Table 13.—Overwintered boll weevil populations and infestations in fall- and 
early-season-treated and untreated communities, Tallulah, La., 1962 
Percent punctured squares 
Number of weevils per 
acre for week ending for week ending— 
Sea ae ee | June | eae Oe Se Se LY Sees ie ee August 
Ltt BARE eR eee Cee 
Treated; 
Quebec---425 OFiie On o 
Untreated: 
Edgerton--- 20.01/19 .0 
Discussion 








In 1960, control of overwintered weevils was good in all treated com- 
munities, However, better results were obtained at Houston Ridge and Quimby, 
where planting and treatment schedules were uniform, Variation in planting 
dates at Hunter's Bend resulted in varied treatment and in somewhat poorer 
weevil control. It was unfortunate that bollworm control measures became 
necessary so soon after the early-treatment period. Boll weevil control 
could have been delayed for additional weeks, especially at Houston Ridge and 
Quimby. In late-season treatments, somewhat better control of overwintered 
boll weevils was obtained at Houston Ridge and Quimby because of uniform plant- 
ing and treatment schedules and because the same insecticides were used through- 
out both treatment periods. The use of various insecticides at Hunter's Bend 
probably accounted for less efficient control. 
Early-season treatment followed by late-season and fall treatments reduced 
the number of weevils in hibernation in ground trash considerably over com- 
munities receiving only late-season and fall treatment. The population in 
ground trash in the spring in the untreated communities was almost 20 times 
that of the treated communities. This was also reflected in early summer in 
field populations, which were considerably lower in the treated communities. 
In 1961, the most effective boll weevil control program was one where 
early-season plus late-season treatments were used. The next most effective 
program was where treatment was made the previous fall followed by late-season 
treatment beginning in July. The least effective program was one in which 
only late-season treatment was used. 
Comparative control of overwintered boll weevils with 0.25 pound of 
Guthion applied at 5- or 7-day intervals was very similar, Infestations were 
much lower than in untreated communities, and late-season treatment was not 
needed until 1 month after such treatment was started in the untreated 
communities. 
aie 
