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Powdery mildew can be a serious foliar disease in some years and some locations ; for control of powder mildew or another specific insect or disease pest , contact your county extension office . A cleft graft , bottom right , covered with asphalt grafting compound is used for topworking established apples and pear trees . The primary drawback to the seedling pear rootstock , however , is that it produces a fairly large tree , 25 or more feet tall at maturity . Because of this , if you have a confirmed case of Verticillium wilt ( check with your county extension office ) , remove and destroy the infected plant . Instructions for taking a soil sample , and containers for sending a sample can be obtained through your county extension office . Before each cut is made it is advisable to dip the pruning shears in a 1:10 chlorine bleach : water dilution . Test your soil for pH and nutrient needs ; professional soil testing may be done through your county extension office .