![]() Infects foliage and produces spores on the underside of the leaf.Survives in southern production states and in greenhouses that grow cucurbits, and moves into Midwest production fields during the growing season.The pathogen is “obligate” and cannot survive without a living crop.Leaf yellowing turns brown as infection progresses.The “dirty” or “fuzzy” appearance of downy mildew fungal growth on the underside of leaves is a telltale sign of downy mildew and is best observed in the morning. Lesions may look similar to angular leaf spot.Yellow lesions on leaf surface that are bound by leaf veins.Pseudoperonospora cubensis (“fungal-like” organism or watermold) Identification ![]() Water-soaking and blight of immature summer squash fruit and stems. Wilting summer squash plant infected with Phytophthora.
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