Monday, August 23, 2010

Maple anthracnose may be due to spring weather.

Anthracnose is the term used to describe a disease that causes limited, sunken dead spots such as those on these maple leaves.  The disease organisms involved vary with the plant but they all require the same environmental conditions, wet and cool spring weather.

This year's spring was ideal for these diseases.  Control is an option that requires frequent sprays from bud break until the weather conditions change.  As soon as warm weather arrives the infection cycle of the disease organism is shut down.

At this time of year there is no reason to spray.  Cleaning up the leaves in the fall may reduce a source of this disease for next year's infection cycle.  

The sprays and spray schedule recommended for Sycamore anthracnose should be followed if you want to prevent anthracnose.  If next spring is warm and dry, there is no reason to spray.

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