[{"id":2085,"date":"2026-04-02T17:45:52","date_gmt":"2026-04-02T17:45:52","guid":{"rendered":"https:\/\/blogs.clemson.edu\/upstate\/?p=2085"},"modified":"2026-04-02T17:45:52","modified_gmt":"2026-04-02T17:45:52","slug":"spray-or-delay","status":"publish","type":"post","link":"https:\/\/blogs.clemson.edu\/upstate\/spray-or-delay\/","title":{"rendered":"Spray or Delay?"},"content":{"rendered":"\n

Spray or Delay?<\/strong><\/p>\n\n\n\n

Spring arrived ahead of schedule this year, catching many producers off guard with the advanced maturity of our common winter weeds. While most of these species are typically easy to control when targeted at the correct growth stage, the recent unseasonal warmth has given them a significant jump start. Now, many of us are looking at advanced weeds and wondering: should we spray now or delay?<\/strong><\/p>\n\n\n\n

The Current Challenge<\/strong><\/p>\n\n\n\n

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Take, for example, these healthy specimens of henbit and mustard<\/strong> recently found in a newly established fescue hayfield. In this case, the producer did his due diligence in preparing the field, sowing, and fertilizing within the appropriate time window this fall.<\/p>\n<\/div>\n\n\n

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\"Field<\/figure>\n<\/div>\n\n\n

However, even the best-laid plans are subject to the weather. The lack of rainfall of this past fall persisted through the winter and into the spring, complicating management decisions.<\/p>\n\n\n\n

The Trade-Off: Chemical Power vs. Plant Maturity<\/strong><\/p>\n\n\n\n

It\u2019s tempting to look at a field of mature henbit and mustard and want to reach for a heavy hitter. Many would agree that a strong residual herbicide\u2014such as those containing aminopyralid<\/strong> (like GrazonNext\u00ae HL)\u2014would work even on these mature plants.<\/p>\n\n\n\n

While you are likely right about the efficacy, we must factor in the maturity of the forage stand<\/strong>. Most high-powered herbicides require the grass to have at least three leaves and a healthy root system<\/strong> before application. This particular stand was just barely above that maturity threshold, and it seemed risky given the current drought conditions and warmer temperatures.<\/p>\n\n\n\n

The “Mow vs. Spray” Decision<\/strong><\/p>\n\n\n\n

Beyond plant maturity, there is the critical factor of residual restrictions<\/strong>. Herbicides containing aminopyralid carry a significant restriction: the hay cannot be sold off the farm for 18 months. For many hay growers, this necessitates a non-residual herbicide<\/strong> approach.<\/p>\n\n\n\n

However, at this stage of maturity, a non-residual option like 2,4-D<\/strong> would not provide adequate control. By this point, much of the damage\u2014the robbing of water, sunlight, and fertilizer\u2014has already been done by these mature weeds. While it is always satisfying to spray and watch the weeds curl and die, the current drought makes it a real challenge; we need actively growing weeds for maximum herbicide uptake.<\/strong><\/p>\n\n\n\n

In this case, the decision was made to wait and mow the field at a high height<\/strong>. This strategy offers several benefits:<\/p>\n\n\n\n