Mottle Streak: Nucleorhabdovirus
Symptom:
- 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
Management:
- 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
