Small-plot, low-dose treatments of triclopyr for selective control of Eurasian watermilfoil
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Published source details
Poovey A.G., Getsinger K.D., Skogerboe J.G., Koschnick T.J., Madsen J.D. & Stewart R.M. (2004) Small-plot, low-dose treatments of triclopyr for selective control of Eurasian watermilfoil. Lake and Reservoir Management, 20, 322-332.
Published source details Poovey A.G., Getsinger K.D., Skogerboe J.G., Koschnick T.J., Madsen J.D. & Stewart R.M. (2004) Small-plot, low-dose treatments of triclopyr for selective control of Eurasian watermilfoil. Lake and Reservoir Management, 20, 322-332.
Summary
Action: Use herbicide to control problematic plants
A replicated, paired, controlled, before-and-after study in 1998 in two lakes invaded by Eurasian watermilfoil Myriophyllum spicatum in Minnesota, USA (Poovey et al. 2004) found that treating plots with herbicide typically maintained, or minimized declines in, aquatic macrophyte richness and abundance. Comparing data from just before and eight weeks after herbicide application, total richness did not decline in seven of nine treated plots (for which before: 0.6–2.8; after: 0.8–3.6 species/survey point) but declined in two of three treated plots (for which before: 1.6–2.4; after: 0.5–1.4 species/survey point). The frequency of native macrophytes declined in both treated plots (before: present at 34–62% of survey points; after: 28–42%) and untreated plots (before: 35%; after: 11%) – but note that the decline was smaller in treated than untreated plots (not statistically tested). Eurasian watermilfoil cover declined in treated plots (before: 98–100%; after: 56–73%) but was stable in untreated plots (before: 99%; after: 100%). See original paper for data on the abundance of other individual species. Methods: A total of twelve 1-ha plots (three sets of four) were established in submerged macrophyte beds dominated by Eurasian watermilfoil. Triclopyr herbicide was applied to nine plots (three plots/set) in late June 1998. The dose was 0.5, 1.0 or 1.5 mg/L, depending on how sheltered or exposed the plot was. The final three plots (one plot/set) received no herbicide. Aquatic macrophytes were surveyed at 36 points/plot before intervention (20 June) and eight weeks after (3 August).
Output references
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