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Fall best time to eliminate perennial weedsNebraska Fall is the best time to treat perennial weeds in crops and pasture, said a University of Nebraska-Lincoln specialist. Herbicides sprayed in fall weaken the weeds and then the winter kills them, said Bob Klein, cropping systems specialist at UNL's West Central Research and Extension Center in North Platte. Spring spraying weakens weeds, but then they have idea conditions to recover. Klein advised producers to spray when the weeds are actively growing. As they prepare for winter, they're taking nutrients down to the roots to store them for winter, he said, and the herbicide also moves down into the roots, which adds to its effectiveness. Sometimes weeds become dormant as a result of drought, Klein said, but a lot of times we have good fall rains. Wait a week after a rain and spray when the weeds are growing again. A number of new herbicides, such as Milestone, have become available in recent years. Klein advised producers to investigate these new chemicals because some of them have really provided good results. These new products incorporate new chemistry and different modes of action. Different crops and different weed infestations will require different treatments, Klein said. To get the latest recommendations, Klein recommended getting a copy of UNL's Weed Management Guide, EC130. It's available at county extension offices, but also on the Web. It's a large document, about 200 pages, so producers will probably want to print only the pages they need, he said. Not only are the product labels legal documents, they are also a source of important information about weeds they product will kill, what crops it can be used on and how long the residual action will last. Growers should be very careful in choosing an herbicide, taking into account what crop might come after the one they're treating. With guidance from product labels and UNL's Weed Management Guide, producers can make good decisions about herbicides, both old and new, for eliminating problem perennial weeds. 9/22/08 Date: 9/17/08 Advertisement
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