Friday, May 25, 2012

Poa suppression on greens

Poa suppressed by growth regulator
On your next visit to the course you may notice the funny colors on the greens, most obvious will be the putting green.  The putting green has a large amount of Poa annua, or Annual Bluegrass.  This Poa in being suppressed with a growth regulator that is causing the yellow, orange and red Poa is a native species and a desirable putting surface in many parts of the world.  However, for golf courses trying to grow Bentgrass greens, it is considered a weed.  Poa grows much faster than Bentgrass so ball roll is negatively affected if left unchecked.  The agronomy staff has a comprehensive program involving both chemical and cultural methods to suppress the Poa and encourage the Bentgrass.  One of the most effective ways to discourage the existing Poa is to use growth regulators.  This product is just starting to take effect and the symptoms are beginning to show.  Poa under the control of this product has a stunted, yellow-orangish appearance.  This will allow the unaffected Bentgrass time to creep into these spots of Poa and fill in.  The effects of this product will last for 4-6 weeks at which time the natural stresses of summer in Oklahoma will continue to stress out the Poa.  We will resume this program in the fall once temperatures begin to decrease.  As always if you would like any further information, please do not hesitate to ask.

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