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Competition between wheat and canarygrass biotypes and their response to herbicides

Published online by Cambridge University Press:  12 June 2017

Catherine G. Afentouli  and
Ilias G. Eleftherohorinos
Catherine G. Afentouli
Affiliation:
Laboratory of Agronomy, University of Thessaloniki, 54006 Thessaloniki, Greece
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Abstract

Field experiments were conducted in Thessaloniki, Greece, from 1991 to 1994 to study the competition of littleseed canarygrass and short-spiked canarygrass biotypes in wheat and to evaluate their response to diclofop, fenoxaprop, tralkoxydim, and CGA-184927. Competitive ability of all canarygrass biotypes was similar, though species differed in panicle numbers. All littleseed canarygrass biotypes showed faster growth rate than the short-spiked canarygrass biotypes. Wheat grain yield decreased as canarygrass density increased. For example, 152 and 304 canarygrass plants m–2 reduced wheat yield 32 and 42%, respectively. None of the canarygrass biotypes at any density had any effect on grain yield of wheat when cold and dry weather prevailed during the early stages of growth. CGA-184927 and tralkoxydim were more effective herbicides against all short-spiked canarygrass biotypes than fenoxaprop and diclofop. CGA-184927 and fenoxaprop provided > 98% control of all littleseed canarygrass biotypes; control with tralkoxydim was < 80%; and diclofop gave 82 to 96% control of this weed species. Herbicide control of canarygrass increased wheat yield relative to the weedy control, and only diclofop was phytotoxic to wheat.

Keywords

DiclofopfenoxaproptralkoxydimCGA-184927, 2-propynyl-(R)-2-[4-(5-chloro-3-fluoro-2-pyridyloxy)-phenoxy]-propionatelittleseed canarygrass, Phalaris minor Retz. PHAMIshort-spiked canarygrass, Phalaris brachystachys Link. PHABRwheat, Triticum aestivum L. ‘Yekora.’Competitioncanarygrass biotypesherbicide responsePHAMIPHABR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 1 , February 1999 , pp. 55 - 61
Copyright
Copyright © 1999 by the Weed Science Society of America 

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