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Spreading Dogbane (Apocynum androsaemifolium) Development in Wild Blueberry Fields

Published online by Cambridge University Press:  20 January 2017

Lin Wu
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, B2N 4V9, NS, Canada
Nathan S. Boyd
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, B2N 4V9, NS, Canada
G. Christopher Cutler
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, B2N 4V9, NS, Canada
A. Randall Olson
Affiliation:
Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, B2N 4V9, NS, Canada
Corresponding
E-mail address:

Abstract

Spreading dogbane is a common perennial weed in wild blueberry fields. It is highly competitive and spreads rapidly once established. Herbicides can provide effective control of spreading dogbane, but application timing is important. The emergence pattern, ramet height, and flowering time of spreading dogbane were observed in 2008 and 2009, and thermal-based emergence, growth, and development models were developed and used to estimate optimum herbicide application timing. Spreading dogbane emergence and height were described with a three-parameter, sigmoid, nonlinear regression model, whereas flowering was described with a four-parameter, Weibull, nonlinear regression model. Spreading dogbane ramets initiated emergence soon after the biofix date of April 1. Peak emergence tended to occur at 420 growing degree days (GDD). Spreading dogbane reached its peak height by about 558 GDD. The maximum number of flowers per plant was reached at approximately 750 GDD. This study suggested that POST herbicides should be applied between 486 and 535 GDD to maximize efficacy. This time frame occurs after peak emergence and during early floral bud development.

Type
Weed Biology and Ecology
Copyright
Copyright © Weed Science Society of America 

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