blast disease of rice pdf

1. What causes rice blast?
2. How do you control rice blast disease?
3. What are the diseases of rice?
4. What are the stages of rice blast?
5. What do you understand by blast of rice?
6. What is Khaira disease of rice?
7. Which crop is affected by the disease called blast?
8. What is bacterial blight of rice?
9. How do you get rid of rice bugs?
10. Which pathogen is most associated with rice?
11. How do pests affect rice production?
12. What is Blast in agriculture?
13. What is blast disease in plants?
14. What is neck blast?
15. What is the Blast program?
16. What is the chemical control of potato blight?
17. Who discovered Khaira disease of rice?
18. WHO reported Khaira disease first time?
19. Which state of India is the highest producer of rice?

What causes rice blast?

Pathogen Biology. The fungus that causes rice blast is called Magnaporthe oryzae (formerly Magnaporthe grisea) (Figure 9). It is an ascomycete because it produces sexual spores (ascospores) in structures called asci, and is classified in the newly erected family Magnaporthaceae.

How do you control rice blast disease?

Systemic fungicides like triazoles and strobilurins can be used judiciously for control to control blast. A fungicide application at heading can be effective in controlling the disease.

What are the diseases of rice?

The two major fungal diseases of rice in Nigeria are rice blast (Pyricu/ar;a oryzae Cav.) and brown spot (Cochliobolus miyabeanus (It0 and Kuribayashi) Oreschler ex Dastur). The loss in grain yield attributable to these diseases ranges from 11.5-39.6% and 12-43% respectively.

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 is Khaira disease of rice?

Khaira disease of rice is caused due to deficiency of(1) Boron deficiency(2) Zinc deficiency(3) Magnesium deficiency(4) All of the above. The deficiency of zinc in rice causes khaira disease. They existed as smaller patches in the nursery or might be observed in the main-land of rice. The leaves are discoloured.

Which crop is affected by the disease called blast?

Rice is one of the most important crop plants in the world, and the rice blast disease caused by the fungus Magnaporthe grisea is one of the most destructive diseases. The disease is widespread and causes severe losses.

What is bacterial blight of rice?

Bacterial blight is caused by Xanthomonas oryzae pv. oryzae. It causes wilting of seedlings and yellowing and drying of leaves.

How do you get rid of rice bugs?

If you have rice weevils in your rice, powder, or grains, the safest method is to bake the dry goods to kill and get rid of all the pests. You can either heat or freeze the grains- both methods work well to purify infested grains or to kill any larvae or bugs in newly purchased grains.

Which pathogen is most associated with rice?

Bacillus cereus food poisoning is associated with cooked rice.

How do pests affect rice production?

Many grain pests preferentially eat out grain embryos, thereby reducing the protein content of feed grain and lowering the percentage of seeds which germinate. Some important stored grain pests include the lesser grain borer, rice weevil and rust red flour beetle.

What is Blast in agriculture?

“Rice blast is a common but important fungal disease of rice. The disease is caused by the fungus, pyricularia oryzae, which attacks the rice crop at all stages. The symptoms can be seen on leaves, nodes, neck of panicle, and on grains,” said S. M. Uduman Mohideen, Joint Director of Agriculture, in an advisory.

What is blast disease in plants?

Blast disease, also known as rice rotten neck, is caused by the fungus Pyricularia oryzae and is the most damaging of all the fungal diseases in Southern Africa. ... The fungus survives well in rice straw, weeds, reeds, rushes, and millet-like cereals, forming spores and infecting rice plants when they are sown.

What is neck blast?

Blast is caused by the fungus Magnaporthe oryzae. It can affect all above ground parts of a rice plant: leaf, collar, node, neck, parts of panicle, and sometimes leaf sheath. ... When a node or neck blast infection is present, it can cause plants to develop few or no grains at all.

What is the Blast program?

Summary. The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between protein or nucleotide sequences. The program compares nucleotide or protein sequences to sequence in a database and calculates the statistical significance of the matches.

What is the chemical control of potato blight?

The severe late blight can be effectively managed with prophylactic spray of mancozeb at 0.25% followed by cymoxanil+mancozeb or dimethomorph+mancozeb at 0.3% at the onset of disease and one more spray of mancozeb at 0.25% seven days after application of systemic fungicides in West Bengal [50].

Who discovered Khaira disease of rice?

Dr. Y.L. Nene discovered the control over the 'Khaira disease' of rice.

WHO reported Khaira disease first time?

During his 14-year tenure at Pantnagar, Nene's work on “Khaira Disease of Paddy” was recognized internationally because the cause of disease was established to be zinc deficiency in field rice, which was the first such report in the world.

Which state of India is the highest producer of rice?

Production(000 Tonnes)