Leave rust fungus disease can be minimized by dispose off the affected leaves, improved air flow during growing season. This fungus likes hot and humid conditions, so if you saw the leaves starting to show rust spots, you can spray fungicide on the leaves on both sides. If that does not work, you can cut off the affected leaves and put them in the garbage can for disposal. Do not leave them on the ground. The best time to apply fungicide as well as Neem oil is winter time.
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