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AdvertisementFall weed controlWeed control activities can continue well into the fall and it is the opportune time to get the best results on some of our most difficult weeds. A lot of our tough weeds thrive when the temperatures are in the 40s and 50s in mid-to-late fall. This year, they are doing particularly well because of available moisture. Many of the perennials and winter annuals get their start during early fall when there is abundant moisture, and the best time to kill them is when they are growing vigorously. Here are some weed control operations that can be done during the next four to six weeks, weather permitting: --Make herbicide applications for pennycress and downy brome control in established alfalfa. Karmex, Sencore/Lexone, and Sinbar should be applied to dormant alfalfa. --Treat musk thistle with Tordon; 2,4-D + Banvel; or Milestone. Use Tordon 22K at 6 to 8 ounces for November applications. Milestone or one of the combination products containing Milestone does especially well on all the thistles, including musk thistle and Canada thistle. --Apply herbicides to vigorous fall growth of Canada thistle and field bindweed. Use 2,4-D, Banvel or Roundup or combinations of any two of the products. Research shows that Milestone applied in the fall is nearly 100 percent effective in control of Canada thistle. In garden spots, limit use to Roundup and 2,4-D because Banvel can cause residual carry-over problems. --Apply turf herbicides for dandelion, chickweed, ground ivy, henbit, shepherdspurse, black medic, and other perennials and winter annuals in lawns. A combination product, such as Trimec, that contains 2,4-D, mecoprop and dicamba (Banvel) will control most troublesome broadleaf weeds. --Clean up and winterize sprayers for storage. --Store liquid pesticides that might be damaged by freezing, in a heated building. The pesticide label provides guidelines for protection against low temperatures when applicable. Dry forms of herbicides in labeled paper bags should be protected from moisture by placing in plastic bags. Advertisement
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