Understanding Growth Regulator Herbicide Injury

Plant growth regulator (PGR) herbicide injury can occur by misapplication to crops, drift from adjacent fields, or from spray tank contamination.

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PGRs include the following herbicide families and active ingredients:13;10;

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  • Phenoxy Acetic Acids (2,4-D, 2,4-DB, MCPA, MCPP)
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  • Benzoic Acids (dicamba)
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  • Carboxylic Acids (clopyralid, fluroxypyr, aminopyralid, quinclorac, picloram, triclopyr)
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There are many products and trade names with these active ingredients, including package mixtures.

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PGR herbicides control weeds by the disruption of several plant growth processes, including protein synthesis, cell division, cell enlargement, and respiration. These herbicides are widely used to control broadleaf weeds in grass crops such as corn and wheat. They are usually applied to foliage, but can also be effective in the soil. The herbicides can move in both xylem and phloem to areas of new plant growth. As a result, these herbicides can be effective for the control of annual and perennial broadleaf weeds and brush.

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See what RoundupReadyPLUS.com has to say about growth regulator herbicide injury​.​