Li laboratory tests an the chlnoh bug the peroentage of mortality 
inoroased with the amount of DDT used* Adults were more susoeptible 
than nymphs* Under unusually heavy dust applications for field con- 
ditions, control was only 14*9 percent of the nymphs and 81*1 percent 
of the adults •--Hamilton (200). 
The results of laboratory and field tests seem to show that al- 
though DDT is toxic, the aotion is slow and not comparable to dinitro-o- 
cresol* A mortality of 100 percent was obtained 1 hour after colleot-*" 
ing adult and fifth-instar bugs that had walked through a 1 percent di- 
nitro-o-cresol dust barrier* Only a 33-percent mortality was obtained 
24 hours after collecting bugs that had walked through a 6-peroent DDT 
oust barrier* A 10-peroent DDT dust applied direotly to adult chinoh 
bugs killed 90 percent in 24 hours*— Decker (131) * 
In field test 8 in Indiana barrier lines of dust containing 5 per- 
cent or more of DDT in pyrophylllte, applied at the rate of about 1 
pound per rod, gave excellent protection of corn from immature chinch 
bugs migrating to it on foot from adjaoent wheat* The dust did not act 
as a repellent or prevent some of the bugs from reaching the oorn, but 
it killed "tii em before they were able to injure the corn materially. 
Heavy applications of dusts containing 1 to 5 percent of DDT in 
pyrophylllte directly to the infested portions of the corn plants and 
the surface of the soil close to them gave excellent control of the bugs 
without discernible injury to the plants*— Packard (285 ) * 
A 3-peroent DDT dust was ineffective.— Has eman (203). 
Laboratory tests gave good control only when 3-peroent dusts were 
applied heavily* Adults are more susceptible than nymphs.— Okla. Agr* 
Bxpt. Sta. (278)* 
Oncopeltus fasciatua (Dall.), the large milkweed bug 
Same as for Melanoplus f erour-rubrum .— AIF (66) • 
Mirldae 
Adelphooori8 lineolatus (Goese) 
See Lygus oblineatus *— Oranovsky (187 ) • 
Adelphooorls rapidus (Say), the rapid plant bug 
See Lygus oblineatus *— Granovaky (187 ) j Loft in (247 ) • 
