83 



ducted in other cotton growing areas. Two distinct periods (spring and fall) 

 were observed. The long range movement (10 to 13 miles) in the fall indicated 

 that migration is occurring in Tennessee. Late-season or boll weevil diapau;:e 

 control programs must be designed to allow good isolation (ideally 50+ miles, 

 since the boll weevil has been known to fly A5 miles) from untreated cotton, 

 since the boll weevil is capable of dispersing for great distances. 



153. ; Bryan, J. M. ; and McCutchen, T. C. 1974. Boll weevil management 

 studies. Tenn. Farm & Home Sci. Prog. Rep. 90: 32-34. 



There were no significant yield increases in plots where insecticide applica- 

 tions were begun at the standard 10% boll weevil infestation level compared to 

 the 20, 30, and 35+ percent levels. Therefore the Tennessee cotton grower may 

 be abl to save on his boll weevil control costs by using fewer applications 

 when in'^estation levels are lower. The data reported here are preliminary and 

 2 years' additional data under different insect and environmental conditions are 

 needed before valid recommendations can be made. If the same trend exists after 

 this period, the initial infestation level to recommend boll weevil control can 

 be raised. 



154. ; Connell, J. M. ; and McCutchSn, T. 1973. Boll weevil control with 

 -="-—frego bract cotton. Tenn. Farm & Home Sci. Prog. Rep. ^7: 10-11. 



Oviposition suppression was higher in the areas where the overwintered boll 

 weevil populations were lower. Boll weevil populations, using oviposition 

 as an indirect measure of population, were controlled by the resistant 

 character frego without insecticides at Milan and Jackson for the whole season 

 and until late season at Ames. Plant bug damage to frego cotcon was evident 

 althoughrthe relative numbers present were not significantly higher than on 

 the normal cotton. It was evident that boll weevil populations could be 

 suppressed vith a resistant character such as frego. The use of this type 



-r-rir-wsssas; 



