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18
Jul

Control Measures of Rice Blast disease in Karnataka

Host plant resistance to Rice Blast disease: Planting resistant varieties is the least expense and safest method of disease control. Rice varieties like Rasi, IET 1791, BR-2655 are some of the blast resistant lines being recommended in Southern dry zone of Karnataka. Varietal mixtures can also be used to reduce slow disease spread.

Cultural Practices to control of Rice Blast disease : Almost all cultural practices used in rice production are timing of

18
Jul

Mechanism of damage of Rice Blast disease in Karnataka

 

1. Conidia are produced on lesions on the rice plant about 6 days after inoculation. The production of spores increases with increase in the relative humidity. 2. Most of the spores are produced and released during the night. After spore germination, infection follows. Infection tubes are formed from the appressoria and later the penetration through the cuticle and e
18
Jul

Symptoms of Rice Blast disease in Karnataka

Leaf blast: On leaves, elliptical or spindle-shaped lesions (0.5-1.5 x 0.3-0.5 cm), with pointed ends and grey or white centers. dark- green to reddish-brown margins, sometimes with a yellow halo.

Under humid conditions, abundant conidia are produced on both sides of the leaf. In cases of severe infection, lesions coalesce, killing the leaves.

Leaf sheath

18
Jul

Rice Blast disease of Karnataka

1. Common names in English for Rice Blast Disease : rice blast disease, rice rotten neck, rice seedling blight, blast of rice, oval leaf spot of graminea, pitting disease, ryegrass blast, johnson spot.

2.  Causal organisam - Pyricularia grisea.

3.  Parts affected by Rice Blast disease are mainly inflorescence, leaves, seeds, stems and whole pl

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