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Leaf Scald

4
Aug

Leaf scald

2
Aug

Leaf scald

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
http://www.knowledgebank-brri.org/rice_disease.php
1
Aug

Leaf scald

Symptoms:

1. The disease is caused by Rhynchosporium oryzae;

2. Leaves get blighted with dark and light brown zonations.

3. The symptoms may start from tip or margin of the leaf.

Management of disease

1. One or two sprays of 0.1% carbendazim 50 WP at Panicle Initiation reduce the disease severity

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
Photo Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
27
Jul

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

File Courtesy: 
RARS, Karjat
27
Jul

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 leaf blade.

5. The affected areas dry out giving the leaf a scalded appearance.

File Courtesy: 
RARS, Karjat
Photo Courtesy: 
RARS, Karjat
27
Jul

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 sativa L. (rice).

5. Mode of transmission/ dissemination.

File Courtesy: 
RARS, Karjat
Photo Courtesy: 
RARS, Karjat
18
Jul

Control Measures of Rice Leaf scald disease

1. Chemicals such as Benomyl, Carbendazim, Quitozene, and Thiophanate-methyl can be used to treat the seeds to eliminate the disease.

2. In the field, spraying of Benomyl, Fentin Acetate, Edifenphos, and Validamycin significantly reduce the incidence of leaf scald.

3. Foliar application of Captafol, Mancozeb, and Copper Oxychloride also reduces the incidence and severity of the fungal disease.

File Courtesy: 
ZARS, Mandya
18
Jul

Symptoms of Rice Leaf scald Disease

1. The symptoms associated with leaf scald vary according to plant age and stage of growth, cultivar and plant density. Newly developed lesions on the tips or edges of leaf lamina, are approximately 1-2 cm² in area with a grey-green, water-soaked appearance.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
CRRI
18
Jul

Rice Leaf scald Disease

1. Common names of Leaf Scald : leaf scald, leaf tip blight, leaf tip dying, brown leaf blight, leaf sheath browning, brown leaf spot, leaf blight.

2. Causal Organism of Leaf Scald: Monographella albescens.

3. The leaf scald disease has been reported worldwide in rice-growing regions and seeds prove as the most important inoculum source.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
ZARS, Mandya
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