84 ANNUAL REPORTS OF DEPARTMENT 01 AGgU (LTURE, 194 
of plants would result in a lower overwintering population and that 
in consequence, fewer moths would emerge from hibernation early 
in the season to infest the 1 * ^ * > crop. The State of Texas issued a 
regulation prohibiting the planting of cotton on the Texas side until 
April 20, and a >imilar regulation was enacted on the Mexican side. 
Afi a result, there wa> a period of warm weather while the moths from 
hibernating larvae were emerging but no cotton upon which they 
could lay their eggs. The only clean-up in 1938, followed by the host- 
free period in the spring of 1930, proved of enormous benefit, as 
infestation did not develop to a damaging extent in the 1939 crop. 
Owing to cultural and other practices it was possible to make a rela- 
tively early clean-up again in 1939, and planting was delayed in the 
1940 crop until April 20, as was the case in 1939. 
ARIZONA 
An intensive clean-up in the Gilbert area of Arizona following 
the harvesting of the 1938 crop had significant results, as indicated 
b} T the absence of appreciable infestation in that region for the 
1939 crop. A similar intensive clean-up was conducted in the Glen- 
dale section of the Salt River Valley, following the finding of a 
rather heavy infestation in a limited area in that section in the 1939 
crop. The State of Arizona again participated in the clean-up in 
the Salt River Valley in the vicinity of Glendale. as they had done 
the previous }'ear near Gilbert. To carry forward the advantage 
gained in the reduction of the pink bollworm population in the Salt 
River Valley, a program was inaugurated in the spring of 1939 
through the cooperation of the Agricultural Adjustment Ad- 
ministration of the United States Department of Agriculture and 
the State of Arizona whereby all stub or volunteer cotton had 
to be destroyed by the owners of the land prior to May 10, 1940. The 
destruction of this stub or volunteer cotton prevented it from serv- 
ing as a host for the pink bollworm early in the season before the 
1940 planted cotton became available for oviposition by moths. All 
growers having an A. A. A. allotment cooperated, and it was neces- 
sary for the Federal and State Governments to destroy stub cotton 
on less than 1,000 acres upon which there was no A. A. A. allotment. 
QUARANTINE ENFOR4 EMBNT 
TREATMENT OF PRODUCT'S FOR CKK I 1 1 K A HON 
A total of 765,235 bales of cotton were produced at the 44S gins 
located in the pink bollworm regulated areas of Arizona. New Mex- 
ico, and Texas, and IVh'i.ss-J tons of seed were sterilized in compliance 
with State and Federal pink bollworm regulations. The 41 oil 
mills within the areas handled 276,174 tons of seed. The 12 com- 
presses under supervision compressed 610,448 bale- of lint in com- 
pliance with the pink bollworm regulations. Cotton [inters in the 
amount of lT.Slif) bales were treated by passing the lint bat between 
steel rollers so as to crush any insects which might be present 
therein. Three hundred and thirty-five bales of Mexican linters 
were fumigated upon arrival in the United States, under the super- 
\ 181023 of the Division of Pink Bollworm Control. It is believed that 
llie strict Supervision of the processing and treatment of cotton 
