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27
Jul

Why and when it occurs for Rice blast disease (Karapa)

1. Infection is most likely after long periods of rain or high humidity with little or no wind movement and relatively warm nights (63-73°F or 18-23°C).

2. These conditions favor spore germination and formation. Ensuring that the plants are flooded and avoiding drought stress are effective in controlling the fungus.

27
Jul

Prevention and Treatment for Rice blast disease ( Karapa)

1. Cultural practices to control Rice Blast include the destruction of diseased crop residue, careful use of nitrogen fertilizer (high levels increase the likelihood of disease), the use of water seeding rather than drill seeding and ensuring that plants remain flooded all seem to help control the disease. Planting of resistant varieties of rice may also be h

27
Jul

Symptoms of Rice blast disease (Karapa)

1. The disease is first seen as elliptical gray-white lesions with reddish edges on the leaves (leaf blast) and stems of the plant.

2. The lesions run parallel to the long axis of the leaf or stem.

3. Most damage occurs when the fungus spreads to the area below the seed head of the plant, causing it to break off (rotten n

27
Jul

Rice blast disease (Karapa)

1. Causing organism of Rice blast: Pyricularia oryzae.

2. Marathi name: Karapa.

3. P. oryzae is an ascomycete fungus, a member of the sac fungi.

4. One of the features of these fungi is that they generate spores, called conidia or conidiospores, that can be easily dispersed by the wind and splashing rain.

5. These spores can o

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