Common Scab
Pathogen: Streptomyces scabies
Symptoms
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Superficial wounds--brownish, 5-8mm in diameter--on the tuber.
The blemishes can appear on the surface, raising the peel
by 1-2mm (russet scab) or causing slight depressions. No symptoms
are visible on the foliage.
Damage
Severe damage to the quality of tubers. Infestation of soil
and propagating material.
Conditions for Development
Dry soil, pH basic to neutral, and temperatures conducive
to infestation (20-22°C).
Control
Varieties: Differing degrees of susceptibility to the disease.
Pesticides: Disinfection of the tubers and the soil.
Management: Use of disease-free seed tubers, crop rotation,
and optimal irrigation, while maintaining field capacity suitable
for potato cultivation.
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
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