In the three communities where the early-season control applications were 
not made, late-season applications were begun in mid-July. At Sharkey, where 
a fairly good schedule with calcium arsenate or methyl parathion plus DDT dust 
was maintained, the seasonal average boll weevil infestation was considerably 
higher than in the three communities where the early-season applications were 
made. Bollworm infestations were similar in all areas. At Barnes and Bear 
Lake, where irregular and rather ineffective late-season applications were made, 
the boll weevil infestation was severe throughout the season. The seasonal 
boll weevil infestation averaged 7-percent punctured squares in the treated 
communities and 33.7 percent in the untreated communities. The bollworm square 
injury averaged 2.7 and 2.5 percent, respectively. 
Fall Treatments 
Only Hunter's Bend and Houston Ridge received the full schedule of fall 
treatment with methyl parathion. These treatments were made at weekly intervals 
from the time the crop no longer needed protection from insects until killing 
frost occurred. Quimby received only two such applications, which were made 
by the farmer. 
Weevil population records were determined from mid-September through 
October at Hunter's Bend and Houston Ridge. A few records were obtained at 
Quimby and Sharkey. Weevil samples were collected during the same period and 
were submitted to the Stoneville laboratory from Houston Ridge and to the 
Baton Rouge laboratory from Hunter's Bend for diapause determinations, For 
the remainder of these studies, diapause determinations were made at the 
Tallulah laboratory. Ground-trash examinations were made after frost in all 
five communities except Sharkey. Results are given in tables 3-5. 
At Hunter's Bend four to six applications of methyl parathion at 0.5 pound 
per acre were made in the various fields between September 1); and October 28. 
Most fields received one to three applications of a defoliant during this 
period. In some instances, combination insecticide-defoliant applications were 
made. These treatments reduced the boll weevil population to fairly low levels. 
However, the incidence of diapause during treatment was fairly high, averaging 
32.8 percent. Weevils found in ground trash after frost averaged 77); per acre 
as compared with 5,0 at Barnes and 10,028 at Bear Lake, where no fall treat- 
ments were made, 
At Houston Ridge five applications of methyl parathion at 0.5 pound per 
acre were made between September 20 and October 25 for fall boll weevil control 
One application of a defoliant was also made. DDT at 1.0 pound per acre was 
included in the first three applications. These treatments reduced field 
populations to low levels. Diapause incidence averaged only 6.2 percent. No 
weevils were recovered from ground trash. 
At Quimby only two applications of methyl parathion were made on October 3 
and 10. Field populations were fairly high. Limited determinations indicated 
that diapause incidence averaged 36.8 percent. Ground-trash examinations 
showed an average of 1,152 weevils per acre, which was higher than at Hunter's 
Bend and Houston Ridge, but considerably less than at Barnes and Bear Lake. 
Ge 
