138 



midsumirer. Rearing at fluctuating temperatures did not increase the time 

 required for development over that required at the constant temperatures if 

 the heal input was similar and temperatures did not exceed 30''C. 



259. Ganyard, M. C, Jr.; Bradley, J, R., Jr.; Boyd, F. J.; and Brazzel, 

 J. R. 1977. Field evalua; ion of dif lubenzuron (Dimilin) for control 

 of boll weevil reprbducf'on. J. Econ. Entomol. 70: 347-350. 



Diflubenzuron [Dimilirt®; l-(4 chlorophenyl)-3~(2, 6-difluorobenzoyl) -urea] was 

 tested for control of Anthonomus grandis Boheraan in a replicated field experi- 

 ment. Test plots were located in an area isolated from commercial cotton by 

 19-40 km. A population density of ca. 250 overwintered boll weevils/acre 

 (618/ha) was introduced into each of 15 plots. Three rates tested were 2-, 

 4-, and 8-oz Al/acre (141, 282, and 564 g/ha). Boll weevil damaged squares 

 were collected from cotton plants weekly, incubated for 7-9 days, and examined 

 for developing boll weevil larvae or pupae. Results showed that reproduction 

 in the diflubenzuron treated plots was reduced by >99% over the check plots 

 through the F^ generation. 



260. ; Bradley, J. R., Jr.; and Brazzel, J. R. 1978. Wide-area field test 

 of diflubenzuron for control of an indigenous boll weevil population. 

 J. Econ. Entomol. 71: 785-788. 



Diflubenzuron (Dimilin®; l-(4 chlorophenyl)-3(2, 6-difluorobenzoyl) -urea), 

 was applied 9-10 times at 0.14 kg Al/ha to all 76 cotton fields in an isolated 

 cotton production area for control of an indigenous low to moderate population 

 of Anthonomus grandis grandis Boheman. Boll weevil population dynamics were 

 recorded in the diflubenzuron treated fields and in a conventionally treated 

 check area. Results indicated >90% control of reproduction. The F-i boll 



