12/15/2014 12:12 PM
Ultradwarf Bermuda is not quite the same as 328 or tifdwarf as you are finding out. They are a "dwarf" plant and by nature all plant features will be dwarfed when compared to 328...or even tifdwarf. I would take a soil slab profiler or a cup cutter plug from a green with 328, tifdwarf, and mini verde and wash off the soil to get a better picture of what is going on so more accurate comparisons can be made. I find the small probes never give me an accurate gauge of what is going on below except for soil moisture.
If you haven't already, send a few samples to a lab (UFL is good) and check for decline or other pathogens as well as nematodes. All of the ultradwarves are more susceptible to decline (and nematodes) vs. 328.
Also, your mini verde will produce a lot more organic matter than both the tifdwarf or 328, which can lead to excessive OM in the top of your rootzone causing you issues. If you are maintaining all of your greens the same way, this may be your issue.
Finally, what is your current fertility strategy? Better to see what you're currently doing rather than shoot in the dark.