Service Berry Disease
My service berry flowers, forms berries and they then get a disease, dry up and never ripen. Before getting dry the berries are covered with a fuzz-like growth which is orange-ish. What can I do to get the berries to ripen? This has been a perennial problem. Can i cure it?
You are describing a rust disease that commonly infects amelanchier (serviceberry or shadbush). Many members of the apple family such as serviceberry get rusts. The rust disease has an alternate host which it infects part of the year and then moves back to re-infect the serviceberry. Your best bet is to reduce the amount of infectious material in the area.. Try to remove the alternate host plants. Also, give your tree as much good air circulation as you can by pruning back other plants.
Here is our webpage info: http://extension.umd.edu/hgic/rust-diseases-trees-and-shrubs
And here is some supplemental help from Penn State: http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/cedar-apple-and-related-rusts