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A mathematical analysis of factors affecting the rate of spread of patches of annual weeds in an arable field

Published online by Cambridge University Press:  20 January 2017

Jodie L. Woolcock  and
Roger Cousens
Jodie L. Woolcock
Affiliation:
Department of Agricultural Sciences, La Trobe University, Bundoora, Victoria 3083, Australia
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Abstract

A model is presented of the spread of a weed from a point source, with dispersal being both unaided and aided by a combine harvester. Four “type” weeds were modeled, chosen to represent species of differing population and dispersal ecologies and based broadly on Avena spp. (wild oats), Raphanus raphanistrum (wild radish), Bromus spp. (bromegrass), and Fumaria spp. (fumitory). Wind-adapted species were excluded. The greatest rate of spread was predicted to be for R. raphanistrum and the least for Fumaria, regardless of whether dispersal by combine harvester was included. Rate of spread was more sensitive to dispersal parameters than to demographic parameters and increased up to 16-fold as soon as any seeds were dispersed by the harvester. Given that uptake by the harvester is a function of phenology of seed production and dispersal, better data on such processes is required for weeds. Because rate of spread is more dependent on dispersal than on demographic factors, greater attention needs to be given to describing dispersal frequency distributions and especially to analysis of their shapes.

Keywords

Bromus spp., bromegrassRaphanus raphanistrum L. RAPRA, wild radishAvena spp., wild oats; Fumaria spp., fumitorySeed dispersalmanagementmodelpopulation growthpatchesspatial dynamicsRAPRA
Type
Research Article
Information
Weed Science , Volume 48 , Issue 1 , February 2000 , pp. 27 - 34
Copyright
Copyright © Weed Science Society of America 

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