Entireleaf Morningglory Control in Cotton

T.N. Tripp and F.L. Baldwin


 
ABSTRACT

Field experiments were conducted in 1985 in order to evaluate preemergence and pre-plant incorporated herbicide treatments for entireleaf morningglory (Ipomoea hederacea var. integriuscula Gray) control in cotton (Gossypium hirsutum L.). The experimental design was randomized complete block and plots were located in grower fields at two sites, Lonoke and Rohwer. Treatments were rated for entireleaf morningglory control and cotton injury 16 to 23 days after application at Lonoke and 18 to 31 days after application at Rohwer. Morningglory control was greater at Lonoke for most of the treatments. This was probably due to the lack of rainfall for 10 days following application at Rohwer. At Lonoke, all preemergence combinations of fluometuron (1.12 kg/ha) plus norflurazon (0.56 kg/ha), diuron (0.9 kg/ha), alachlor (2.24 kg/ha), metolachlor (1.68 kg/ba), or pendimethalin (0.84 kg/ha) resulted in greater morningglory control than either norflurazon or fluometuron alone. When evaluated at the 7.5 cm growth stage of cotton, greater than 90% control was obtained with norflurazon + fluometuron PRE (0.56 +1.12 kg/ha), norflurazon PPI + fluometuron PRE (0.56 +1.12kg/ha), norflurazon PPI + norflurazon PRE + fluometuron PRE (0.56 + 0.56 + 1.12 kg/ha), and norflurazon PPI + norflurazon PRE + cyanazine PRE (0.56 + 0.56 + 0.7 kg/ha). At Rohwer, treatments that were incorporated tended to result in better morningglory control than the corresponding preemergence treatment. No treatment resulted in greater than 20% crop injury at the 7.5 cm stage of growth. Forty-five days after application, there were no visible signs of crop injury by any treatment.



Reprinted from 1986 Proceedings: Beltwide Cotton Production Research Conferences pp. 248 - 249
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998