282 



free check excluded) of the squares. Seed cotton harvested from the respective 

 treatments averaged 2902, 1875, 1678, 1318, and 847 lb per acre. Differences 

 in lint quality were detected between plots infested with 100 overwintered 

 weevils per acre and those infested at the other 4 levels. These differences 

 were observed in the first and third harvesting in 1961. No other quality 

 differences were observed. 



536. ; Merkl, M. E.; Tingle, F. C; Scott, W. P.; Hardee, D. D.; and 



Davich, T. B. 1972. Evaluation of male-baited traps for control of boll 

 weevils following a reproduction-diapause program in Monroe County, 

 Mississippi. J. Econ. Entomol. 65: 552-555.. 

 In the spring of 1969, male-baited traps for Anthonomus grandis Boheman were 

 placed around ca. 4000 acres of cotton in a large-scale field test in Monroe 

 County, after completion of a voluntary grower-sponsored reproduction-diapause 

 control program the fall of 1968. The few fields that had not been treated 

 produced a population of weevils which varied from field to field. Wliere 

 overwintered boll weevils numbered less than 5 per acre, the trap efficiency 

 was estimated to be 93%, but it dropped to 21% when the populations averaged 

 about 300 weevils/acre. Differences in the number of overwintered boll weevils 

 collected per trap were not signif icant'^hen 1, 2, 4, and 8 traps per acre were 

 ^^••^•^©mpareQ. However, significantly more overwintered boll weev^^ls were found in 

 the fields with 8 traps per acre than in fields with 2 traps per acre. Inter- 

 field movement of overwintered weevils from the fields that had not been 

 treated with the untreated fields. Interfield movement of overwintered weevils 

 from the fields that had not been treated appeared to be restricted to those 

 fields that shared overwintering sites with untreated fields. Some fields 

 were treated with insecticides in July for control of Ist-generation boll 

 weevils, but many fields did not require treatment until early August. 



