resistance

Preferred Evergreen Varieties

After a severe winter and the third cool, wet spring in a row, many home gardeners know firsthand the problems associated with growing many species of evergreens.

In an earlier newsletter this spring, junipers were on the list of evergreens experiencing problems with diseases. One of the main ways to avoid disease problems is to plant disease resistent varieties when available.

Apple Scab Resistant Crabapple Varieties

The cool, wet weather this spring has created ideal conditions for the development of apple scab on susceptible crabapple varieties. Scab is caused by the fungus Venturia inaequalis. Initial symptoms are small olive-green to black spots on the foliage. Eventually the leaves turn yellow and fall from the tree. Highly susceptible crabapple varieties may lose most of their foliage by midsummer. The heavy defoliation will weaken the trees somewhat, but will usually not kill them. The damage is mainly aesthetic. Heavily defoliated trees are unattractive.

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