/ ' 



'^'t'X'^' -^v'-^-^r y^f. .,— ^;y; ^» j;^f* aj r\.-jg.-7rw;^'* • - --TrtWA?^'*-Sj^*7w'^/«-^V'*'^"'''T>>?'%V^^y ^'^^?^%**7-*^'^ 



363 



711. ; Earle, N. W. ; and Villavaso, E. J. 1978. Effect of release time 

 on recovery of tagged irradiated boll weevils. J. Econ. Entomol. 



71: AOl-402. 



32 

 Irradiated Anthonomus grandis Boheman, tagged with P, were hand-released 



in cotton fields during the morning, noon, and evening. Equal numbers of 



boll weevils were recovered irrespective of release time. Within 1 day 



after release, ca. 1/3 of all released weevils had disappeared from the 



field; by the Ath day, only 38.0% live weevils were recovered. Tagging 



did not reduce surviva.'' of irradiated weevils. 



712. , and Villavaso, E. J. 1979. Measuring sperm competition in the boll 

 weevil by the use of females whose spermathecae have been surgically 

 removed. Ann. Entomol. Soc. Am. 72: 500-502. 



A test was devised by which sperm competition could be measured directly in 

 boll weevils, Anthonomus grandis grandis Boheman. Spermathecae were surgically 

 removed from the females, and these females were allowed to mate with irradiated, 

 then non-irradiated males and vice versa, with only 4 h separating the matings. 

 By this method, we could use egg hatch data to measure sperm competitiveness 

 without being concerned about the unknown effect that sperm stored in the 

 spermatheca would have on egg hatch. Sperm from both types of males were 

 found to be "equally competitive. The presence or absence of the sperma- 

 theca apparently had no effect on egg hatch during the 1st 5 days mating. 



713. Niles, G. A.; Harvey, L. H.; and Walker, J. K. 1978. Cultural control 

 of the boll weevil. In Boll Weevil: Management Strategies. South. Coop. 

 Ser. Bull. 228, pp. 23-38. 



Four decades cultural techniques have been advocated and practiced as key 

 elements in control and management of the boll weevil ( Anthonomus grandis B) . 

 Since the advent of the boll weevil in the 1890' s a wide variety of cultural 



