135 



with temperatures >38''C impose a strong bioclimaf.ic control on the boll weevils 

 until late season, when shading by maturing cotton plants enables the survival 

 of the immature weevils in the squares on the soil surface. 



252. , and Bonham, C. D. 1971. Temperature in the plant parts of long- 

 staple cotton. J. Econ. Entomol. 64: 636-537. 



Temperatures of squares, bolls and terminal buds of long-staple cotton and 

 the temperature within the squares, boll bracts, and cotton plant oanopy 

 were 2-5"? less than air temperature. The temperatures of plant bracts 

 are highly correlated with air temperatures and may be estimated from air 

 temperature with regression equations. 



253. ; Cole, C. L., and Bull, D. L. 1970. Populations of boll weevils in 

 selected fields in Presidio County, Texas, and Ojinaga, Chihuahua, 

 Mexico, in late 1968 subsequent to reproductive-diapruse control 

 programs in 1965-1967. J. Econ. Entomol. 63: 1084-1086. 



Surveys in August-October 1968 in areas in Presidio, Texas, and Ojinaga, 

 Chihuahua, Mexico, that were treated in 1965-1967 in a reproductive-diapause 

 control program against Anthonomus grandis Boheman indicated that the popu- 

 lations were increasing in several fields. The locations of these fields 

 in the Rio Grande and Rio Conchos valleys are such that the weevils may soon 

 repopulate the entire sprayed area if conditions are favorable. 



254. ; Cole, C. L.; Tingle, F. C; Stoner, A.; Martin, D. F.; and Curl, 

 L. F. 1968. A reproductive-diapause control program for the boll weevil 

 in the Presidio, Texas-Ojinaga, Chihuahua area, 1965-67. J. Econ. 

 Entomol. 61: 1660-1666. 



Control of the late-season reproductive generation and of dlapausing 

 Anthonomus grand is Boheman by aerial application of ultra-low-volume spray 

 beginning in early September reduced overwintering populations to a very 



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