_-nmj3. ■,.■^.■■-.1.^,, - .- - , iVTf, -"»■.-■ r ■■ «r-»--..~-r-g- 1128 



137 



257. , and Parencia, C. R., Jr. 1972. The boll weevil coiuplex In Arizona. 

 U.S. Dep. Agric. Prod. Res. Rep. 139, 24 pp. 



The data from the two eras (1920-30 and 1960) indicate a common conclusion. 

 They show that the thurberia weevil may be a source of infestations, pro- 

 bably minor, in cultivated cotton where thurberia grows adjacent to culti- 

 vated cotton, but the history of relatively minor boll weevil infestations 

 in the Santa Cruz Valley over the years suggests that the thurberia weevil 

 is not a major menace to cultivated cotton. However, the boll weevil's 

 presence in northern Mexico, which was apparently responsible for heavy in- 

 festations in recent years, may be a threat to the top crop produced in late 

 fall in Arizona. Both the thurberia weevil and the boll weevil complex can 

 be controlled with proper sanitation measures applied to the crop residues, 

 particularly preventing the growth of stubbed cotton. Thus although bio- 

 climatic controls are generally adequate to minimize damage to cotton by boll 

 weevils in Arizona, the grower may further minimize the damage with proper 

 cultural practices. 



258. ; Patana, R.; and McAda, W. C. 1969. Developmental periods for boll 

 weevils reared at several constant and fluctuating temperatures. J. 

 Econ. Entomol. 62: 1402-1405. 



Developmental periods of 5 strains of Anthonomus grand is Boheman from 

 cultivated cotton reanged from 88 days at 15''C to 17 days at SO'C; a 

 temperature of 35''C increased the period to 17.5 days. Developmental 

 periods of 1 strain of thurberia weevils, A. grandis thurberiae Pierce, 

 ranged from 72.5 days at 15''C to 17.5 days at 30'*C; a temperature of 35°C 

 extended the developmental period of the weevils to 18.5 days. Temperatures 

 above an undetermined temperature between 30" and 35 "C prolonged the develop- 

 mental period of all strains. The deleterious effect of high temperatures 

 partially explains the absence of boll weevil populations in Arizona in 



