At Quimby four spray applications of Guthion (0, a imethyl S-()-oxo-1, 
2 ,3,-benzotriazin-3-(}H)-ylmethy1) phosphorodithioate)2 at 0.25 poun® per 
acre were made between June 29 and July 18. The population averaged 50 weevils 
per acre when treatment began. Although further populations were not recorded, 
the infestation averaged 3-percent punctured squares on July 9, and none were 
recorded during the last 3 weeks of July. 
At Sharkey the overwintered weevil population averaged 25 per acre on 
June 23. Cotton had not been planted in the community the previous year. 
The infestation was considerably higher during July than in the treated 
communities, averaging 21.3-percent punctured squares. 
At Barnes the overwintered weevil population averaged 169 per acre on 
June 23. The infestation during July averaged 20-percent punctured squares, 
which was considerably higher than in the treated communities. 
Overwintered weevil populations were not determined at Bear Lake. How- 
ever, the infestation averaged 26.3-percent punctured squares in July, which 
was considerably higher than in the treated communities. 
Late-Season Treatments 
In these communities about 2 weeks elapsed between the time that early 
treatment was discontinued and late treatment was begun. Injurious bollworm 
infestations made late-season control necessary at this time. An insecticide 
to control boll weevils was added to DDT to keep infestations at low levels. 
The cost of its inclusion was minor. lLate-season control was inadequate at 
Barnes and Bear Lake. 
In late-season treatments, the fields at Hunter's Bend received 7 to 12 
applications for bollworm-boll weevil control between July 20 and September 13. 
Beginning treatment dates varied from July 20 to 30 in the various fields. 
Methyl parathion, methyl parathion plus DDT, and toxaphene plus DDT plus methyl 
parathion sprays, and toxaphene plus DDT and methyl parathion plus DDT dusts, 
were the most commonly used materials. Late-season insect control was satis- 
factory in this community. The boll weevil infestation was held below injurious 
levels, although the number of punctured squares gradually increased as the 
season advanced. Good bollworm control was maintained. 
Fields at Houston Ridge received 11 applications of methyl parathion plus 
DDT dust or spray between July 25 and September 16. Good boll weevil and 
bollworm control was maintained. 
At Quimby nine spray applications of 0.25 pound of Guthion plus 1.0 pound 
of DDT per acre were made between July 29 and September 16. The boll weevil 
infestation was held at low levels and bollworm damage was kept to a minimum, 
although infestation pressure was considerable during August and early September. 
By Mention of a proprietary product in this report does not ‘constitute a 
guarantee or warranty of the product by the U.S. Department of Agriculture and 
does not imply its approval by the Department to the exclusion of other pro- 
ducts that may also be suitable. 
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