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一、在叶上发生 1.生斑点 (1)在叶尖及叶绿生暗褐色不规则形的病斑,叶背生霜状白霉______晚疫病Phytophthora infestans DE BARY
First, the occurrence of a leaf 1. Health spots (1) in the tip and leaf green dark brown irregular shaped spots, leaf back cream frosty mildew ______ Late blight Phytophthora infestans DE BARY