/ 



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*^ i u wT .M > Pjnii' P '.»j ii Lv i j- i ^|.4ii i m I w i mm^ifmff^^ . ^ " w i "ff»yj.p <«^ niy <7«JH>' F M" ' 



496 



of all cotton acreage with all stalks and roots destroyed is good and 90% or 

 less is judged to be poor. More weevils were usually collected in March, the 

 time of plant emergence, than at any other time of year except for the August- 

 September period. In early August 1973 and 1974, the period of defoliation, 

 69 and 79% of the females and 20 and 53% of the males, respectively, that were 

 collected, were in intermediate to firm diapause. 



981. ; Graham, H. M.; Parker, R. D.; and Davis, J. W. 1976. Seasonal 

 patterns of boll weevil response to traps baited with grandlure in the 

 Lower Rio Gsande Valley of Texas. ^ Detection and Management of the 

 iJoll Weevil With Phecomone. Tex. Agric. Exp. Stn. Res. Monogr. 8, 



pp. 20-25. 

 More boll weevils were caught from mid-August to mid-September following de- 

 foliation, harvest, and plow-up than at any other time of the year at Browns- 

 ville and Weslaco in the lower Rio Grande Valley of Texas during 1972-74. In 

 both Brownsville and Weslaco, poor plow-up in August and early in September 

 1973 resulted in larger populations collected in traps than did good plow-ups 

 in August 1974. Weevil collections made in March, at the time of plant emer- 

 gence, were generally greater than at any other time except for the August- 

 September period. In late-July or early-August of both years, 54 to 79 percent 

 of the females and 8 to 53 percent of the males were in Intermediate to firm 

 diapause, which coincided with defoliation. 



982. ; Guerra, A. A.; and Garcia, R. D. 1977. Diflubenzuron[sic] : effect 



on the tobacco budworm and the boll weevil. J. Econ. Entomol. 70: 126-128. 

 The LCcf. of dlflubenzuron, (N-[ [4-chlorophenyl) amlno]carbonyl]-2,6-dif luoro- 



benzamide), for neonate larvae of the tobacco budwonn, Heliothis virescen s (F.), 

 was 1.3 X 10- % wt/vol when it was incorporated into the diet. Tlie LCrf. for 

 pupae was 1.3 X 10-^% wt/vol in the larval diet. With diets containing 1 X 10-^%, 



