Plant Disease Management Handbook

Cause An aphid-transmitted virus, potato virus Y, when combined with potato virus X.

Symptoms Little mottling is present, but leaves are decidedly wrinkled and curled. Individual necrotic spots start and progress until the leaf dies. Lower leaves die first; sometimes leaving a stem with a tuft of wrinkled leaves at the tip.

Cultural control

Image related to Potato (Solanum tuberosum)-Potato Rugose Mosaic

Note the necrotic areas on the leaflet midrib.

Photo part of OSU Extension Plant Pathology Slide

Shepody' with PVY and PVX.

Photo by Phil Hamm.

Potato plant showing yellow mottling.

Ken Frost, OSU, 2020.

Potato plant exhibiting yellow leaf spots as well as small necrotic spots due to potato rugose mosaic.

Photo by Ken Frost, OSU, 2020.

By K. Frost and C. M. Ocamb

See:

Potato (Solanum tuberosum) - Powdery Scab

By P. B. Hamm and C. M. Ocamb

Image related to Potato (Solanum tuberosum)-Potato Leafroll Virus (Leaf Roll)

Note the plant at the top of the picture with bronzed, rolled leaves.

Photo part of OSU Extension Plant Pathology Slide

Leaves curl up around the midrib and may assume a leathery texture.

Melodie Putnam, 2000.

By P. B. Hamm and C. M. Ocamb

Cause Phytophthora erythroseptica, a soilborne fungus-like organism. The disease is directly associated with high soil moisture. It becomes a problem in storage by encouraging the development and spread of soft rot. Pink rot does not spread in storage by spore movement but grows from tuber to tuber.

Image related to Potato (Solanum tuberosum)-Pink Rot

Note the dark line at the advancing edge of the rotted tissue.

Photo by Phil Hamm.

After affected tubers are cut, the infected tissues change to pink, brown, and black shortly after being exposed to air.

Photo by Phil Hamm.

By R. E. Ingham and C. M. Ocamb

See:

Potato (Solanum tuberosum) - Corky Ringspot

By R. E. Ingham, P. B. Hamm, and C. M. Ocamb

See:

Potato (Solanum tuberosum) - Verticillium Wilt (Potato Early Dying)

By R. E. Ingham, P. B. Hamm, and C. M. Ocamb

Image related to Potato (Solanum tuberosum)-Nematode, Root-knot

Note the bumps on the exterior of this tuber.

Photo part of OSU Extension Plant Pathology Slide

Notice the brown spots within the infected tuber.

Photo from OSU Extension Plant Pathology Slide Col

Symtoms of Meloidogyne chitwoodi before and after peeling.

Kathy Merrifield, 2000.

Cause Ditylenchus destructor is known only from a small area in Idaho. The main problem is in storage where infected tubers rot, which spreads the disease to other tubers.

Cause Globodera pallida (pale cyst nematode or white cyst nematode) was confirmed during 2006 in Idaho and Golden potato cyst nematode (G. rostochiensis) was found in British Columbia in 1965. A different species (Globodera ellingtonae) was detected on the OSU Powell Butte experiment station, where it has been contained; it has not been found elsewhere in Oregon. Quarantine of areas affected was enacted.

By K. Frost and C. M. Ocamb

Image related to Potato (Solanum tuberosum)-Leak

This tuber is severely decayed.

Photo by Kathy Merrifield, 1987.