Proper Use of Glyphosate

Did you know that overapplication is one of the most common errors associated with the use of glyphosate herbicide, resulting in runoff to the soil, possible damage to non-target plants, and wasted time and money?  The solution:  mix a temporary dye in the spray solution to check spray uniformity and to avoid skips and oversprays.

This is one of the many helpful pointers in a new publication entitled ‘Proper Use and Handling of Glyphosate in Plant Nurseries’ by Hillsborough Extension agent Shawn Steed and UF researcher Bob Stamps.  The publication is at http://edis.ifas.ufl.edu/ep459.

The authors note that glyphosate is the largest selling crop protection chemical worldwide and the most used herbicide in U.S. nurseries.   Overuse of glyphosate and the common practice of using it alone has resulted in increasing numbers of resistant weed species.  Glyphosate-resistant weeds showing up in plant nurseries include ragweed parthenium, Parthenium hysterophorus, and Benghal dayflower, Commelina benghalensis. 

Resistance prevention strategies include using integrated weed managment and combining glyphosate with other residual herbicides that are effective in controlling target species.

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About Kathy

Program Assistant with UF/IFAS Manatee County Extension Service, specializing in Integrated Pest Management for ornamental nurseries.
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