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Scab spores overwinter on fallen apple leaves , so removing all leaves from under the tree in autumn can lessen the severity this disease , although it may not prevent it . A number of the spots may run together so that the leaves appear irregularly blotched . Therefore , plan to plant two or more varieties of apple , unless there are ornamental crabapple trees or other apple trees in your neighborhood . If you plant a pollen-sterile variety , you may need to plant a third variety in order to get fruit on all three pear trees . Alternately , use one hand to hold the spur and the other hand to lift and twist the fruit . Alternatively , use one hand to hold the short , thick fruiting spur that bore the apple , and the other hand to lift and twist the fruit . Apples with punctures or bruises should be avoided or used first , since they will not store as well . It is unlikely for geranium rust to survive winter outside in Minnesota , but removing infected debris may help prevent infections the following spring . These chemicals will kill the beetles present at the time of application , but may not prevent additional rose chafers from attempting to feed on treated plants . Since high humidity is an important factor , certain cultural practices can help prevent the disease , or decrease its severity . Careful pruning will help prevent disease infection .