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25
Jun

Symptoms of Neck blast

Symptoms of Neck blast :

1.The neck blast also called as neck rot or rotten neck.

2.The neck rot or rotten neck blast phase is caused by infection of the neck node by the fungus Pyricularia oryzae. 

3.Rotten neck symptoms appear at the base of the panicle starting at the node.

4.The infected tissue turns dark brown to black and shrivel causing the stem to break.

File Courtesy: 
Rice Blast Disease and its Management ( Dr. Krishnaveni)
Photo Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
25
Jun

Symptoms of Node blast

Symptoms for the identification of rice blast disease:

  • When the nodes are infected, irregular black areas encircle the nodes and the nodes rot.
  • The affected nodes may break up and all the plant parts above the infected nodes may die. 

 

File Courtesy: 
Rice Blast Disease and its Management ( Dr. Krishnaveni)
Photo Courtesy: 
DRR Manual (Rice Blast Disease and its Management)
25
Jun

Symptoms of Panicle blast

 

Symptoms of Panicle blast

 

 

1. At the time of flowering, areas near the panicle base are often attacked causing ‘rotten neck’ or ‘neck rot’ symptoms. 

2. Blackening at the principal nodes below the flowering axis is known as neck infection. 

3. The neck becomes shrivelled and covered with grey mycelium. 

File Courtesy: 
Rice Blast Disease and its Management ( D . Krishnaveni)
25
Jun

Collar blast

Symptoms of Collar blast 

 

 

1. The collar rot phase occurs due to infection at the junction of the leaf blade and sheath, resulting in development of characteristics brown to dark brown lesion.

2. Severe collar rot infection on the flag or second to last leaf often kills the entire leaf. 

File Courtesy: 
Rice Blast Disease and its Management ( D . Krishnaveni)
25
Jun

Leaf blast

Leaf blast: 

 

1.The symptoms start with the appearance of small whitish, greyish or bluish spots of 1-3 mm diameter on the leaf blades.

File Courtesy: 
Rice Blast Disease and its Management ( D . Krishnaveni)
Photo Courtesy: 
Mr.Chaitanya - DRR
25
Jun

Symptoms of Rice Blast

 Symptoms  of  Rice Blast

  • The fungus affects the leaves, nodes and panicles and produces characteristic symptoms.

 

File Courtesy: 
Rice Blast Disease and its Management ( D . Krishnaveni)
Photo Courtesy: 
CRRI
25
Jun

Economic importance of Rice Blast

 

Economic importance of  Rice Blast

Economic losses due to rice blast disease:

  • The yield loss due to this disease may be as high as 75% or more in disease conducive conditions.

 

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
25
Jun

Distribution and occurrence of Rice Blast

Distribution and occurrence of rice blast disease:

1. The rice blast disease is endemic in upland areas of 

File Courtesy: 
Rice Blast Disease and its Management ( D . Krishnaveni)
25
Jun

History of Rice Blast

 

History of  Rice Blast

1. In India, the disease gained importance when a devastating epidemic occurred in Thanjavur (Tanjore) delta of Tamilnadu India during 1919. 

2. The disease has been recorded from almost all the rice growing regions of India. However, the intensity of the disease varies in different regions in different years. 

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
25
Jun

Introduction to Rice Blast ( Pyricularia grisea )


Introduction to Rice Blast ( Pyricularia grisea )

1. Rice blast is the most severe disease of rice. 

2. The disease is especially more serious in humid temperate areas, uplands and hilly areas. 

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
Photo Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
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