Q: We have a fruit cocktail tree (plum, peach, nectarine) planted 5 years ago. It blossomed and had fruit but fruit developed a gum-looking disease and fell off. Many branches are infected with black-looking stuff.
I don't have good news. All fruit on your grafted tree are susceptible to black knot; affected limbs must be pruned out.
Infection occurs April-June, especially on current season's growth.
Remove all knots and swellings by pruning 3-4 inches below the knot during dormancy before April 1.
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