By Teo Spengler If your quince fruit is cracking, you are not alone. Quince fruit split is not uncommon. It happens where one or more quinces split, creating openings through which diseases and pests can attack otherwise healthy fruit. Quince fruit split is a condition often caused by water supply issues. Read on for more information about the causes for splitting quince fruit. Quince Fruit Tree Problems Quince are small, irregularly shaped trees that grow to some 15 feet high. They bear dramatic flowers on the tips of the shoots in hues of white or bright pink. Quince trees are hardy in U.S. Department of Agriculture plant hardiness zones 5 to 9. Quince trees are vulnerable to various quince fruit tree problems, including: Fire blight Borers Codling moth Curculio Scale Tent caterpillars The fruit itself can suffer from quince fruit split. In fact, fruit split in quince in quite common.