Rice Blast Biology and Reaction of Host to the Disease

• Authors: Zelalem Zewdu
• Languages of publication: EN

Abstracts

EN

Rice blast (Magnaporthe grisea) is first reported in China and then in Africa in1922. The disease is now the most widespread and devastating rice disease in all rice producing areas of the world. The disease can cause from mild yield reduction to total crop loss as depends on the variety and severity level. The rice blast isolate is closely related to the isolate of other blast like fungus and distinctly described as Magnaporthe grisea. Rice blast fungus starts the infection cycle after a three-celled conidium lands on the rice leaf surface. Thousands of spores can be produced from a single lesion within 15 days after infection. Symptoms on leaves start as small brown necrotic lesions that evolve to larger elliptical or spindle-shaped lesions, colored whitish to gray with darker borders while infected seeds display brown spots, which may result from the infection of the florets as they matured into seeds. The rice blast needs at least a 12-hour period of moderate temperatures (25 to 30 °C), high relative humidity (90-92 %), and high moisture which are conducive for its development. The disease can be managed by using resistant varieties, using integrated disease management options and nutrient managements like application of recommended nitrogen fertilizers and application of silicon fertilizers. The rice plant responds differently for reducing the occurrence and damage of the disease either fungus is incapable causing sporulating lesions on the plant or the plant develop residual resistance that remains when complete resistance has been overcome by the pathogen.

Keywords

EN

Blast; Host Reaction; Magnaporthe grisea; Magnaporthe oryzae; Rice

Discipline

• AGRICULTURE: AGRICULTURE

• Publisher: Scientific Publishing House „DARWIN”
• Journal: World News of Natural Sciences
• Year: 2021
• Volume: 39
• Pages: 11-21

Contributors

author

Zelalem Zewdu

• Ethiopian Institute of Agricultural Research, Fogera National Rice Research and Training Center, P.O.Box 1937, Bahir Dar, Ethiopia

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• Document Type: article