To be effective, the mixture should contain a fungicide, an insecticide and a miticide. For dosage rates, follow label directions. Most important sprays. This disease is caused by a fungus that requires both red cedar and apple or quince to complete its life cycle. Infection on apple leaves and fruit produces bright orange spots.
Infection can result in severe leaf drop.
It is a problem more on older trees in the northern areas of Delaware. Apply ferbam with the other suggested materials during these sprays. This insect is probably the most destructive pest attacking backyard apples. Unless controlled, apple maggot can be counted on each year to injure apples and pears. Soon the eggs hatch and tiny maggots tunnel through the apple flesh, leaving brown, winding galleries.