A78 



to emerge the follbwir.js year near or after cotton begins fruiting and will 

 have maximuir impact on the developing crop. .- ... 



943. Walker, J. K. , Jr. 1966. Overwintered boll weevil infestations in trap 

 crop plantings, 2960-66. Tex. Agrlc. Exp. Stn. Prog. Rep. PR-2433, 4 pp. 



Examination of the dAtA shows that. In the 7-year period, there was a great 

 deal of emergence in June, often quite late in June. In 4 of the 7 years 

 Important numbers ea^r^ed after the first one-third grown squares appeared. 

 If a pre-square appllcAtion of insecticide had been made, a large number of 



insects consequently vould have been unaffected. Also, it is obvious that one 



'( 

 could not aslect a calendar date and predetermine an "automatic" control pro- 

 gram for an insecticI'Je application; the date of maximum populations varied 

 from June 8 to June 2H, These findings are at considerable variance with the 

 50 years of hibernation cage emergence data. 



944. . 1966. The relationship of the fruiting of the cotton plant and 

 overwintered boil weevils to the F generation. J. Econ. Entomol. 59: 

 323-326. 



Studies at College St.">lion, Texas, in 1960-64 on the populations dynamics of the 

 boll weevil in an Ifioi^ted plot showed that generation rates of increase varied 

 from 2- to 40-fold. Differences seemed attributable to the magnitude of the 

 overwintered generatlom. The larger populations of overwintered weevils limited 

 square production, tft^reby limiting oviposition sites. Consequently, propor- 

 tionately fewer Fi rtsn'tited than from small overwintered populations. Peak F, 

 emergence was assocl;}t«'d with the peak blooming period of the cotton in the plot. 



945. . 1967. Studies in the fall and winter of oviposition prior to diapause 

 in the boll weftvll with observations on reversion from diapause to repro~ 

 duction. J. Econ, Entomol. 60: 798-802. 



Studies of isolated f^^aale boll weevils, Anthonomus grandls Boheman. in the fall 



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