sweet potato feathery mottle virus (SPFMV)

Symptoms

Faint pale or chlorotic spots, irregular feathery patterns along the veins and purple-ringed chlorotic spots appear on the leaves; symptoms are often mild on their own but become severe when the plant also carries a second virus, stunting growth and cracking or distorting the storage roots. Many infected plants look almost normal, which is how the virus spreads unnoticed.