Peaches, nectarines and apricots: Most trees may not have fruit due to cold weather over winter. Fruit buds on peaches and nectarines are most often killed if the temperature reaches -10 degrees in the winter. The tree is fine but there will not be fruit any year with temperatures this low. Some apricots can also lose fruit buds at -10 degrees.
These fruits are also very susceptible to late frosts. As trees go from bud swell to full bloom, they become much more sensitive to frost damage. Temperatures at 28 degrees and lower will harm buds that are in full bloom.
If there will not be any fruit, there isn’t any need for being on a spray schedule. If there is fruit, use a product that contains captan or myclobutanil (Immunox, Fertilome F-Stop Lawn and Garden Spray) from now until about two weeks before harvest. Spray about every 10 days.
If a specific problem develops such as borers, peach leaf curl or gummosis, see our listing of common problems at http://hnr.k-state.edu/extension/info-center/plant-pest-problems.html . Look under “Peach” for possible problems and what to do about them.
Cherries: We often have good fruit on cherries without spraying. However, a wet spring can lead to problems with brown rot. Myclobutanil (Immunox, Fertilome F-Stop Lawn and Garden Spray) or Captan will give good protection. Cherry fruit fly may attack the cherries with the maggot causing damage to the fruit. Malathion (check label), Bonide Fruit Tree & Plant Guard or Sevin can be used for control.
Pears: Pears are often able to escape damage without spraying. If trouble does arise, use the same recommendations given for apples.
Apples: Apples are the crop most in need of a spray schedule. Unless you have disease-resistant trees, cedar-apple rust is a perennial problem. The larvae of the codling moth is the insect most likely to damage fruit. Control can be a challenge due to changing labels and an extended spray season. See our article in our March 27, 2018 newsletter on “Apple Tree Sprays” for details. You can find the newsletter at http://hnr.k-state.edu/extension/info-center/newsletters/2018/Mar27_2018_12.pdf (Ward Upham)