virus de la mosaïque jaune de l'orge

OBS: Le vecteur est un champignon du sol (Polymyxa graminis) capable de se développer sur les racines des céréales et de nombreuses autres graminées, et qui transmet le VMJO en automne.

OBS: Natural host range and symptoms. Symptoms vary seasonally. Symptoms yellow streaks especially on youngest leaves in winter or spring. Hordeum vulgare - yellow streaking, especially of younger leaves and sometimes of leaf sheath, also brown necrotic patches. Leaves may roll so the plants appear ""spiky"". Vigour reduced.
OBS: Transmitted by a vector; a fungus; Polymyxa graminis; Plasmodiophorales. Virus transmitted by mechanical inoculation; not transmitted by contact between plants; not transmitted by seed; not transmitted by pollen.