Quote:
Originally Posted by barnetmill
I am wondering if grafting to something else would defeat borers
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Feeding them regularly with a standard array of micronutrients containing (among other things) zinc and copper will increase the trees defenses. Treating them quarterly with a nicotinoid as a soil drench for a couple of years will eliminate the borers. There is an over-the-counter version of Imidacloprid that is rated for fruit trees. Use only as a soil drench to avoid harming bees.