Potato Mop-Top Virus
Potato Mop-Top V irus (PMTV) occurs in areas with cool, damp conditions that favour spread of its fungus vector, Spongospora subterranea.
Symptoms of potatoes disease caused by Potato Mop-Top V irus Primary symptoms develop on and in tubers of some potatoes cultivars when they are infected directly from the soil.
Usually, only some stems on a plant are infected so that an affected plant also has normal-looking stems.
The virus survives in soil and spreads to new areas mainly through resting spores of the fungus vector, carried in soil or on seed tubers.
Management treatment of infected soil with calomel, sulfur, or zinc oxide can inhibit infection of a healthy potatoes crop. Roguing is useful with potatoes cultivars that produce strong symptoms.
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