Bunch disease on Pecan

Does anyone know anything about bunch disease (witches broom) on pecan trees? I have got it in several of mine. I cut one of them down because it looked awful and it was all over the whole tree. The other trees only have it on a few branches. Will continue to spread? If I cut out the infected branches will it return later? I have one younger tree about 8 inches diameter that has in it one branch. Should I just go ahead and get rid of the whole tree while it is small? Any advice will be appreciated.

Bunch disease affects black walnuts, pecans, and hickories and is especially serious on butternuts, Japanese heartnuts, and hybrids of butternuts and Japanese heartnuts. The causative organism and the method of transmission are not known, but some scientists suspect that a virus or a mycoplasma is involved.

Lateral (side) buds have a tendency to grow rather than remain dormant. This produces a "witch's broom" type of growth on the infected branches, characterized by bushy, closely spaced lateral shoots with undersized leaves. Upright, suckerlike shoots form on the trunks and main branches.

Infected branches frequently start growth earlier than normal in the spring and grow longer into the fall. This late fall growth retards normal cold-hardiness development, and the tips of infected branches are winterkilled. Branches infected with bunch disease do not produce normal crops of nuts.

For control, cut out the infected branches, making the cut well below the infected area. If the disease continues to spread into other branches, remove the entire tree.

From http://www.extension.uiuc.edu/~vista/html_pubs/NUTGROW/diseases.html
http://www.ipmcenters.org/cropprofiles/docs/lapecans.html
http://www.na.fs.fed.us/pubs/silvics_manual/volume_2/carya/illinoesis.htm

Bunch or rosette problems in pecans is often a signal ofl zinc deficiency, though if you're getting witches' broom growth, it may be a mycoplasma, as Farmerdill suggested

http://www.alabamapecangrowers.com/Members/Diseases.asp
http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/odin003/odin003.htm

Wouldn't cutting infected branches make entry points for decay? I guess if it would prevent the spread than it would be worth it.