About 3 weeks ago we sprayed a product called Tenacity on our cool season tees and 13 fairway to control the goose grass and crabgrass in our turf. What this product does is shuts down the plants HPPD an enzyme in the biosynthesis of carotenoids. This enzyme protects the chlorophyll, the pigment in plants responsible for photosynthesis from too much light energy. Without carotenoids, light destroys chlorophyll causing new growth to turn white resulting in death of plant. As we mow the white becomes less and less visible as it kills the grassy weeds Here are some links to information on Tenacity:
Active Ingredient
Whitening of Weeds
Crabgrass Whitening off on Cool Season Tee
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