How to Manage Pests
Pests in Gardens and Landscapes
Fertilizing stone fruit and pome fruit
Maintaining a good fertilization program can keep your plants vigorous and help prevent infections
of bacterial blast or canker, oak root fungus, and powdery mildew.
As a general rule, nitrogen
should be applied annually, usually during the growing
season. To improve fruit quality and color, nitrogen
levels should be low but not deficient as the harvest
nears. Nitrogen fertilizer can be applied in the spring
or split between spring and just after harvest. Excessive
nitrogen can cause softer fruit, poor fruit color,
and reduced storage and shelf life; it can also increase
problems with numerous pests. Typically, mature trees
should receive about 3 to 5 pounds of ammonium sulfate
per year or 2 pounds of urea per year depending upon
soil fertility and local growing conditions. Apply well
away from the trunk and water thoroughly after application.
Zinc is also commonly deficient. Affected trees have small new leaves. This deficiency is best
corrected by spray applications. Spray with a "chelated zinc" during the growing season.
Repeat if new growth still shows deficiency symptoms.