What causes rice 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.
What does magnaporthe Grisea do?
It is an extremely effective plant pathogen as it can reproduce both sexually and asexually to produce specialized infectious structures known as appressoria that infect aerial tissues and hyphae that can infect root tissues.
What are the symptoms of rice blast disease?
Blast symptoms appear on leaves as elliptical spots with light-colored centers and reddish edges. The most serious damage from rice blast occurs when the disease attacks the nodes just below the head, often causing the stem to break.
How do you control blast disease of rice?
Seed treatment at 2.0 g/kg seed with Captan or Carbendazim or Thiram or Tricyclazole. Systemic fungicides such as pyroquilon and tricyclazole are possible chemicals for controlling the disease. Spraying of Tricyclazole at 1g/lit of water or Edifenphos at 1 ml/lit of water or Carbendazim at 1.0 gm/lit.
How do you control the neck blast of rice?
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 in cases where the risk of yield losses is high.
How do you prevent rice blasts?
Use a protectant fungicide so that the panicles is protected as it emerges from the boots. Because rice blast is a multiple cycle disease, fungicide applications to control leaf blast early in the season are generally ineffective in reducing the incidence of neck blast and yield losses.
Which plant controls blast of rice?
Blast (Pyricularia oryzae)
| Avoid Excees Use of Nitrogen Fertilizer | Use Resistant variety BPT 5204 |
| Avoid Dry Nursery | Root Dipping of Seedlings in Pseudomonas |
| Spray Carbendazim | Spray Edifenphos |
| Thiram-Seed Treating Fungicide | Treat the Seeds with Captan |
How do you control blight sheath?
carefully control of weeds, especially on the levees. drain rice fields relatively early in the cropping season to reduce sheath blight epidemics. use fungicide to treat seeds. improve canopy architecture by reducing seeding rate or providing wider plant spacing.