downy mildew fungus

Listing 1 - 10 from 96 for downy mildew fungus

Lactuca sativa Disease Descriptions - Downy Mildew
... - Downy Mildew Downy Mildew Symptoms on Lettuce Downy Mildew (fungus - Bremia lactucae): First symptoms are yellowish or light green areas on the upper surface of the leaves. As the lesions enlarge, the fungus produces downy ... fungus is rarely seed-borne and does not persist long in soil. The source of infection is infested crop residue and, occasionally, weeds. Spores of the downy mildew fungus are ...
plantpathology.tamu.edu

Downy Mildew of Grape, HYG-3013-95
... Ohio 43210-1087 Downy Mildew of Grape HYG-3013-95 Michael A. Ellis Downy mildew is a major disease of grapes throughout the eastern United States. The fungus causes ... downy mildew growth appears. Young shoots usually are stunted and become thickened and distorted. Severely infected shoots and tendrils usually die. Causal Organism Downy mildew is caused by the fungus Plasmopara viticola. The fungus ...
ohioline.osu.edu

Downy Mildew of Crucifers, HYG-3124-96
... 2021 Coffey Road, Columbus, OH 43210-1087 Downy Mildew of Crucifers HYG-3124-96 Sally A. Miller Randall C. Rowe Richard M. Riedel Downy mildew affects all cultivated plants and weeds in ... radish these symptoms may be confused with those caused by Rhizoctonia. Causal Organism The fungus causing downy mildew in crucifers, Peronospora parasitica, overwinters in roots or in decaying portions of diseased ...
ohioline.osu.edu

Cucumis and Cucurbita species Disease Description - Downy Mildew
... Cucurbita species Disease Description - Downy Mildew Downy Mildew Symptoms on Cantaloupe Downy Mildew (fungus - Pseudoperonospora cubensis): Angular yellow spots appear on the upper surface of the leaf during ... by wind from diseased plants. Cool temperatures along with free moisture are ideal for mildew infection and spread. Hot, dry weather may reduce or stop disease development. Resistant ...
plantpathology.tamu.edu

Cucumis and Cucurbita species Disease Description - Downy Mildew
... Cucumis and Cucurbita species Disease Description - Downy Mildew Fusarium Wilt Symptoms Fusarium wilt - (fungus - Fusarium oxysporum f. sp. melonis): Fungus infects roots causing damping-off of seedlings or wilting and plant death of older ...
plantpathology.tamu.edu

Sweet corn Disease Descriptions - Crazy Top Downy Mildew
... Downy Mildew Crazy Top Downy Mildew Symptoms on Sweet corn Crazy Top Downy Mildew (fungus - Sclerophthora macrospora): This disease is a problem when fields become flooded early in the life of the plant. The fungus produces ... lighter green color than normal leaves. Tassels and ears develop green, leafy shoots. The fungus is commonly found in grasses along the edge of the field. Spores are washed ...
plantpathology.tamu.edu

Sweet corn Disease Descriptions - Downy Mildew
... Sweet corn Disease Descriptions - Downy Mildew Downy Mildew Symptoms on Sweet corn Downy Mildew (fungus - Peronosclerospora sorghi): Infected plants are chlorotic, stunted and have striped leaves. Infected leaves have a downy growth on the underside, toward the basal ...
plantpathology.tamu.edu

New Disease Reports - First record of the downy mildew Peronospora myosotidis on Brunnera macrophylla in the UK
... First record of the downy mildew Peronospora myosotidis on Brunnera macrophylla in the UK Reports Search NDR About NDR Editors Author Info Submission Links First record of the downy mildew Peronospora myosotidis ... 21-24 µm). The morphology of the fungus was typical for Peronospora myosotidis (Gaumann, 1923). The only previous record of a downy mildew on B. macrophylla is Peronospora anchusae on ...
www.bspp.org.uk

Downy Mildew of Cucurbits
... Downy Mildew of Cucurbits Author: Mary Ann Hansen, Extension Plant Pathologist, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech. Publication Number: 450-707, Posted December 2000 Downy mildew, caused by the fungus ... along the Atlantic seaboard and other sub-tropical areas where the fungus overwinters. Downy mildew spreads rapidly in moist weather and is destructive over a ...
www.ext.vt.edu

Marin Rose Society - Downy Mildew
... , and most importantly, how to control it. Downy mildew is caused by the fungus Peronospora sparsa. Contrary to its name, it really doesn’t look “downy” on roses. Symptoms on leaves vary from yellow ... sign of the disease is obvious. The fungus is active only under cool, damp conditions, and in our area is usually a springtime problem. Downy mildew spores begin active growth when they are ...
www.marinrose.org