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I have a 30 year old aristocrat pear tree that for the first time the berries that were produced this spring or either did not fall off last winter have a soft spiked orange growth on them that falls off like pollen and the driveway and ground around it is colored orange. the tree looks healthy otherwise with just some insect damage to some of the leaves [holes]. Any idea what this might be ?
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Since it usually only affects the fruit and Callery pears do not set a lot of fruit, I wouldn't think you would need to worry about controlling the disease. You could spray your tree with a copper fungicide in the spring when you notice the orange blisters on the branches of the cedar trees. The problem is that these are much less visible than the larger cedar-apple rust galls.
Here is some information on this fungal disease with some photos of the cedar-quince rust lesions on a cedar branch and a photo of how the cedar-apple rust looks when it is infecting a young apple. This is similar to what the cedar-quince rust might look like on your pear fruit. This information is from a blog post I wrote on the cedar rust diseases: https://viettes.wordpress.com/2011/04/2 ... %E2%80%A6/.