Spray fruit trees. None of our fruit trees are native to our areas, so they need a little extra care right now and will benefit from a spray schedule to prevent diseases. Apple, peach, pear, apricot and plum trees need to be sprayed regularly. There are different sprays to be applied at various times throughout the cool months, so be sure to check with your local county extension office or trusted nursery about when to spray your fruit trees to keep them healthy.