Same Story Different Week With Course Being Closed and Winter Dormant Zoysia Spray

Well, sorry to be the bearer of bad news but conditions remain  frozen and or thawing here at Glen Echo. Just beginning to thaw today and I only give it a 1/10 of 1% chance of playing on Valentine's Day so I guess some would say there's a chance. Looks like snow and some colder temperatures over the next few days so golf looks like a no go for a bit longer.

We were out spraying some fairways, tees and approaches with our dormant herbicide spray. The turf must be dormant because we are spraying a non-selective product that injures and or kills green weeds and or grass. We are trying to kill any poa annua that has germinated on these surfaces and it also will kill any knot weed that has germinated. It appears the knot weed is still sleeping from the cold weather. If allowed to grow in the fairways during the spring, poa annua seeds profusely adding the more plants and can get rather clumpy before the fairway units beginning mowing. It also can invade more shaded areas and slow the health and progress of the zoysia Poa becomes active pretty quickly during warmer, sunny weather in the winter to early spring. A few days in a row over 45-50 and it becomes active. The plants will absorb the spray from the warmer weather as it becomes more active. Even if the temperatures turn cold, the chemistry is designed to stick on the leave of the plant and when it becomes active a few days later it will begin to kill the plant. The spray will show up over the next 2-3 weeks by yellowing the plants and will turn orange, brown and then die. Poa annua has a long growing period and reproduces millions of seeds. It loves moisture and shaded areas for the most part but will live in full sun is well so it is very adaptive.

We put a second product in the tank that helps to prevent crab grass and goose grass which germinate into the spring and summer. The product we utilize binds itself to the soil which allows it to be sprayed now and is on the soil surface when needed during April,  throughout the summer. Microbial activity begins to break down the product by the end of the summer but the zoysia is rather tight and keeps the soil surface shaded. Thinner areas of zoysia can develop some weed infestations because the soil is exposed to light and more moisture which can germinate weeds. We try to place enough product on the surfaces that will prevent weeds from germinating through August into September.

We were able to spray holes 1-7 today and the tees associated with those holes.

Below is a video with discussion regarding this spray application.

https://www.youtube.com/watch?v=tyMgXCVZPKo

Warmer Weather, The Dilemma, To Allow Play on Frozen and or Thawing Greens

Well, it won't be a stampede but I'm sure there are a number of minds out there thinking 50's in the middle of next week, lets play some golf!! Not so fast my frozen St. Louisans.

Throughout my time at Glen Echo, I've been pretty tolerant with winter play, especially on frozen greens. It's when our greens begin to thaw that the stop sign will usually come out of my pocket. We place two holes in every green in winter to help with spreading wear out if greens remain frozen. There are occasions where play is allowed out on frozen greens.There are also times when the greens for the most part remain unfrozen and we don't have to worry much about freezing/thawing cycles.
The winter of 2018 is definitely a frozen year!

This past fall and early winter we've had significant drought conditions which have not allowed the roots to grow properly. The fall and early winter are the 2nd best time of year for shoot (top growth) and root growth of cool season grass(Bentgrass) on our greens. This season, some of the root mass has been reduced because of drier than normal conditions. As you can see illustrated in the picture below, the late winter and spring are the prime time for root and shoot (top growth) so there is plenty of time for recovery as long as we don't create additional injury in winter.

Cycle of growth in cool season turf.(shoot) top growth and root growth balance for the time of year

. Pic credit Milorganite.

As greens begin to thaw in the profile, there is a thawed layer and then frozen. As golfers walk on the green surface, the surface moves under their feet and roots are torn or sheared off at the interval of thawed and frozen turf. The deeper the thaw goes into the turf, the less susceptible the turf is to this issue.

Another thing that happens is that the moisture that has built up on or near the surface needs to drain through the canopy. Our sand layer is approximately 6" deep. If the deeper area 4-6" deep is still frozen, water cannot evacuate from the surface area creating a significant sponge effect on the surface of the greens. High moisture on or near the surface leads to foot imprinting which can be very disruptive and noticeable for weeks.

All of the above is dependent upon how slowly/quickly the freeze comes out of the greens. It varies during every freeze/thaw cycle. We will check the greens daily and notify the pro shop of availability of play or no play. One of the things you could do if the course is not open is to come out and hit a few range balls to get some swings in.

With the potential of freezing rain and an ice layer forming on the greens, we might not get an opportunity during this thawing cycle to open for play.