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. Use foliar sprays to protect fruit, applied with an air-assist sprayer that forces product into the lower plant canopy.Drip applied fungicides are recommended for root and crown rot.
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