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Control of Yellow Toadflax by Grass Competition Plus 2,4-D

  • A. C. Carder (a1)

Abstract

Smooth bromegrass, Bromus inermis, and red fescue, Festuca rubra, were sown in 1952 on a fertile soil severely infested with yellow toadflax, Linaria vulgaris Mill., in the Peace River section of Alberta. Annual applications of 2,4-dichlorophenoxyacetic acid (2,4-D) were made at late flower-bud stage at nil, 1, 2, 3, and 4 lb/A acid equiv. In 1958, the average per cent of toadflax in the brome was 1, 0.5, 0.5, 0, and 0, respectively. Red fescue had 6 to 0.1% of toadflax. All rates of 2,4-D prevented seed production. The sods were broken in 1959, and toadflax re-established strongly on all plots from dormant seed and residual plants. In 1961, the brome, rejuvenated by breaking, strongly suppressed toadflax, while fescue failed to compete with it.

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References

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1. Carder, A. C. 1956. Incidence of toadflax in the Peace River region. Res. Rept. Natl. Weed Com. (West. Section) 3:129.
2. Frankton, C. and Wright, W. H. 1955. Weeds of Canada. Canada Dept. of Agric. Pub. 948
3. Kinzel, W. 1926. Neue Tabellen zu Frost und Licht als beeinflussende Kräfte bei der Sammenkeimung. Eugen Ulmer, Verlagsbuchhandlung, Stuttgart.
4. Muenscher, W. C. 1949. Weeds. The MacMillan Co., New York, New York.
5. Zilke, S. and Coupland, R. T. 1954. Seed production of toadflax (Linaria vulgaris Mill.) in Saskatchewan in 1952. Res. Rept. Natl. Weed Com. (West. Section) 1:104105.
6. Zilke, S. and Coupland, R. T. 1954. The role of seed in the spread of toadflax (Linaria vulgaris Mill.) Res. Rept. Natl. Weed Com. (West. Section) 1:105.
7. Zilke, S. and Coupland, R. T. 1954. The reproductive capacity of toadflax (Linaria vulgaris Mill.) Res. Rept. Natl. Weed Com. (West. Section) 1:105.

Control of Yellow Toadflax by Grass Competition Plus 2,4-D

  • A. C. Carder (a1)

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