At Sharkey, which did not receive fall treatment, field populations were 
high. Records were not made at Barnes and Bear Lake. Limited determinations 
indicated a diapause incidence of 8 percent at Sharkey and 80 percent at 
Barnes. 
Ground-trash examinations were not made at Sharkey after frost. High 
populations were found in ground trash at Barnes and Bear Lake, averaging 
De Oh and 10 ,028 weevils per acre, respectively, as compared with the Madison 
Parish average of 6,860 and with the Hunter's Bend and Houston Ridge averages 
of 77) and 0. Ground- trash examinations in March also showed a marked reduc- 
tion in surviving weevils in treated over untreated communities, averaging 65 
and 1,291 weevils per acre, respectively, or almost 20 times as many in the 
untreated as in the treated communities. 
In table 6 boll weevil populations in May and June 1961 were considerably 
lower in the communities treated the previous fall. No data are given for 
Barnes because cotton was planted late. 
Table 6.—Boll weevils per acre in spring of 1961 in 1960 fall-treated and 
untreated communities, Tallulah, La. 
Week ending ey Pee ee we ee eens as 
Community 
Sete 
a wo a oe Number ws mS 
Treated: 
Hunter's Bend--- 0 38 80 
Houston Ridge--- 6 19 6) 
Quimby ---------- : 250 75 
1/ Treated with Guthion after June 9. 
Experiments in 1961 
Three boll weevil control programs were compared in 1961, as shown in 
table 7. In the first program, fields at Hunter's Bend and Houston Ridge 
received 1960 fall and 1961 late-season treatments. They were treated 10 
times from July 12 through September with methyl parathion and with methyl 
parathion plus DDT at 5- and 7-day intervals. In the second program, fields 
at Quebec received only late-season treatment in 1961. Applications of methyl 
parathion plus DDT were made seven times between August 1 and September 20. 
aioe 
