Once the problem has been identified, growers should take larger samples to determine if the insects are present in sufficient number to warrant control. Trees need only to be sprayed when population numbers are above established economic thresholds. Mice and rabbits will feed on the bark on the tree over winter causing severe damage which usually kills the tree. This list is some of the more common diseases which affect apples. Following is a list of other diseases which are known to attack apples.
Chemical control is available for some.
The removal of diseased, damaged and unproductive areas of the plant will help the trees support a higher yield of fruit and resist damage from prevailing winds. Pruning opens the canopy inside of the tree allowing for better airflow and more uniform ripening. Training Training is necessary after one year of growth to shape and help develop the form of the plant. An untrained tree usually produces less fruit than trained trees. This is usually done through the use of trellises.