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Posted Wed Mar 25 2009: from American Society of Horticultural Science, via EurekAlert:
Effects of 'herbicide drift' on white oak
Herbicide drift, which occurs when [herbicides] "drift" from the targeted application area to a nearby non-targeted area, is a particular concern in Midwestern regions of the United States.... White oak, a popular landscape and forest species native to the eastern United States, has been suffering from an abnormality called "leaf tatters", which give the leaves a lacy appearance. Leaf tatters in white oak trees have been reported in states from Minnesota, south to Missouri, and east to Pennsylvania.... The researchers found that visual injury to white oak seedlings was dependent on year, herbicide treatment, concentration, growth stage, and rating date.... This research is the first to document leaf tatters injury from exposure of oaks to chloroacetanilide herbicides.
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