Spraying Collars with Bermuda Contamination As Well As Some Fairways

Last week, Tom sprayed the collars that had bermuda contamination in various stages. We still must backpack spray areas that have zoysia next to them because the chemical is harmful to zoysia so we will do it very carefully with our small sprayer where bermuda has contaminated the collars next to zoysia.

This week the bermuda has turned white if you have been out to the course the past few days. The chemical used (Pylex) disturbs the cartenoid biosynthesis. Carotenoids serve two key roles in plants. They absorb light energy for use in photosynthesis, and they protect chlorophyll from photo damage. By turning white, the chemical is disrupting chlorophyll production in the plant. We are applying this product at 1/2 ounce per acre because it is being applied over the top of bentgrass. It can damage the bent so we are going with lower rates to offset injury to the bent. Standard use rates on more tolerant species are only 1 to 1.5 ounces per acre so as you can see a highly effective product at low dose rates. We must do 3 consecutive applications over about 1 1/2 months to kill the bermuda. Of course, you must then go after the bermuda that is outside the collar so it is an on going process.

Collar on 10 turning colors from green to white. Part of the plant is still green. Successive sprays should for the most part kill it.

This is a section a few feet away in the approach that was not sprayed.

I also sprayed 3 fairways with our fairway eradication product last week. You are beginning to see some changes in fairways 1-3 and a little on 18. The bermuda in these areas will turn a little reddish as the chemical works its way into the plant. I'll have pictures of this over the next few days as the chemical begins to do some damage to the bermuda. I need to spray other fairways but rain and high heat have gotten in the way. I'll probably spray them right before Echofest so it does not disrupt the color until after the event is over. We also must get these sprays completed before the zoyia grass goes dormant which could effect its ability coming out of dormancy next spring.