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Economic and interference threshold densities of quackgrass (Elytrigia repens) in potato (Solanum tuberosum)

Published online by Cambridge University Press:  12 June 2017

Régis Baziramakenga  and
Gilles D. Leroux
Régis Baziramakenga
Affiliation:
Soils and Crops Development and Research Centre, 2560 Hochelaga Boulevard, Sainte-Foy, Quebec, Canada G1V 2J3
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Abstract

Field studies were conducted in 1989 and 1990 at St-Augustin, Quebec, Canada, to determine the economic threshold density of quackgrass in potato. Potato yield losses due to quackgrass interference increased with quackgrass population density. Potato yield ranged from 33 to 73% in 1989, and from 19 to 44% in 1990. The relationship between potato yield losses and quackgrass densities was described by a rectangular hyperbolic function. Dry weight of quackgrass proved to be the best predictor of potato yield loss compared to shoot number. The interference thresholds for 10% potato yield loss amounted to 25 shoots m−2 or 20 g total dry biomass m−2. The economic threshold varied between 0.04 and 2 shoots m−2 or 0.0165 and 1.5 g total dry biomass m−2, depending on the variables considered.

Keywords

Quackgrass, Elytrigia repens (L.) Nevski AGRREpotato, Solanum tuberosum L.Interference thresholdcrop yield losseconomic thresholdweed densityAGRRE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 2 , April 1998 , pp. 176 - 180
Copyright
Copyright © 1998 by the Weed Science Society of America 

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