Spatial and temporal stability of weed populations over five years

By Nathalie Colbach, F. Forcella, G. Johnson. Weed science, 2000

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Evaluating field-scale sampling methods for the estimation of mean plant densities of weeds (2000, methodology): “…the predicted-map methods are really not satisfactory, especially considering the amount of work needed to prepare the sampling protocol, i.e. information on spatial distribution of the previous year and on interannual cross-semivariograms needed to predict the seedling maps (Colbach et al., 2000).”
In-Field Movement of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Its Impact on Cotton Lint Yield: Evidence Supporting a Zero-Threshold Strategy (2014, background): “The patchy distribution of weeds is generally most stable for perennial species and for those with high levels of shattering prior to crop harvest (Colbach et al. 2000).”
Reducing the Risks of Herbicide Resistance: Best Management Practices and Recommendations (2012, background): “The degree of spatial stability is more pronounced in perennial species and in large-seeded weeds, such as wild common sunflower and velvetleaf, which exhibit shattering and localized seed dispersal before crop harvest (Burton et al. 2005; Colbach et al. 2000; Dieleman and Mortensen 1999).”