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Tips
Diseases, Powdery
Mildew:
Powdery mildew is a disease that
attacks a number of ornamental plants. Conditions favorable for powdery
mildew include warm humid overcast days with cool nights. Given these
conditions powdery mildew is most common during late spring and early
fall but can occur anytime during the growing season. This disease is
common on plantings that are crowded, damp and shaded. Powdery mildew
initially appears as a white to grayish-white coating on leaves, shoots
or buds. As the season progresses, the powdery mildew coating is dotted
with small dark brown specks (fruiting bodies).
Severely infected leaves may yellow, curl, and then drop. Cultural
practices for controlling this disease include using resistant
varieties, increasing the plant spacing and prune. Increasing plant
spacing and pruning increases sunlight penetration and air movement.
Also, lightly fertilize to minimize excessive growth. Lightly spraying
the leaves with water can wash off some of the mycelial spores present
on the leaves.
Diseases, Red Thread:
Red thread continues to be present on many home lawns in the
northern United States.
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TechNotes
is part of the Lawn & Landscape Contractors Program offered by
Novartis Turf & Ornamental Products. Contractors interested in more
information on the program can e-mail joseph.dipaola@cp.novartis.com.
More information on Novartis products is available at http://www.cp.us.novartis.com/products/lawn.shtml
TechNotes Volume III,
Issue 22, June 1, 2000
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