In late June overwintered boll weevil populations were considerably lower 
in the treated than in the untreated communities, as shown in table 8. The 
5-day interval treatment at Barnes gave a better reduction of overwintered 
populations than the 7-day interval at Bear Lake from June 2 through June 23. 
However, on June 30 the results were reversed. The square infestation was 
very similar in both interval treatments, although it was slightly higher in 
the 5-day interval treatment at Barnes in late July and early August. The 
square infestation in both early-treated communities was much lower than in 
the untreated communities. Infestations were injurious in the latter area 
after July 1). Late-season treatment in the early-treated communities was 
not begun until August 15. The infestation averaged 10-percent punctured 
squares in both these communities when late-season treatment started. In the 
untreated communities, late-season treatment was begun on August 1 for Quebec, 
and treatment begun in July for Barnes was inadequate. 
Table 8.—Overwintered boll weevil populations and infestations in early- 
treated and untreated communities, Tallulah, La., 1961 
Number of weevils per acre 
for week See 
Percent punctured squares 
for week ending— 
aa ee 
eee 
ee dale LLL 
Bear Lake -~- 167] 38 (ui 12 ul 1 2 







SERS oo | ae lee | oe ee eee 
Untreated: 
Quebec -2==== 36 33 35 | 38 
Barnes -=-==— 36 We OO Be 
Average -- 
EEE EAE 
Four small farms at Quebec were used in the fall-treatment program. The 
area is surrounded by timber. Methyl parathion at 0.5 pound per acre was 
applied on September 28 and October 10, 18, and 27, when a killing frost occur- 
red. Two small farms beyond the timbered area were used as checks. 
Both areas had some late-planted fields, which were fruiting heavily in 
late September and boll weevil populations were heavy. Just before fall treat- 
ments were begun, populations were slightly lower in the treated than in the 
untreated area, as shown in table 9. Also, 2 and 56 percent, respectively, 
of the weevils were in diapause, even though farmers had applied calcium 
arsenate or methyl parathion plus DDT dust until the determinations were made. 
manos 
