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Fall Perennial Weed Spraying
Fall spraying can provide the best perennial weed control of any season. But it doesn't happen every time. Many factors influence final results.
1. Good active fall growth is needed. New shoots should be from underground parts; leaves on old cut-off stems are less effectively treated. It's best to have 6-8 inches of growth; results are best if there is a high percentage of the potential shoots emerged.
2. Growth should not be drought stressed or freeze damaged (discolored). Wait at least 24 hours after temperatures are below 26-28 degrees F. to evaluate foliage. Try to spray when expected high temperature will exceed 60-65 degrees F. during the day of application.
3. Results will be best if the field has not been tilled recently. Mowing earlier in the season is a good "set up" for fall. Plan to till with sweeps, blade or plow two to four weeks after application. Late fall tillage at least 2 weeks after spraying often adds 10-30 percent reduction in weed re-growth.
4. Plan a crop, tillage and herbicide program for next year that keeps pressure on the weakened weed. Alfalfa, small grain or a late-planted annual forage crop is a better follow-up choice than corn or soybeans.
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