As we head to the peak of the difficult weather here in the Mid-Atlantic,
every decision can have consequences that we must live with for the rest of the
summer. Making sure the greens are taken care of in every regard is our highest
priority because they would not heal quickly from damage. Similarly, the rough,
collars, and even Bermuda grass need monitored closely. At this time of year,
it is a delicate balance making sure everything is in the best condition
possible.
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Footprints coming off #18 green, through the approach.
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Historically we have had a problem with goosegrass on the
putting greens. Goosegrass has recently become one of the most difficult to
control weeds of all. It is especially difficult to control on putting greens
because of the sensitivity of the putting green turf. A new product came out
several years ago that does a fantastic job of killing goosegrass. We tested
and tested it for use on putting greens and it has shown to be very safe. In
fact, we have been using it on greens now for 6 years. However, one of the
drawbacks of this chemical is that it is also very toxic to Bermuda grass.
For most courses, with all cool season grasses, a chemical
that kills goosegrass and injures Bermuda grass, would be a godsend. Two of the
most troublesome weeds on a lot of courses, managed with one spray. But we don’t
want to injure our Bermuda grass so we must apply the chemical with as little
overlap into the Bermuda grass as possible. We can minimize the amount that
touches the Bermuda grass, but some inevitably still does
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Up close picture of the bleached Bermuda grass |
We spray the chemical at VERY low rates- .06 oz per acre.
Put in terms that might be more relatable: we mix 6 mL, or about 1.25 teaspoons,
in 225 gallons of water and those 225 gallons cover 3.75 acers of turf. At this
low of a rate, it is safe for the greens, but still damaging to the goosegrass
and Bermuda grass.
Bermuda grass is very difficult to kill- cold weather is about
the only thing that can really keep it in check. Most herbicides will only set
it back, including when we treat the greens for goosegrass. When the chemical does
get on the Bermuda grass it turns it bleach white. Some of you may have noticed
the white marks in #18 approach. These were made from me walking off the green
after spraying for goosegrass. A small residue stuck to my feet and as I walked
through the Bermuda grass approach, it was still concentrated enough to bleach
the grass (Don’t worry- this only happened due to it being immediately after
the spray was applied- chemicals are not sticking to everyone all day!) The Bermuda
grass will grow out of this, it wasn’t a high enough rate to really injure the
turf. But this is just one example of how fine of a line we are walking during
the heat of the summer. Too much chemical or sprayed in the wrong place and
thousands of square feet of Bermuda grass could be as white as these
footprints.
In the end, we have developed a program and the goosegrass
issue on putting greens has been reduced to an occasional nuisance. Nevertheless,
we continue to treat for the weeds, so they don’t return to a bigger issue. In
doing so, we balance between keeping the goosegrass out and making sure the Bermuda
grass doesn’t turn white.
Happy 4th of July
Etiquette Reminder of the Month
When parking your cart at a tee or green, please keep all 4
tires on the path.
This is the same etiquette reminder we posted in April, but after
seeing carts all over the grass around tees and greens it felt like time for a
reminder:
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If you don't park your car like this in your driveway, don't park your golf cart like this here. Thank you
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Also, as part of a Golf Committee initiative to improve
course etiquette, we have included links to videos teaching proper on course
etiquette. Please take a moment to watch:
Ball
Marks - How to properly repair
See you on the course!
Joe
jvillegas@bwrc.org