Anyone know about this?

http://edis.ifas.ufl.edu/hs196

Scroll down, Kuharske is the 3rd listed root stock. - Millet (865-)

Sounds like it is still kinda new. Does anyone have any personal expierence with this.

Kuharske is rapidly moving into the #2 rootstock position in Florida (after Swingle). It is in all ways identical to 'Carrizo' except for its enhanced resistance to burrowing nematode ('Carrizo' was originally considered resistant, but over the years, the nematodes mutated to become able to feed on it). And of course 'Carrizo' is in all ways identical to 'Troyer' except for that original nematode resistance. So if you don't have burrowing nematodes in your soil, the 3 rootstocks will appear to be the same thing.

how do one know if they have nematodes in their soil? or know if the nematodes one does have are the bad ones.

Good nematode information.

http://edis.ifas.ufl.edu/ch051

From my limited information almost all soils have nematodes and many are good and necessary for soil health however there are bad nematodes for which rootstocks have been developed to stop the nematode problem. As with almost all cures there will always be a few of the targeted problem that will defeat the cure and they will go on to propagate and thus their successive generations will be more and more resistant to the cure resulting in the need for newer rootstocks. Having said that, the Burrowing Nematode is one tough critter. It resides in central Florida where there are deep sand soils much like what I have where I live. I certainly hope that the little guy doesn't take a vacation on some of that new Citrus I'm buying soon and move up here. I understand that is why Florida is so tough with their rules and regulations and yes even laws (they take this stuff seriously) on Citrus imports, exports, cultivation, propagation and vending. I don't think there has been a lot of success fighting the Burrowing Nematode. If I'm wrong I hope it is the last sentence that is wrong.

That's my nickel tour.

The burrowing nematode, Rhadopholis similis, comes in several biotypes, throughout the world, but the only type that feeds on citrus roots exists, as far as I know, ONLY in limited areas of Florida. So outside of Florida, it's a non-issue, as well as in most areas of Florida, where we don't have it. Here, where we have BN problems, we solve them with a resistant rootstock -- Kuharske or Milam, generally. You can still grow a good tree with those stocks. On susceptible stocks, Nemacur will knock the populations down, but you never eliminate them. Temik aldicarb and other systemic nematicides have little or no effect on them.