ANNl AL Ki:i'(»k l S OF I »i:i'AK IMKNT ( >F A( JKK ULTrUi:. 1«J37 
creases in yield were secured with f<jur aiiplicatioiis of talciiiiii arsenate at 
5-day intervals, be^inninj; shortly after the first egg deposition on cotton. 
Calcium arsenate gave more effective c<jntrol than a mixture of 'JO i>ercent of 
sulphur and 10 percent of pyrethrum, while the tests ou increasing the arseni- 
cal content of calcium arsenate by adding or 10 i)ercent of paris green and 
on decreasing the arsenic hy mixing with lime or sulphur were inconclusive. 
In hibernation cages the numlier of moths emerging from overwintering 
pupae was greater in well-drained Lufkin fine sandy loam and Norfolk fine 
sand than in lUackland t)r Ura/.os Kiver boiiom soils; the ditTereiK es in survival 
vcre not so great. liowev<'r. where the soils were more moi^l. 
IMNK BOLLWORM CONTROL 
The more important developments in the pink l)ollworm situation during 
the 1!)30 crop season were the finding of a new infestation in the lower 
Kio Grande N'alley in both Texas and Mexico; the finding of reinfestatiou in 
several additional counties in the Texas Panhandle after a lapse of several 
years; and no recurrence of infestation in northern Florida for the second 
consecutive crop season. 
The infestation in both of the alcove areas is very light. In the lower Uio 
Grande Valley of Texas four counties are involved, and they were i)laced under 
regulation on August IT. ly.'it;. In the Texas I'anhandle rive counties are in- 
volved ; a portion of two of the counties, however, was already in the regu- 
lated areas. This new territory was placed under regulation ell<'ctive Decem- 
ber 1, 1936. In both of the above instances it was necessary to include one 
or more counties in which no infestation was found. This was due to the 
fact that seed cotton is moved through such counties for gintiing without 
regard to county lines. The Florida area was released fnun regulations 
effective October 14, 1930. 
NEW INFESTATION IN LOWER RIO GRANDE VALLEY 
The harvesting of the cotton crop in the lower liio Grande Valley takes 
place much earlier than in any other section of the Cotton Belt. Ou August 
6, 1936, gin-trash inspection was begun at ^latamoros. Mexico, just opi>osite 
Brownsville, Tex. In the first sample of trash inspected specimens of the pink 
bollworm were found. Thereafter worms were found almost daily in trash 
from all gins in the Matamoros section until August 15. at which time insiKK?- 
tions were discontinued. A total of 235 pink boUworms were submitted for 
identification, in addition to some 20 or 25 worms which were turned over to 
INlexicMU agricultural inspectors at their re<iuest. At lleynosa, Mexico, about 
50 miles up the river from Matamoros. eight specimens of the pink bollworm 
were found, the first on August 12. These are the only two hxations on the 
Mexican side of the river at which gins were operated. In the meantime, 
following the first finding at Matamoros. additional gin-trash machines had 
been sent to the valley to work on the Texas side. These machines began 
oiK^rating on August 10. 1930. and on the following day the first siK'cimen of 
the pink bollworm was found at Brownsville. During the next few days 
three additional specimens were found at that place. On August 12 the first 
specimen was found at San lienito, and when inspections had been completed 
19 specimens had hevu found at that location, but later in the sea.s(m several 
additional si)ecimens were found by regulatory inspectors, l^oth of the above 
places are in Cameron County. The only other linding in the valley was at 
Rio (irande City, Starr County, one i)ink bollworm being found on .Vugust 15. 
i)n August 17. 19.'{0. the i)ink bollworm (piarantine was amended to add the 
counties of Cameron. Hidalgo. Starr, and Willacy to the lightly infested areas. 
While no specimens were found in Hidalgo and Willacy Counties, it was neces- 
sary to include them, as seed cotton is moved throughout the f«»ur coimlies for 
ginning without regard to (•<»unty lines. Api)roxiniately 2r»(i.o<M» acres were 
I»Iante(l to cotton in the four counties. 
When the area was luoughl under r(\gulation the bulk of the cotton crop 
had already Ixmmi harvested. Tlu-re was only one oil mill in the area, conse- 
quently a considerable volume of seed was moving to other nulls in southern 
Texas. Inimedialely after the first specimen was found no seed was allowed 
to leave \\\o valley until several mills which desired to <'ontinue receiving 
seed installeil sterilizt-rs. after which tlu^ seed was a!low(Ml to move to these 
mills. an<l immediat«'ly ujMtn arrival was heated to 155° F. The lint was 
compres.sed at the two plants in the area or allowed to move to designated 
plants at Corjius Cliristi for treatment. It shoidd be stated that all persons 
and firms involved cooperated whoh'heart(Mlly in carrying out the above treat- 
ment, even though no regulations were in t'ffect when they were first l>egun. 
