Experiments in 1962 
Spring ground-trash examinations and overwintered-population and square- 
infestation records were made in 1962 at Quebec and Edgerton. At Quebec, 
fields received fall treatment in 1961 plus early-season treatment in 1962. 
Edgerton received late-season treatment beginning on July 17, 1962. Results 
are shown in tables 12 and 13. 
Weevil populations in ground trash in the untreated community were almost 
four times those of the treated community in the spring. 
Overwintered boll weevil populations also were low on cotton in the 
spring in the treated community. Four spray applications of Guthion at 0.25 
pound per acre were begun on June 12, when plants began producing pinhead 
size squares, and were completed by July 3. No punctured squares were found 
in the treated area on July 6. The infestation remained very low for 6 weeks 
after the early-season treatment period. Most of the crop was set during this 
time. Three weeks after the last early-season application an injurious boll- 
worm infestation developed. Because the boll weevil infestation was low, two 
spray applications of DDT alone were made for bollworm control in the last 
week of July. Parathion at 0.125 pound per acre was included in the second 
application for cotton aphid (Aphis gossypii Glover) control. Three late- 
season applications were made for boll weevil-bollworm control between August 
15-31. The bollworm was of major importance. Late-season treatment began in 
the untreated community on July 17 and continued throughout the remainder of 
the season, 
Table 12,.—Boll weevils per acre in ground-trash examinations in fall-treated 
and untreated communities, Tallulah, La., 1961-62 
Fall of 1961 Spring of 1962 
Quebec ---------- hi6 


Survival 






Percent 
Untreated: 


Edgerton 
= 41g 5 
