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Spatial Pattern of Weeds Based on Multispecies Infestation MapsCreated 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

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Weeds are often spatially aggregated in maize fields, and the level ofaggregation varies across and within fields. Several annual weed species arepresent in maize fields before postemergence herbicide application, andherbicides applied will control several species at a time. The goal of thisstudy was to assess the spatial distribution of multispecies weedinfestation in maize fields. Ground-based imagery was used to map weedinfestations in rain-fed maize fields. Image segmentation was used toextract weed cover information from geocoded images, and an expert-basedthreshold of 0.102% weed cover was used to generate maps of weedpresence/absence. From 19 site-years, 13 (68%) demonstrated a random spatialdistribution, whereas six site-years demonstrated an aggregated spatialpattern of either monocotyledons, dicotyledons, or both groups. The resultsof this study indicated that monocotyledonous and dicotyledonous weed groupswere not spatially segregated, but discriminating these weed groups slightlyincreased the chances of detecting an aggregated pattern. It was concludedthat weeds were not always spatially aggregated in maize fields. Thesefindings emphasize the need for techniques allowing the assessment of weedaggregation 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 WiggersTAROFladysthumb, 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

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 64 , Issue 3 , September 2016, pp. 474 - 485
Copyright
Copyright © Weed Science Society of America 

Footnotes

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

References

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