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Spatial Pattern of Weeds Based on Multispecies Infestation Maps Created by Imagery

Published online by Cambridge University Press:  20 January 2017

Louis Longchamps ,
Bernard Panneton ,
Robin Reich ,
Marie-Josée Simard  and
Gilles D. Leroux
Louis Longchamps*
Affiliation:
Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523
Bernard Panneton
Affiliation:
Agriculture and Agri-Food Canada, St-Jean-sur-Richelieu, Quebec, Canada
Robin Reich
Affiliation:
Forest and Rangeland Stewardship Department, Colorado State University, Fort Collins, CO 80523
Marie-Josée Simard
Affiliation:
Agriculture and Agri-Food Canada, St-Jean-sur-Richelieu, Quebec, Canada
Gilles D. Leroux
Affiliation:
Département de Phytologie, Université Laval, Québec, Canada
*
Corresponding author's E-mail: louis.longchamps@colostate.edu
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Abstract

Weeds are often spatially aggregated in maize fields, and the level of aggregation varies across and within fields. Several annual weed species are present in maize fields before postemergence herbicide application, and herbicides applied will control several species at a time. The goal of this study was to assess the spatial distribution of multispecies weed infestation in maize fields. Ground-based imagery was used to map weed infestations in rain-fed maize fields. Image segmentation was used to extract weed cover information from geocoded images, and an expert-based threshold of 0.102% weed cover was used to generate maps of weed presence/absence. From 19 site-years, 13 (68%) demonstrated a random spatial distribution, whereas six site-years demonstrated an aggregated spatial pattern of either monocotyledons, dicotyledons, or both groups. The results of this study indicated that monocotyledonous and dicotyledonous weed groups were not spatially segregated, but discriminating these weed groups slightly increased the chances of detecting an aggregated pattern. It was concluded that weeds were not always spatially aggregated in maize fields. These findings emphasize the need for techniques allowing the assessment of weed aggregation prior to conducting site-specific weed management.

Keywords

Bird vetch, Vicia cracca L. VICCRbroadleaf plantain, Plantago major L. PLAMAcommon lambsquarters, Chenopodium album L. CHEALcommon ragweed, Ambrosia artemisiifolia L. AMBELdandelion, Taraxacum officinale G. H. Weber ex Wiggers TAROFladysthumb, Polygonum persicaria L. POLPEoakleaf goosefoot, Chenopodium glacum L. CHEGLoxeye daisy, Chrysanthemum leucanthemun L. CHYLEredroot pigweed, Amaranthus retroflexus L. AMARErhombic copperleaf, Acalypha rhomboidea Raf. ACCRHshepherd's purse, Capsella bursa-pastoris (L.) Medik. CAPBPwhite clover, Trifolium repens L. TRFREDicotyledonsmonocotyledonssite-specific weed managementspatial patternspatial segregation
Type
Weed Biology and Ecology
Information
Weed Science , Volume 64 , Issue 3 , September 2016 , pp. 474 - 485
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Anita Dille, Kansas State University.

References

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