~24 
2,000 plants in 9 fields. In Calhoun County there were 0,26 flea 
hoppers per 100 plants, while in Victoria County there were 2.75 
hoppers per 100 plants, or 10.57 times as many hoppers as in Calhoun 
County. ; ox : 
Tarnished plant bug scarce on Texas coe exe sat ihanen the cotton: 
flea hopper (Psallus seriatus Reut, and the tarnished plant bug (Lygus 
pratensis L.) are in some regions frequently numérous.in the same _ 
fields, this is not the case*in the vicinity. of. Port ‘Lavaca, Tex.,, . 
where the flea hopper is a sérious pest nearly every year. K, P, Ewing 
reports that during April no specimen of L. pratensisiwas taken at. 
Port Lavaca, although butterweed was in full bloom and sveepings were 
made from April 4 to 19. He says, "This is.the seme plant that is 
found abundantly in the Louisiana Delta, near Tallulah, and from which 
thousands ae L. pratensis are collected Rem LOO. SWREDS be latter pas 
of April,! 
‘of Bryan, ce mates rere thei ones on the: cobbon. bol Won 
_ experiments conducted last year in the Brazos River bottoms in Texas, 
‘The bollworm (Heliothis obsoleta Fab.). often causes severe danag re..in 
this section exl is usually more important as a.cotton pest then is 
either the boll weevil or the flea hopper. The infestation in 1933 
was light, the maximun percentoge of damaged forms in.tthe check plats 
being 17.5 percent and the maximum fr rfe station by the weevil, with one 
exception, never exceeding 5 percent, Even:under these conditions, 
sufficient control was obtained by dusting with calciun ars enate to 
‘show a profit on all of the plats treated; Six plats receiving 5 
applications of calciun arsenate at 5-day intervals starting with 
bollworm egg deposition,made an average gain per pire of 250 pounds. 
of seed cotton and a profit of $5.60. Two plats receiving 3 applica- 
tions of calcium arsenate, timed from the beginning of egg deposi- © 
tion, increased the yield 118 pounds of seed cotton per acre and gave 
a profit of $2.82 per acre, One plat, receiving 3 applications of 
calcium arsenate delayed 10 days after egg deposition,had begun made 
a gain of only 77 pounds ond a profit of $0.64. Plats dusted with 
ges sulphur and 300-mesh sulphur showed decreases in yield. These 
tests confirm those of previous years and show that bollworm control 
by calcium arsenate dusting is practicable and profitable if done at 
the right time. To determine whether poisoning is necessary and the 
proper time for application is difficult. Egg deposition on cotton 
usually begins when about 90 percent of the corn silks in: the locality 
are dry, and is usually much heavier on succulent cotton that is grow-— 
ing rapidly, <A heavy ege deposition, however, does nat. necessarily 
result in a damaging infestation, as the hatching of the eggs and 
establishment of larvae on cobron fruit depend saphean: upon climatic 
concitions at the time. 
Observations on the bollworm ond boll weevil damage is early 
.and, in late-planted cotton emphasized the value of early planting when 
possible, Although there was little bollworm’ damage: in either the 
