Gary,
To go off something that Bill was talking about, we got to about 3 years on our Tifeagle and the thatch accumulation just went sky high. We are currently verticutting and topdressing every 2 weeks, just to try to keep the thatch from getting out of control. This also includes 3 aerifications with the biggest tines they make. This is even with much lower recommended nitrogen levels. I know of several guys that would love to have there old tifdwarf back!
The reason for all the v-cutting and topdressing to to try to remove the thatch and replace it with sand. The sand will allow for a firmer, smoother surface. Too much thatch makes for a surface that feels spungy and soft. In return, the thatch will not allow nutrients to penatrate the soil, will not allow for lower mowing heights, (because it will scalp severely) and hold water. If one lets the thatch get out of control, it can take year to regain a firm surface without re-grassing. It's a very nessesary evil, especially since we do overseed and none of this is done during the months of October -May. Overseeding only aids in gaining more thatch with cupping that do not get into the bucket and nitrogen for the poa triv. That's why we have to be so agressive in the summer months.
This is a question that I've been thinking about alot recently-If a golf course does overseed and is north of Florida, why not have bentgrass? Considering all the verticutting, topdressing, sodding and "babying" that has to be done to bermuda grass greens, why not just put in bentgrass and have to handwater greens 3-4 months out of the year? I really think that a course would have a better playing surface year round as opposed to a course that overseeds. By the time we overseed and get out greens back to where we expect them, it's almost 2 month! Come the first of May, we begin to transition and sodding areas that didn't hold up during the winter. We figure on 4 or 5 days to have a very good surface after we v-cut and we do it every other week....I really beleive that Bentgrass will alway be superior to a green that's overseeded. Now, like Bill was saying, a course that doesn't overseed it's greens...a bit different story....
Tom-The two courses down here are very strict about handwatering only with a light cycle at night. The approaches are treated like the greens when it comes to topdressing and v-cutting. I last played on them in April and actually thought that they were too firm...They do as good of a job as anybody.
Tony Nysse
Sr. Asst. Supt.
Long Cove Club
HHI, SC