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Details of Sheath rot disease

Period of occurrence of Sheath rot disease: The disease is important during the heading towards the maturity stages of the rice crop. It usually attacks the uppermost leaf sheath that encloses the panicles and causes rotting of the panicles.

Conditions favourable for Sheath rot disease: High amount of nitrogen, high relative humidit


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


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.


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.

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


Control Measures for Rice Leaf Scald disease

Cultural practices to control Leaf Scald:

• Use disease free seeds for sowing.

• Do not use high nitrogenous fertilizer.

Chemical control measures for Leaf Scald :

If the disease observed in the field then spray 0.1% Carbendazim solution or 2g mancozeb or 2.25g Zineb in 1liter of water


Damage Symptoms of Leaf Scald disease

1. Lesions of alternating light tan and dark brown starting from leaf tips or edges.

2. Lesions oblong with light brown halos in mature leaves.

3. Individual lesions 1-5 cm long and 0.5-1 cm wide or may almost cover the entire leaf.

4. Continuous enlargement and coalescing of lesions result in blighting of a large part of the l


Leaf Scald disease

1. Causal Organism: Monographella albescens.

2. Period of occurrence: The disease is important during the tillering and stem elongation stages of the crop.

3. Extent of yield loss: In India 20-30% yield losses were reported due to this disease.

4. Alternate hosts: The hosts of the fungus include Echinochloa crus-galli (L.) P. Beauv. (cockspur) and Oryza


Control Measures for Rice Brown leaf spot

Cultural practices to control Brown leaf spot:

1. Use disease free seeds for sowing.

2. Do not use high nitrogenous fertilizer.

3. Use resistant variety Amruth.

Chemical control of Brown leaf spot:

4. If the disease observed in the field than spray 2g mancozeb or 2.25g Zineb in 1liter of water.


Damage symptoms of Brown leaf spot

1. The symptoms of the disease appear on the coleoptile, the leaves, leaf sheath and also the glumes.

2. On the leaves the spots vary in size (1cm) and shape from minute dots to circular, eye shaped or oval spots is seen in the central portion.

3. The seeds are some times shriveled and discolored.

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