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Title: COMPARISON OF THE ADJUVANTS, ETHEPHON 6, DROPP SC, FINISH, AND MFX-0307 APPLIED WITH DEF 6 COTTON DEFOLIANT

Author
item JONES, ELIZABETH - DELTA RESEARCH & EXT CTR
item WILLS, GENE - DELTA RESEARCH & EXT CTR
item Hanks, James
item ALFORD, BOBBY - HELENA CHEMICAL CO
item MACK, ROBERT - HELENA CHEMICAL CO

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/10/2005
Publication Date: 6/15/2005
Citation: Jones, E.J., Wills, G.D., Hanks, J.E., Alford, B.W., Mack, R.E. 2005. Comparisonof the adjuvants, ethephon 6(r, dropp sc (r), finish(r), and mfx-0307(r)applied with def 6(r) cotton defoliant. National Cotton Council Beltwide Cotton Conference. CD-ROM, pg. 1928-1930.

Interpretive Summary: A field study was conducted at Stoneville, MS during 2004 to compare the effects of selected combinations of harvest-aid chemicals on cotton. Combinations of Def 6 and selected adjuvants were applied to cotton var. ‘Delta Pine BR 451’ at 60 to 65% open bolls. Treatments included combinations of Def 6 and Ethephon 6; Def 6, Ethephon 6 and Dropp SC; Def 6 and Finish 6; and Def 6 and MFX 0307. Visual ratings were determined on the percent defoliation and boll opening at 9 and 14 days after treatment (DAT) and shoot regrowth at 21 DAT. The combinations of Def 6, Ethephon 6 and Dropp SC; Def 6 and Finish 6; and Def 6 and MFX 0307 each resulted in greater percent defoliation, percent open bolls and less percent shoot regrowth than the standard application mixture of Def 6 and Ethephon 6. The standard treatment resulted in 75 to 81% defoliation and 75 to 83% open bolls, respectively at 9 and 14 DAT. Percent defoliation and open bolls were increased to 96 and 97% respectively at 9 and 14 DAT with other treatment combinations. Shoot regrowth for the standard treatment was 54% at 21 DAT and was reduced to 19% with the combination of Def 6, Ethephon 6, and Dropp SC.

Technical Abstract: A field study was conducted during 2004 to compare the effects of selected adjuvants combined with Def 6 cotton defoliant on the percent defoliation and boll opening at 9 and 14 days after treatment (DAT) and shoot regrowth at 21 DAT. The combinations of Def 6, Ethephon 6 and Dropp SC; Def 6 and Finish 6; and Def 6 and MFX 0307 each resulted in greater percent defoliation, percent open bolls and less percent shoot regrowth than the standard application mixture of Def 6 and Ethephon 6. The standard treatment resulted in 75 to 81% defoliation and 75 to 83% open bolls, respectively at 9 and 14 DAT. Percent defoliation and open bolls were increased to 96 and 97% respectively at 9 and 14 DAT with other treatment combinations. Shoot regrowth for the standard treatment was 54% at 21 DAT and was reduced to 19% with the combination of Def 6, Ethephon 6, and Dropp SC.