Symptoms appear as dark brown to black leathery tissue on plant parts, but commonly the lower halves of young shoots, stems or the bases of blighted leaves. Shoots may wilt and collapse. Severe infection may affect the entire crown. If you cut into the stem, vascular tissues show brown, olive green, reddish or dark streaking. Phytophthora is a 'water mold' and it is favored by frequent irrigation and wet, slow draining soils. Saturated soils encourage spore production, causing more severe disease.
Phytophthora is favored by cool, wet conditions and remains in the soil for years. Once it appears in a growing area, rotate out of the susceptible crop or take other cultural measures to reduce future losses. Phytophthora is strongly influenced by drainage, so consider constructing raised beds or incorporating amendments to improve soil drainage. This disease is spread by rainsplash or contaminated tools, soil, or plant material. Remove and destroy all infected materials.
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