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Response of Flax to Postemergence Herbicides¹

A flax (Linum usitatissimum L.) variety, ‘Newbud,’ known to be susceptible to 2-methyl-4-chlorophenoxyacetic acid (MCPA) and a variety, ‘Bolley,’ known to be resistant to MCPA were treated for response to 2-methoxyo 3,6-dichlorobenzoic acid (dicamba), 4-amino-3,5,6-trichloropicolinic acid (picloram), 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil), and 2,2-dichloropropionic acid (dalapon) under field conditions at Fargo, N. D. Although all herbicides reduced the flaxseed yield of Newbud more than that of Bolley, the greatest difference between the varieties occurred with MCPA. Injury to both varieties was influenced by the herbicide and application rate. The herbicides delayed flowering and maturity dates, generally reduced seed weight and germination, and reduced or did not affect oil percentage and iodine value.

Key Words: MCPA • Picloram • Dicamba • Bromoxynil • Dalapon

² Associate Professors, Department of Agronomy, North Dakota State University, Fargo 58102.

Received for publication June 10, 1968.

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