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Characterizing spatial stability of weed populations using interpolated maps

Published online by Cambridge University Press:  12 June 2017

Roland Gerhards ,
Dawn Y. Wyse-Pester ,
David Mortensen  and
Gregg A. Johnson
Dawn Y. Wyse-Pester
Affiliation:
Department of Agronomy, University of Nebraska, Lincoln, NE 68583-0915
David Mortensen
Affiliation:
Department of Agronomy, University of Nebraska, Lincoln, NE 68583-0915
Gregg A. Johnson
Affiliation:
University of Minnesota, Southern Experimental Station, Waseca, MN 56093-4521
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Abstract

Intensive surveys were conducted in 2 fields in eastern Nebraska to determine the spatial stability of common sunflower, velvetleaf, green and yellow foxtail, and hemp dogbane over 4 yr (1992 to 1995). The 1st field was planted to soybean in 1992 and corn in 1993, 1994, and 1995. The 2nd field was planted to corn in 1992 and 1994 and soybean in 1993 and 1995. Weed density was sampled prior to postemergence herbicide application at approximately 800 locations per year in each field on a regular 7 m grid. The same locations were sampled every year. Weed density at locations between the sample sites was determined by linear triangulation interpolation. Weed seedling distribution was significantly aggregated, with large weed-free areas in both fields. Common sunflower, velvetleaf, and hemp dogbane patches were very persistent in diameter in the east-west and north-south directions and in location and area over 4 yr in the 1st field. Foxtail distribution and density continuously increased in each of the 4 yr in the first field and decreased in the 2nd field. A geographic information system was used to overlay maps from each year for a species. This showed that 36% of the sampled area was continuously free of common sunflower, 62.5% was free of hemp dogbane, and 11.5% was free of velvetleaf in the 1st field, but only 1% was free of velvetleaf in the 2nd field. The persistence of broadleaf weed patches suggests that weed seedling distributions mapped in one year are good predictors of future seedling distributions. Improved and more efficient sampling methods are needed.

Keywords

Linear interpolationsite-specific weed controlintegrated weed managementABUTHAPCCAHELANSETLUSETVIVelvetleaf, Abutilon theophrasti Medikus. ABUTHHemp dogbane, Apocynum cannabinum L. APCCACommon sunflower, Helianthus annuus L. HELANYellow foxtail, Setaria glauca (L.) Beauv. SETLUGreen foxtail, Setaria viridis (L.) Beauv. SETVISoybean, Glycine max (L.) Merr. Corn, Zea mays L.
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 1 , February 1997 , pp. 108 - 119
Copyright
Copyright © 1997 by the Weed Science Society of America 

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