Answer: You might try using Sucker-Stopper RTU. It is made from the plant growth regulator napthaleneacetate (NAA). This product is widely used in commercial agriculture to prevent suckers and as a thinning agent on fruit trees. Prune off the suckers, the thoroughly cover the primary wound or where the existing sprouts have been removed. Be sure to treat before new growth suckers are 10 inches in length. The earlier you treat, the better. Control should last about 3 months.
You should be able to purchase Sucker-Stopper RTU at your local garden center or nursery.
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