235 



A53. , and Sterling, W. L. 1979. Temperature thresholds for spring emer- 

 gence and flight of the boll weevil. Environ. Entomol. 8: 1118-1122. 

 A strong relationship v;as found between temperature and emergence of boll weevils 

 from overwintering sites. The threshold temperature above which overwintering 

 weevils accumulated heat units was 10.85" ± 1.3°C. Early fall cohorts required 

 a higher number of accumulated heat units than did late fall cohorts. First- 

 emerging weevils of early cohorts had a lower tendency to subsequently initiate 

 flight activity than did first-emerging weevils of later cohorts. The tempera- 

 ture threshold for flight of 95-98% of newly emerging weevils was 20°C. 



A54. Jones, J. E.; Weaver, J. B., Jr.; and Schuster, M. F. 1978. Host plant 

 resistance of the boll weevil. l£ Boll Weevil: Management Strategies. 

 South. Coop. Ser. Bull. 228, pp. 50-73. 

 Host plant resistance to the boll weevil is available in several cotton 

 genotypes. Furthermore, several of the resistant characteristics have been 

 transferred successfully into agronomically desirable cottons. The com- 

 merical use of these cottons is now largely a matter of integrating them 

 into appropriate pest management schemes. Frego Bract, redleaf and red 

 stem, and okra leaf and super-okra leaf are available resistance traits. 

 Male sterility and reduced anther numbers are traits that hold considerably 

 promise of seriously disrupting the biology of the boll weevil. These 

 traits as well as the boll weevil oviposition-snppression factors present 

 in some G. hirsutum race stocks and G^. barbadense strains, must be considered 

 as traits of potential value at this time, since each will require additional 

 breeding and testing studies to fully determine its potential usefulness in 

 boll weevil management programs. 



455. Jones, J. W. ; Bowen, H. D.; Stinner, R. E.; Bradley, J. R., Jr.; and 



Bacheler, J. S. 1977. Simulation of boll weevil population as influenced 



