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Control of Quackgrass (Agropyron repens) in Highbush Blueberries (Vaccinium corymbosum) and Hybrid Rhododendron (Rhododendron X)

Published online by Cambridge University Press:  12 June 2017

G. F. Ryan  and
C. C. Doughty
G. F. Ryan
Affiliation:
Western Washington Res. and Ext. Center, Puyallup, WA 98371
C. C. Doughty
Affiliation:
Western Washington Res. and Ext. Center, Puyallup, WA 98371
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Abstract

Quackgrass [Agropyron repens (L.) Beauv.] was controlled by spring application of pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide] in 1970 and 1971, but when spring rainfall was below nornal in 1973, only pronamide applied the previous fall gave control. Terbacil (3-tert-butyl-5-chloro-6-methyluracil) gave 90% control of quackgrass for 2 yr at 2.2 kg/ha. Some control continued for 3 yr at 4.5 kg/ha. Three applications of glyphosate [N-(phosphonomethyl)glycine] at 3 kg/ha applied during a 2-yr period controlled quackgrass 97 to 100%. Phytotoxicity was not observed on 14-yr-old highbush blueberries (Vaccinium corymbosum L.) from pronamide or terbacil, on 4-yr-old blueberries from pronamide, or on 2-yr-old rhododendrons (Rhododendron × ‘A. Bedford’) from dichlobenil (2,6-dichlorobenzonitrile), pronamide, or directed sprays of glyphosate or amitrole (3-amino-s-triazole).

Keywords

Treatment timephytotoxicityherbicides
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 516 - 520
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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