Howard F. Schwartz, Colorado State University, Bugwood.org
downy mildew symptoms on lower surface of infected leaf, caused by Plasmopora halstedii
Ferenc Viranyi, Godollo University of Agricultural Sciences, Bugwood.org
Sunflower severely affected by downy mildew (Plasmopara halstedii) in the field, showing retarded growth, leaf chlorosis and horizontal head.
Ferenc Viranyi, Godollo University of Agricultural Sciences, Bugwood.org
Young sunflower plants affected by downy mildew (Plasmopara halstedii) in the field, with fungal sporulation on the lower leaf surface.
Ferenc Viranyi, Godollo University of Agricultural Sciences, Bugwood.org
A sporangiophore with sporangia arising from a cotyledon of sunflower systemically infected with Plasmopara halstedii.
SRPV, Ile de France , Les Services Régionaux de la Protection des Végétaux, Bugwood.org
Green and chlorotic mottling along the main veins due to Plasmopara halstedii on sunflower.
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
downy mildew (Plasmopara halstedii) sign
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
downy mildew (Plasmopara halstedii) sign
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
downy mildew (Plasmopara halstedii) sign
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
downy mildew (Plasmopara halstedii) sign
Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
downy mildew (Plasmopara halstedii) sign
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Portions of infected leaves will become necrotic.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Portions of infected leaves will become necrotic.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
Bruce Watt, University of Maine, Bugwood.org
Sporulation on leaf surface
Bruce Watt, University of Maine, Bugwood.org
Sporulation on leaf surface
Bruce Watt, University of Maine, Bugwood.org
Symptomatic infected leaf
Howard F. Schwartz, Colorado State University, Bugwood.org
downy mildew symptoms on lower surface of infected leaf, caused by Plasmopora halstedii
Howard F. Schwartz, Colorado State University, Bugwood.org
downy mildew symptoms on upper and lower surfaces of infected leaves, caused by Plasmopora halstedii
Karen Snover-Clift, Cornell University, Bugwood.org
Sample taken from Harford, NY.
downy mildew symptoms on lower surface of infected leaf, caused by Plasmopora halstedii
Sunflower severely affected by downy mildew (Plasmopara halstedii) in the field, showing retarded growth, leaf chlorosis and horizontal head.
Young sunflower plants affected by downy mildew (Plasmopara halstedii) in the field, with fungal sporulation on the lower leaf surface.
A sporangiophore with sporangia arising from a cotyledon of sunflower systemically infected with Plasmopara halstedii.
Green and chlorotic mottling along the main veins due to Plasmopara halstedii on sunflower.
downy mildew (Plasmopara halstedii) sign
downy mildew (Plasmopara halstedii) sign
downy mildew (Plasmopara halstedii) sign
downy mildew (Plasmopara halstedii) sign
downy mildew (Plasmopara halstedii) sign
white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
Portions of infected leaves will become necrotic.
Portions of infected leaves will become necrotic.
white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
Sporulation on leaf surface
Sporulation on leaf surface
Symptomatic infected leaf
downy mildew symptoms on lower surface of infected leaf, caused by Plasmopora halstedii
downy mildew symptoms on upper and lower surfaces of infected leaves, caused by Plasmopora halstedii
Sample taken from Harford, NY.