English name: Black Rot Scientific name: Guignardia bidwellii Type of disease: Fungal disease Family: Gnomoniaceae Symptoms Black rot affects the leaves, buds, and fruit sets of grape vines. On the leaves, they appear as

English name: Powdery Mildew Scientific name: Erysiphe necator (Uncinula necator) Type of disease: Fungal disease Family: Erysiphaceae Symptoms Powdery mildew appears as grayish-white powders on the upper surfaces of leaves, stems, and fruit sets. May become

English name: Mildew Downy Scientific name: Plasmopara viticola Type of disease: Fungal disease Family: Peronosporaceae Symptoms Downy mildew can affect all green tissues of grapes, including leaves, buds and clusters