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Preemergence Weed Control in Bentgrass Putting Greens

(By Jared Hoyle, KSU Turfgrass Research and Extension)

In the previous post about preemerge herbicides there is a table of many preemergence herbicides that available for professional turfgrass managers.  But when we start talking bout preemerge herbicides that we can use on bentgrass putting greens the list gets really short.  There are not many options out there for PREs on creeping bentgrass putting greens due to the injury they can cause to the putting surface.

Every golf course superintendent knows that one of the main priorities on the golf course is the putting greens. Therefore, weed control on the putting greens is a priority as well.  So lets just to go over some of the PREs that are labeled for creeping bentgrass putting greens and I will also mention one comment about each.

  • bensulide (Bensumec 4FL, Pre-San 12.5G, Weedgrass Preventer) – With this product you are not able to reseed for 4 months and do not use on greens that have more than 50% annual bluegrass.
  • bensulide +oxadiazon (goosegrass/crabgrass control) – To prevent injury apply two half rate treatments 10-14 days apart.
  • dithiopyr (Fertilizers w/ dithiopyr) – Older bentgrass varieties may result in undesirable injury.
  • siduron (Tuperson) – May be applied at time of seeding or to established creeping bentgrass for crabgrass control and bermudagrass suppression.

Also, you can see the list is a lot shorter then the list in the previous post but that is why managing bentgrass is so difficult.  Turfgrass managers must to do whatever they can to have a healthy growing creeping bentgrass system to prevent weeds coming in because once they are there, there isn’t many options to git ride of them.

Information in the previous list was acquired from “Turfgrass Weed Control for Professionals” by A. Patton and D. Weisenberger, Purdue University (and 11 collaborating states including Kansas). For more information about purchasing this publication see;

https://blogs.k-state.edu/turf/new-weed-control-publication-for-turfgrass-professionals/ 

Always remember to READ THE LABEL for the correct rate, turfgrass tolerance, and specific instructions before application!!!

***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***

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