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Some apple varieties produce strongly vertical growth and need more training ; others tend to produce branches that are naturally well-angled . Spots may appear as small elongate reddish areas that enlarge to lesions with gray centers and reddish borders and may develop into extensive zonate cankers . Pruning and Training Pruning for Fruit Production Pruning a tree grown for fruit is somewhat different than it is for a landscape tree such as a birch . Geranium rust is a foliar disease affecting plants in the genus Pelargonium , including cultivated geraniums . A budded apple shoot completely wrapped with rubber budding strips , top right . Since the deer may become desensitized to the soap over time , you may need to periodically change the brand of soap . Closer planting will make training and management of the trees difficult , and the trees may shade each other so that fruit quality is harmed .