PLRV, Potato Leafroll Virus

Pathogen: Potato Leafroll Virus (PLRV)

Symptoms

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Primary symptoms: inward curling of the upper leaves, accompanied by faded color. The curling effect sometimes extends to the lower leaves as well.

Secondary symptoms: plant stunting, stiffening of the leaves (characterized by a rustling sound) and a loss of color intensity. Affected tubers sometimes exhibit necrotic lesions that can spread during storage.

Damage

Yield reduction. Affected tubers are unusable for propagation.

Conditions for Development

The virus is transmitted by affected tubers, and is dispersed by aphids from infested plants (potato and other solanaceae spp., including wild plants). Inoculation is efficient, and is particularly harmful during the plant's early development.

Control

Varieties: Few varieties are resistant to PLRV.

Pesticides: Control of aphids via spraying, soil treatment with systemic chemicals, and high-pressure spraying of oils.

Management: Use of disease-free seed tubers, and burning infested plants.

Aerial Stem Rot
Black Dot, Colletotrichum coccodes
Blackleg and Tuber Soft Rot
Black Scurf, Rhizoctonia Canker
Common Scab, Streptomyces scabies
Early Blight, Alternaria solani
Deep Pitted Scab, Streptomyces spp
Leak, Pythium ultimum
PLRV, Potato Leafroll Virus
Powdery Scab, Spongospora subterranea
PVX, Potato Virus X
PVY, Potato Virus Y
Verticillium Wilt, Verticillium dahliae