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27
Jul

Damage symptoms of Sheath Blight disease (Parnkarpa)

1. Appearance of one or more relatively large, oblong or irregularly elongated lesions on the leaf sheath; in advanced stages center of the lesion becomes bleached with an irregular purple brown border.

2. Initially these lesions are white in colour later it turns to dark brown.

3. At severe condition drying of leaves.

27
Jul

Control of Sheath Blight disease (Parnkarpa)

Cultural Practices to control Sheath Blight disease:

• Avoid using infected seed.

• Apply moderate 'N' levels (80-100 kg/ha) in 3-4 splits.

• Avoid excess 'N', skip final 'N' in sheath blight infected fields.

• Destroy stubbles / weeds, etc.

• Check brown plant hopper population.

Chemical control for Sheath Blight disease:

• Spraying fungicides of 1g carbendazim 50WP (540g/acre) or 2.0g m

27
Jul

Details of Sheath Blight disease ( Parnkarpa)

1. Period of occurrence: Tillering to milk stage.

2. Extent of yield loss: On an average, 20 to 50% annual yield loss Alternate hosts: Among the plants recorded as hosts are, sugarcane, bean, soybean, tomato, egg plant, tobacco, water hyacinth , hyacinth bean and green gram.

27
Jul

Sheath Blight disease ( Parnkarpa)

1. Causal organism of Sheath blight: Rhizoctonia solani Kuhn.

2. Marathi name: Parnkarpa

3. Sheath blight is a fungal disease, more common in rainy season than in dry season in the topics.

4. This disease is problematic in areas where irrigation facilities are abundant.

5. Due to blighting of the leaf sheaths, it is common

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