Powdery mildew, caused by the fungus Oidium neolycopersici, is also common in humid Iowa greenhouses with poor air movement. Characterized in the early stages by white patches on the upper surface of leaves, this disease can cause defoliation as the spots develop into brown lesions.
Increasing air circulation and spacing between plants will reduce powdery mildew problems. Fungicide sprays also can be effective if used when symptoms are first noticed. Good control of powdery mildew can be achieved by using several fungicides. Fungicides are most effective when sprays begin as soon as the first symptoms are noticed, rather than after the disease is already well established.
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