Family: Potyviridae
Genus: Bymovirus
Acronym: BaYMV
BaYMV Synonyms:
Barley yellow mosaic virus is one of two agents (the other is barley mild mosaic virus) that causes yellow mosaic disease of barley. The disease is soil-borne because the viruses are transmitted by the plasmodiophorid fungus Polymyxa graminis which has resting spores that survive in soil. The viruses occur, either separately or together, in autumn-sown barley and cause similar symptoms.
In the field, yellow patches appear in winter or early spring. Leaves of infected plants have elongated,... more info
Family: Potyviridae
Genus: Bymovirus
Acronym: BaYMV
BaYMV Synonyms:
Barley yellow mosaic virus is one of two agents (the other is barley mild mosaic virus) that causes yellow mosaic disease of barley. The disease is soil-borne because the viruses are transmitted by the plasmodiophorid fungus Polymyxa graminis which has resting spores that survive in soil. The viruses occur, either separately or together, in autumn-sown barley and cause similar symptoms.
In the field, yellow patches appear in winter or early spring. Leaves of infected plants have elongated, pale green or yellow flecks, typically on the youngest (unfurling) leaves and infected leaves may be curled, giving the plants a spiky appearance.
Sometimes the leaves show complete yellowing with necrotic patches and the plants are stunted. Affected plants have fewer tillers, yield less grain and grain size may be irregular. The severity of symptoms depends on the cultivar of barley and the environmental conditions but symptoms become less obvious as the stem elongates towards flowering and upper leaves are often free of symptoms. Patches may remain visible as areas of stunted growth even when symptoms have apparently disappeared but plants sometimes appear to recover from infection.
