Tick, Tock, Tick, Tock

By Bob Vavrek, Senior Agronomist
September 16, 2011

Recovery from mid-summer losses of turf will be a challenge if you wait until Labor Day to start the process.  Poa will have a better chance of establishment versus bentgrass now that days are shorter and nights are cooler.


Time is running out, along with daylight and high soil temperatures, for those still trying to recover from the turf losses caused by this summer’s heat wave.  I’m amazed that some courses are just starting to seed into thin and bare areas on greens and expect full recovery before winter arrives.  After all, the weather has not cooperated all season, so why should it start now? 


Granted, soil temperature are still pushing upper 60’s during mid-day and you might see green bentgrass fuzz on a freshly-seeded site within 10 days or so, if (and a BIG if) the mild weather holds up and nights don’t become too chilly.  Small, isolated dime- to quarter-sized areas of thin turf can recover when bentgrass creeps in from the borders, but large bare areas need seed, heat and time.  Why the pessimism?  Do the math.  Let’s say you began the process the day after Labor Day.  


Seeding bare area until you see green fuzz------------------------------------       10 days 

Fuzz grows high enough to mow a few times---------------------------------     + 10 days 

Several topdressings and mowing height adjustments 

to encourage turf to fill in between seed lines or aeration holes-------------     + weeks 


                                                                                                                 =  November 


This is assuming that you are taking the problem green out of play and raising the mowers to at least 0.180” and watering the seedlings several times a day and not getting the frost that is in the weather forecast for much of the upper Midwest.   The bottom line is – don’t count on a mid to late September seeding with bentgrass to do much good this season, especially when you continue to mow at or below 0.125” and keep the green in play.  Think of that huge dead spot as a new green and you will realize that a green seeded during mid September will not be ready to play until June or July of next season.  A winter cover might not be a bad idea, although the most benefit, with respect to increasing soil temperatures, will occur next spring. 


No doubt, the outlook is pretty bleak for courses that lost grass on predominantly bentgrass greens.  A better option may be to start patching the injured areas with sod from the nursery or the practice putting green right now if you don’t want to be patching with sod next spring.  Short days, long cool nights, low sun angles and plummeting soil temperatures are limiting your bentgrass options during a year when Mother Nature has a chip on her shoulder. 


Some hope remains for thin. bare Po annua greens that typically have plenty of live seed already in the soil.    It’s not unreasonable to expect a fair amount of recovery to occur on Poa greens during late September and October if we are lucky enough to experience a few weeks of Indian summer and some timely rainfall to compensate for the times we forget to irrigate weak greens during long periods of cool dry, weather.    


In a nutshell, this has been a very difficult season that many superintendents want to forget… but one they will likely remember for a long time. 



Source:  Bob Vavrek, rvavrek@usga.org or 262-797-8743 



Partner Links
AmEx image
AmEx image
AmEx image
AmEx image

The USGA and Chevron have committed to using the game of golf to encourage students in science, technology, engineering and math (STEM) disciplines. This commitment has led to the creation of extensive golf-focused STEM teaching tools, and has resulted in charitable contributions to support golf-related programs through Eagles for Education™

At U.S. Open Championships the Chevron STEM ZONE™ is an interactive experience highlighting the science and math behind the game of golf through a variety of hands-on exhibits and experiments.

The partnership has also produced educational materials such as the Science of Golf video series and a nationally-distributed newspaper insert which are provided to teachers as tools to enhance existing curriculum in schools. These lessons teach the science behind the USGA’s equipment testing, handicapping, and agronomy efforts.

For more interactive experiences featuring golf-focused STEM lessons, visit the partnership homepage.

Chevron image

Rolex has been a longtime supporter of the USGA and salutes the sportsmanship and great traditions unique to the game. This support includes the Rules of Golf where Rolex has partnered with the USGA to ensure golfers understand and appreciate the game.

As the official timekeeper of the USGA and its championships, they also provide clocks throughout host sites for spectator convenience.

For more information on Rolex and their celebration of the game, visit the Rolex and Golf homepage.

Rolex image

IBM has partnered with the USGA to bring the same technology, expertise, and innovation it provides to businesses all over the world to the USGA and golf's national championship.

IBM provides the information technology to develop and host the U.S. Open’s official website, www.usopen.com, as well as the mobile apps and scoring systems for the three U.S. Open championships. These real-time technology solutions provide an enhanced experience for fans following the championship onsite and online.

For more information on IBM and the technology that powers the U.S. Open and businesses worldwide, visit http://www.usopen.com/IBM

AmEx image

Lexus is committed to partnering with the USGA to deliver a best-in-class experience for the world’s best golfers by providing a fleet of courtesy luxury vehicles for all USGA Championships.

At each U.S. Open, Women’s Open and Senior Open, Lexus provides spectators with access to unique experiences ranging from the opportunity to have a picture taken with both the U.S. Open and U.S. Women’s Open trophies to autograph signings with legendary Lexus Golf Ambassadors in the Lexus Performance Drive Pavilion.

For more information on Lexus, visit http://www.lexus.com/

AmEx image
American Express

Together, American Express and the USGA have been providing world-class service to golf fans since 2006. By creating interactive U.S. Open experiences both onsite and online, American Express enhances the USGA’s effort to make the game more accessible and enjoyable for fans.

For more information on American Express visit www.americanexpress.com/entertainment

AmEx image