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27
Jul

Sheath rot disease

1. Causal organism: Sarocladium oryzae (Sawada) W. Gams & D. Hawksw.

2. The pathogen generally attacks the upper most leaf sheath enclosing the young panicles.

3. Oblong or irregular spots with chocolate brown colour develop on the boot leaf sheath. Sheath rots disease of rice, caused by Sarocladium oryzae.

4. It inflicts damage to the uppermost flagleaf

27
Jul

Damage symptoms of False Smut disease

1. In one panicle, only few seeds showing the disease symptoms.

2. Individual grains of the panicle are transformed into yellow or greenish velvety spore balls.

3. The spore balls are covered by a membrane in the early stages, which bursts on further growth and the loose velvety pseudomorphs become visible.

27
Jul

Conditions favourable for False Smut disease

1. Low temperature (20°C). 2. High relative humidity (>92%). 3. Moderate rainfall with intermittent clear and drizzling weather during flowering. 4. More prevalent in seasons favorable for good growth and high yields. 5. Host pants: Grasses and Wild rice.
27
Jul

False Smut Disease

Causal organism: Ustilaginoidea virens (Cke.)

Local name:

False smut is a fungal disease and is more severe in the years of high rainfall.

The farmers consider its incidence as an omen of Good Harvest.

Period of occurrence : Panicle emergence .

Extent of yield loss : Negligible, Udupi district 23% and DWR 3%.

• 1000 grai

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