I have been using a product called sucker-stopper RTU
for a few years on some fairly young trees with no ill
effects so far....I believe its made by Monterey.

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"Kurt Ullman" wrote in message
...
I have a Hawthorn and two crabapples that are getting those little
growths that look like small limbs growing out of the roots. Putting
down the plastic liner (or whatever it is made out of) doesn't work. I
would like to use something that would kill the suckers while obviously
leaving the tree intact. Any suggestions?