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Published in Crop Sci 13:191-194 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Response of Perennial Sowthistle Selections to Herbicides1

A. R. Bell, John D. Nalewaja and A. B. Schooler2

Perennial sowthistle (Sonchus arvensis L.) seed was collected from three fields in North Dakota and Minnesota. Plants grown from the seed in the greenhouse were treated with 2,4-dichlorophenoxy acetic acid (2,4-D), and 3,6-dichloro-o-anisic acid (dicamba), or 4-amino-3,5,6-trichloropicolinic acid (picloram). The range in response to the herbicides of perennial sowthistle from each field was similar with 0 to 8% of the plants tolerant and 68 to 92% susceptible. The range of response to herbicides was similar for greenhouse plants grown from clones collected throughout North Dakota, South Dakota, and Minnesota and for plants grown from seed collected in selected crop fields. The response of selected perennial sowthistle clones to herbicides in the field did not resemble the response obtained in the greenhouse. The number of live shoots per field plot after treatment with 1.68 kg/ha dicamba or 2,4-D varied among selections from 0 to 8 and 3 to 12, respectively. Generally, the selections with the most live shoots per plot after herbicide treatment had a greater capacity for regrowth from creeping roots than did the selections with the least live shoots.

Key Words: 2,4-D • Dicamba • Picloram • Herbicide tolerance

1 Published with the approval of The N. D. State Agr. Exp. as J. Article No. 381.

2 Instr., Prof., and Assoc. Prof., respectively, Dept, of Agron., N. D. State Univ., Fargo, N. D. 58102.

Received for publication September 5, 1972.




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