The last few days with unseasonably warm temperatures and drier conditions, we began spraying our fairways with our pre-emergent product Ronstar which is the best product on the market for our 27 acres of fairways. This has to be done during dormancy or when the warm season turf is at rest so the herbicides have little to no negative effects on the turf. There are less expensive products than Ronstar on the market but these products disrupt root growth and or could further damage areas that have been weakened by shade, traffic and excessive moisture issues. Our fairways are the largest area of tightly mowed turf on the property and are a significant feature of our course. This is why we are using this products as well as making a concentrated effort in reducing the impact of bermuda contamination we have in the fairways. Our Bermuda Eradication Program as you know involves spraying other selective herbicides that negatively effect the bermuda throughout the growing season and replacing larger patches with new Zoysia sod.
We also use a non-selective herbicide Prosecutor(Round Up Generic) in the mix in winter which will kill the poa annua which has germinated in the fairways since last fall. If we did not kill these spots of poa on the fairways, they could become pretty large before we begin mowing and disrupt your lie on the fairway and will also contribute many more seeds to the weed bank in the fairways that we continually fight.
It will take about 2-3 weeks for the chemical during cooler temperatures to begin to show the effect of the Prosecutor. The pre-emergent is for crabgrass/goose grass weed control to prevent them from establishing in our fairways. The weeds actually germinate and then when the root of the weed comes in contact with the chemical it kills it. We will also be spraying our tees and range tees as well.