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A94 



977. , and Davis, J. W. 1976. Termination of cotton plants with chemicils 

 and the effect on populations of boll weevils and tobacco budworms. 

 Proc. 1976 Beltwide Cotton Frod. Res. Conf., pp. 46-48. 



Single applications of sprays of commercial formulations of the plant growth 

 regulator chlorflurenol (a mixture of 65-70% methyl 2-chloro-9-hydroxyfluorent- 

 9-carboxylate, 18-25% of its nonchiorinated analog, and 10-12:: of its 2,7- 

 dichloroanalog) . 2,4-D (dimethyl amine salt of [2,4-dichlorophenoxyl acetic 

 acide), or a combination of the two containing 5 lb/acre chlorflurenol and 

 0.025 lb/acre 2,4-D were made to cotton at different intervals after the first 

 flower to teriminate square initiation and development. Plants were examined 

 to determine the effect on feeding and oviposition by the boll weevil, Anthonomus 

 grandis Boheman, and on yields. Neither compound has a direct effect on the 

 development of boll weevil larvae. An application of the combination made 35 

 days after the appearance of the first flower increased the percentage of open 

 bolls compared with the untreated check, reduced damaged squares 90% while 

 allowing only a 10% increase in bolls damaged by boll weevil feeding, and 

 increased yields. 



978. ; Dilday, R. H.; and Davis, J. W. 1979. Fruiting requirements of 

 short-season cottons to avoid damage by the boll weevil in the Lower 

 Rio Grande Valley. Proc. 1979 Beltwide Cotton Prod. Res. Conf., 



pp. 88-90. 

 Square populations and percentage open bolls of 'Stoneville 213' and *Tamcot 

 SP-37' and of 2 single-plant selections of SP-37 (GH-19-8-75 and GH-11-9-75) 

 that demonstrate side-by-side flowring were compared. Both the single-plant 

 selections had 21 to 60% open bolls when 50% of the hypothetical third gene- 

 ration of boll weevils had emerged. Also, these lines had 60 to 90% open 

 bolls 3-7 days earlier than did SP- . and their yields were equal to those 

 of SP-37 and ST-213. 



