329 



sprays applied early and late in the cotton season provided adequate control of 

 the boll weevil, Anthonomus ^randis Roheman, and the bollworm, Heliothis zea 

 (Boddie) , during 1961-63. Differences in effectiveness of these treatments 

 against th;se insects were not significant. Also, no significant differences 

 in total square or boll production, plant height at harvest, or total yield 

 were found among these treatments. Treatments of methyl parathion + DDT and 

 toxaphene + DDT + methyl parcthion delayed squaring about 5-10 days, and this 

 delay in squaring, resulted .n a corresponding delay in maturity. Thus, the 

 reproductive physiology of co::ton was affected slightly by methyl parathion. 



636. , and Mitchell, E. R. 1966. Attractiveness of isolated groups of 

 cotton plants to migrating boll weevils. J. Econ. Entomol. 59: 39-41. 



Migrating boll weevils, Anthonomus grandis Boheraan, were attracted in consider- 

 able numbers to isolated groups of caged and uncaged fruiting cotton plants. Few 

 to no weevils were attracted to more mature cotton plants. Weevils were able to 

 differentiate between fruiting and immature plants without having to alight on 

 the plants. The distance from which the weevils were attracted was in excess of 

 1 foot. The field-cage technique appeared to offer opportunities for research 

 on the comparative attractiveness of various plant materials and the distances 

 from which weevils are attracted. This technique may be useful also in deter- 

 mining the time and extent of weevil migration. 



637. , and Mitchell, E. R. 1968. Preventive boll weevil control program 

 applied to a ten-square-mile area within a treated county. J. Econ. 

 Entomol. 61: 179-186. 



Three Insecticides applied at 2 dosages and 2 application intervals (3X2X2 

 factorial) were used in a preventive boll weevil, Anthonomus grandis Boheman, 

 control- program consisting of 3 or 4 early-season applications beginning at the 

 8-leaf stage of cotton growth plus late-season applications beginning the last 



