Small Horticultural Farm: Pest and Disease Identification Key
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Small Horticultural Farm: Pest and Disease Identification Key
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SPINACH
GRAY OR PURPLE MOLD ON THE UNDERSIDES OF LEAVES.
Cause: Downy mildew (Peronospora effusa), a fungal disease.
Treatment: Disease outbreaks are often worst during cool, wet weather and severe outbreaks can destroy entire fields within several days. Disease is also worst in poorly drained fields with standing water, or when leaves remain wet. For this reason overhead irrigation should be avoided. Approved copper fungicides are available, as are resistant varieties. Different disease "races" appear periodically and new resistant spinach varieties are in constant development.
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