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Control of Reed Canarygrass Seedlings in Culm Propagules of Reed Canarygrass¹

Vegetative increase of homozygous reed canarygrass (Phalaris arundlnacea L.) from individual clones by means of culm node propagules is feasible and desirable, but ripe seed heads accompanying chopped culms often lead to seedling contamination of the stands.

We conducted one trial to establish the extent of contamination from seedlings when culm propagation is used and three trials to determine whether some herbicides can eliminate reed canarygrass seedlings without damage to culm propagule growth.

We confirmed that seedlings contaminate when clones are propagated from culms.

Seven herbicides were evaluated for reed eanarygrass seedling control and for culm propagule tolerance. Chloramben (3-amino-2,5-dichlorobenzoic acid), EPTC (S-ethyl dipropylthiocarbamate), dinoseb (2-sec-butyl-4,6-dinitrophenol), trifluralin (,,-trifluoro-2,6-dinitro-N,N-dipropyl--toluidine), and paraquat (l,l’-dimethyl-4,4’-bipyridinium ion) did not prove satisfactory in meeting the objective. These herbicides either did not eliminate sufficient numbers of seedlngs, or they killed the culm propagules. Propachlor ((2-chloro-N-isopropyl-acetanilide) applied at 3.36 or 4.48 kg/ha provided considerable seedling control without killing culm propagules. Alachlor [2-chloro-2’,6’-diethyl-N-(methoxymethyl)acetanilide], applied at 3.36 kg/ha, was the most effective herbicide for reducing seedling contamination without significantly affecting culm propagule growth.

Key Words: Phalaris arundinacea L. • Grass seedling control • Vegetative propagation • Node propagation • Alachlor • Chloramben • EPTC • Trifluralin • Paraquat • Dinoseb

² Graduate Assistant; Research Agronomist, NCR, ARS, USDA, and Professor; and Professor, Agronomy and Plant Genetics Department, University of Minnesota, St. Paul, MN 55101.

Received for publication June 5, 1974.