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Psallus ancorlfer (Fieber), an onion seed plant bug 
In early July, in the Willamette Valley, Gesarol A-3 dust was 
applied with a hand duster at the rate of 35 pounds per aore to a 25- 
by 50-foot plot of onions raised for seed* An infestation of 25 to 75 
bugs per seed head was counted before the dust was applied* After 48 
hours there were no live bugs in the dusted blook* A number of dead 
bugs were found down deep in some of the heads* The infestation in the 
remainder of the field appeared to be the same as on the date the dust 
was applied to tfte test plot-- 25 to 75 bugs per head— exoept for a few 
rows just east of the experimental plot, where there were very few live 
bugs and a number of dead ones*— Thompson (34 6)* 
Psallus serlatua (Reut*), the cotton flea hopper 
In experiments in Texas several concentrations and combinations of 
DDT were compared with sulfur and the standard 1:2 mixture of calcium 
arsenate and sulfur for control of this insect* At Port Lavaca, on 
heavily infested plots dusted five times at the rate of 12 to 13 pounds 
per acre, 2 percent DDT gave a reduction in population about equal to 
that given by the 1:2 calcium arsenate- sulfur mixture* At Raymondville 
and Brownsville, on plots dusted once, the reduotion of flea hopper 
populations in 4 to 6 days was about one-third greater from 2*5 and 5 
percent DDT than from sulfur or 1:2 calcium arsenate- sulfur* At Waco, 
plots dusted four times showed no significant differences in population 
between 4 percent DDT, 2 percent DDT, and calcium arsenate-sulfur* The 
yield from each treatment was greater than from the check, the yield 
from the 2 percent DDT being significantly greater than that from the 
calcium arsenate-sulfur but not significantly better -than that from the 
other treatments containing DDT*— Loftin (247 ) • 
Field tests using 3-percent DDT dust at 14 pounds per acre gave 
95*3 percent control for the nymphs and 8*7 percent for the adults* 
Laboratory tests gave oomplete oontrol for both adults and nymphs *-Okla* 
Agr* Bxpt* Sta. (278 ) * 
In the laboratory Gesarol A-3 at a dosage of about 60 mg* in a 
quart fruit jar killed all adults and nymphs* In field tests 14 pounds 
of Gesarol A-3 dust per aore killed 8*7 percent of the adults and 95*3 
percent of the nymphs»— Hamilton (200) * 
One application of 3-peroent DDT dust made July 18 on cotton, at 
the rate of 12 pounds per aore, gave 77 peroent control of fleahoppers 
the first week, 36 percent the second week, and 34 percent the third week* 
This was better control than that obtained with either sulfur or sabadilla 
during the same period*— Hibbs (208 ) * 
Same as for Thrlps tabaol *— Smith (324 ) • 
