Initial symptoms of mottle streak disease appear around 45 days after sowing in funnel leaves as small sparse chlorotic specks.
The virus affected plants are stunted and pale green in colour.
Later the specks coalesce leading to short streaks.
Yellowing of plants in severe infection.
Infected plants produce more of nodal branches and unproductive tillers.
Failure of earhead emergence with sparse grains is noticed during initial and late infection.
Vector for this disease is leafhopper, Cicadulina
Identification of pathogen:
Nucleo rhabdovirus or Potato Yellow Dwarf Virus is bacilliform, with one type of particle of about 380 x 75 nm. It is enveloped with a clear modal length of 178-224nm, 59-76 nm wide. Axial canal obvious; 8 nm in diameter
Rogue out the affected plants
Spray systemic insecticides Methyl dematon 500ml/ha. When noticing symptom and repeat twice if necessary at 20 days interval to control the vector