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Ih laboratory teats foliage was dusted in a bell jar settling cham- 
ber and adults were placed on treated host plants, which were changed 
daily. In 48 hours the kill for Gesarol A-3 dust (3 percent DDT) was 
95 percent, for Neocid (10 percent DDT) 92 peroent, and for the check 
34 percent*— Ross (506 )* 
In laboratory tests vapo-eprays with 1*2, 2*4, and 3*6 peroent of 
DDT were effective when applied to plants on which adult Lygus bugs were 
subsequently placed or when applied directly on the insects* Four to 
eight days were required to kill all the bugs*— Lange (242 ) * 
Lygus oblineatus (Say), the tarnished plant bug 
In tests on caged cotton plants 2*5, 5, and 10 percent DDT gave 
excellent kill of this species and other Lygus bugs* In field tests the 
results against the tarnished plant bug were somewhat erratic and oontrol 
was not so consistent as in cage tests* Control of mixed populations of 
the tarnished and rapid plant bugs (Adelphocoris rapidus (§ay)) in field 
plots at Tallulah, La*, was poor in most instances after six dust appli- 
cations of 2*5 or 5 percent DDT* In Arizona, in a small-plot experiment 
at Mesa, seven applications of DDT-pyrophyllite-sulfur (4s 36 « 60) with 
hand guns resulted in a gain of 1,018 pounds of seed cotton per acre, or 
42 percent more than the check, as compared with 13 to 26 percent from 
four arsenical- sulfur mixtures* Cage and field tests indioated that 2 
peroent DDT was not so effective as 4 or 5 percent DDT, and the addition 
of sulfur to the DDT dusts caused a quicker kill of plant bugs and stink- 
bugs.— Loftin (247). 
In greenhouse tests 8 ounces of DDT (powder suspension) in 100 im- 
perial gallons of water gave high kills both by direct contact and as a 
residual poison on the foliage* In a large-soale test 16 ounces of DDT 
(in Velsicol emulsion) apparently gave complete protection to chrysanthe- 
mums and eliminated the infestation within 4 or 6 days* Adults in the 
check lived for over a month* On asters in nursery rows Gesarol A-3 
dust (3 percent DDT) applied 10 times between July 10 and August 23 gave 
good but not perfect protection*-- "Ross (306) * 
In the laboratory Gesarol A-3 dust controlled both adults and nymphs 
by the end of 20 hours but aqueous spray was only 87 peroent effective.— 
Hamilton (200 )* 
In laboratory tests a 3-percent DDT dust gave oomplete control in 
20 hours* A 1-percent aqueous spray gave 87 percent control in 20 Hours* 
— Okla* Agr* Bxpt* Sta. (278 )* 
Same as for L* ellsus *— 3lhite (373 ) • 
This bug responded to DDT treatments usually by highly significant 
differences between means*— Granovsky (187)* 
