grappe downy mildew

agricultural agriculture agronomy algeria alimentation brown caused center cercle conidia conidium danger dangerous death disease diseased downy farm feed food fungi fungus garden grappe green health healthy horticultural horticulture infected infection jijel leaf legume loss losses mildew mycelia mycelium natural nature necrose necrosis nutrition nutrituous oomycete pathogen pathology phytopathogen phytopathology plant plasmopara protection safe safety sporange spore spot symptoms toxine vegetable viticola white zoospore