-1 



A04 



792. . 1980. Effectiveness of diflubenzuron on boll weevils in the Texas 

 Rolling Plains. Southwest. Entomol. Suppl. 1: 8-14. 



Under conditions of heavy boll weevil infestation 8 applications of diflubenzuron 

 at rates of 35, 70 and 140 g Al/ha resulted in a seasonal average adult Loll 

 weevil, Anthonomus grand is Boheman. emergence of 44.4, 40.0, and 27.0%, respec- 

 tively. Adult boll weevil emergence from untreated cotton plots averaged 73.5%. 

 Lint yield data indicated the 70 and 140 g Al/ha rates to be equal in effective- 

 ness to 8 applications of azinphosmethyl at a rate of 336 g Al/ha. Four appli- 

 cations of diflubenzuron at rates of 52.5, 70, and 140 g Al/ha directed against 

 a light overwintered boll weevil population resulted in adult emergence of 24.5, 

 13.4 and 9.7%, respectively. All rates of diflubenzuron were less detrimental 

 to selected beneficial arthropods than azinphosmethyl. 



793. , and Adkisson, P. L. 1970. Distribution of boll weevil- infested cotton 

 fields in relation to overwintering habitats in the Higi. and Rolling 

 Plains of Texas. J. Econ. Entomol. 63: 1906-1909. 



In 1966, cotton fields infested with Anthonomus grandis Boheman in an 8- 

 county area of the High and Rolling Plains of Texas were distributed in a 

 nonrandom, "clumped" pattern following an areawlde reproductive-diapause 

 control program in 1965. During a period of low weevil density, the dis- 

 tribution of cotton fields infested with weevils appeared to be influenced 

 primarily by the abundance of favorable weevil overwintering habitats with- 

 in the cotton growing area, and by the distance of the habitats from the 

 cotton fi'.lds. Most of the infested fields were immediately adjacent to a 

 favorable boll weevil overwintering habitat. Infestations were detected in 

 very few fields situated more than 1/2 mile from overwintering habitats, 

 with more than 50% of the infested fields situated \d.thin 1/2 mile of heavy 

 shinnery oak or mesquite stands. 





