Disease
Watch 
Disease
Watch
July 2005
Current
Problems
Future
Problems
Dutch elm disease and oak wilt continue to take their toll across the state.
The key to managing this disease, and to prevent a repeat of this next year,
is to remove infected trees, and grind the stump. This ends the cycle of both
these diseases by eradicating the fungi that cause them.
With
the sudden change to a cool, wet spring, reports are filtering in from across
the state about many different foliar disease problems. "Frustrating
Foliar Fungi"
was written last year to address these same problems and concerns. Only in Minnesota
could we have powdery mildew and downy mildew problems at the same time!
Because of the long, wet spring and summer, we are still advising people to
not trim their oaks until August, if necessary. Pruning of American elm is
discouraged, too. If pruning is necessary due to storm damage or other unforeseen
circumstance, remember to paint wounds to prevent beetle transmission of the
fungi that cause oak wilt or Dutch elm disease.
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