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.|