after 5 hours 89 percent, and in 6 
hours 100 peroent*— Hibba (208)* 
