CorseMachin
In the first stage, leaf blast, symptoms may appear as oval to diamond shaped lesions on the leaf shoots. Lesions are white to gray in the center with brown to black margins. Leaf blast can kill tender young plants. The second phase, collar blast, produces brown to black rotted looking collars.
- How do you know if its a rice blast?
- What are the stages of rice blast?
- What do you understand by blast of rice?
- What are the effects of rice blast?
- When does rice blast occur?
- How does rice blast spread?
- How do you prevent rice blasts?
- How do you control rice disease?
- When do you apply fungicide to Rice?
- What is Favourable condition of rice blast organism?
- Which crop is affected by the disease called blast?
- What is disease triangle?
How do you know if its a rice blast?
How to identify
- Initial symptoms appear as white to gray-green lesions or spots, with dark green borders.
- Older lesions on the leaves are elliptical or spindle-shaped and whitish to gray centers with red to brownish or necrotic border.
What are the stages of rice blast?
From the seedling stage through plant maturity, rice blast progresses through several phases starting with leaf blast, followed by collar, panicle and node blast.
What do you understand by blast of rice?
a disease of rice caused by the fungus Pyricularia oryae, characterized by elliptical leaf spots with reddish-brown margins, brownish lesions and neck rot of the fruiting panicles, and stunting of the plant.
What are the effects of rice blast?
Rice blast (Magnaporthe oryzae) is a key concern in combating global food insecurity given the disease is responsible for approximately 30% of rice production losses globally—the equivalent of feeding 60 million people. These losses increase the global rice price and reduce consumer welfare and food security.
When does rice blast occur?
Comments on the Disease
Rice blast was first identified on California rice in 1996. The disease is favored by long periods of free moisture, high humidity, little or no wind at night, and night temperatures between 63 and 73°F. Leaf wetness from dew or other sources is required for infection.
How does rice blast spread?
They found that rice blast fungus forms a special infection structure that applies mechanical force to rupture the rice leaf cuticle and the protective, waxy layer covering the leaf. Once inside the host, the fungus can live off the rice plant's nutrients to spread the infection.
How do you prevent rice blasts?
The best practices for preventing rice blast is to keep rice fields flooded deeply with a continual flow of water. When rice fields are drained for various cultural practices, a higher incident of fungal disease results. Rice blast treatment is done by applying fungicides at precise times of the plant's development.
How do you control rice disease?
The four most important strategies for rice disease management are to rotate crops, plant resistant varieties, plant in warm soil and use fungicides when necessary.
...
To minimize this disease:
- Plant clean seed.
- Treat seed with a fungicide.
- Avoid late planting.
- Apply Tilt at boot.
- Apply recommended rates of nitrogen.
When do you apply fungicide to Rice?
Later-planted rice and higher nitrogen fertilizer rates favor the development of the disease. The best way to control kernel smut is with a propiconazole fungicide application when the rice has a 2- to 4-inch panicle around the mid-boot stage of development.
What is Favourable condition of rice blast organism?
Conditions conducive for rice blast include long periods of free moisture and/or high humidity, because leaf wetness is required for infection. Sporulation increases with high relative humidity and at 77–82 °F (25–28 °C), spore germination, lesion formation, and sporulation are at optimum levels.
Which crop is affected by the disease called blast?
Rice blast caused by fungus Magnaporthe oryzae, is generally considered the most important disease of rice worldwide because of its extensive distribution and destructiveness under favourable conditions.
What is disease triangle?
The disease triangle is a conceptual model that shows the interactions between the environment, the host and an infectious (or abiotic) agent. This model can be used to predict epidemiological outcomes in plant health and public health, both in local and global communities.
Yet No Comments