Short-season-NYC/Zone-7b, containerized trees, (18-gallon tubs), modified 5:1:1 growing mix:
"ESPOMA, IRON-TONE"...slow release organic fertilizer.
l cup Granular Limestone, as a top dressing, to counteract fertilizer acidity...early-Spring, mid-Summer, and Sept-Oct.
Tonic: diluted (1 tbs./5-gallon/water) Miracle-Gro 24-8-16....Water trees with this tonic, once per month, until mid-July.
Results: Healthy growth. Lush growth, thick, dark-green, leathery, leaves that seem to resist rust, etc. I also pinch back new growth, leaving only 5-8 leaves. No breba allowed to develop.
Note: When watering my trees I avoid wetting the leaves, especially, on cloudy days, or, in the evening hours. Wet leaves = rust infections.
I also prune trees to allow for extra air circulation, and remove all dried, and dead leaves from around trees.
Frank