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Diseases

Diseases
2
Aug

False smut

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishnaveni (DRR)
2
Aug

Sheath rot

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishnaveni (DRR)
2
Aug

Udbatta disease

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
CRRI
2
Aug

Sheath blight

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishnaveni (DRR)
2
Aug

Leaf scald

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
http://www.knowledgebank-brri.org/rice_disease.php
2
Aug

Rice brown spot

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishnaveni (DRR)
2
Aug

Rice blast

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishna Veni (DRR)
2
Aug

Bunt or Kernel Smut (Neovossia horrida)

1. Only a few grains in the panicle are infected. Frequently, only a part of the grain is replaced by a black powder.

2. Sometimes, entire grain is also attacked and the black powder scatters on to other grains or leaves, and this is often the easiest way to detect the disease in the field.

3. The disease incidence is more on short duration varieties, planted early. Also avoid heavy doses of nitrogenous fertilizers.

4. Two sprays of Tilt 25 EC @ 200 ml in 200 litres of water/acre at 10% flowering stage and 10 days after should be given for controlling the disease.

File Courtesy: 
Punjab Agricultural University, Ludhiana
2
Aug

False smut (Ustilaginoidea virens)

 

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
2
Aug

Stem rot (Sclerotium oryzae)

 

1. The fungus affects the stem at earing and black lesions are produced on the sheath at water level.

2. Later on, the stem gets infected and rots leading to withering and lodging of the plant.

3. The incidence of this disease has declined on high yielding varieties due to improved cultural practices. Prefer to grow tolerant varieties of the Basmati group in the infested fields.

File Courtesy: 
Punjab Agricultural University, Ludhiana
2
Aug

Sheath rot (Sarocladium oryzae)

 

1. The rot occurs on the uppermost leaf-sheaths where oblong to irregular and grey-brown to light-brown lesions develop.

2. The lessons often coalesce to cover the entire sheath. In severe cases, young panicles either do not emerge or emerge partially.

3. A white- powdery growth of the fungus appears on the panicle inside the sheath. The glumes of infected florets are discoloured, dark-red or purple brown to black and often do not fill.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
2
Aug

Sheath blight (Corticium sasakii)

 

1. Greyish green lesions with purple margin develop on the leaf-sheath above the water level. Later, the lesions enlarge and coalesce with other lesions.

2. The symptoms are usually not distinct till flowering. Its severe attack results in the poor filling of the grains.

3. Burn the rice straw and stubbles after harvesting the affected crop. Avoid the excessive use of nitrogenous fertilizers. Keep the bunds clean by removing the grass.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
2
Aug

Brown leaf spot (Drechslera oryzae)

 

1. It produces oval, eye-shaped spots with a conspicuous dark-brown spot in the centre and light brown margin.

2. The support is surrounded by yellow halo. Spots are also produced in the grains. This disease occurs in poor soils, therefore, give adequate and nutrition to the crop.

3. To control the disease, give two sprays of Tilt 25 EC (propiconazole) @ 200ml or Indofil Z-78 (zineb) @500g in 200 litres of water/acre.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
2
Aug

Blast (Pyricularia grisea)

 

1. The fungus causes spindle shaped spots with grayish centre and brown margin on the leaves at maximum tillering.

2. It also causes brown lesions on the neck of the panicle showing neck rot symptoms and the panicles fall over.

3. The disease is more severe on Basmati particularly in the submontaneous areas and under application of heavy nitrogenous fertilizers.

File Courtesy: 
Punjab Agricultural University, Ludhiana
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
1
Aug

Leaf scald

Symptoms:

1. The disease is caused by Rhynchosporium oryzae;

2. Leaves get blighted with dark and light brown zonations.

3. The symptoms may start from tip or margin of the leaf.

Management of disease

1. One or two sprays of 0.1% carbendazim 50 WP at Panicle Initiation reduce the disease severity

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
Photo Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
1
Aug

Brown Spot disease

Symptoms:

The disease is caused by Helminthosporium oryzae. It produces oval dark brown spots on leaves and plumes.
The disease occurs mostly in deficient and P90r soils and when severe, causes heavy damage both in nursery and in the field.
Management of brown spot:

Correction of soil deficiency and application of balanced nutrition reduces the disease

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
Photo Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
1
Aug

Management of blast disease

A) Chemical control
1. Seeds should be soaked for 12 hrs in 0.1 % Carbendazim 50 WP (Bavistin, Derosol or JKstein) prior to sowing of nursery or broadcasting for upland rice.
2. Root dip treatment to the seedlings immediately after uprooting is recommended for 12 hrs in 0.1 % Carbendazim 50 WP (Bavistin, Derosol or JKstein) in low land crop.

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
1
Aug

Symptoms of blast disease

1. Typical leaf lesions are spindle shaped, usually with reddish yellow margin; grey in the centre.
2. Leaves of susceptible varieties may be killed. The fungus may also attack the stems at nodes which turn dark brown to blackish in colour and tend to break easily.
3. Lesions may also occur on panicle neck. The infected necks turn blackish and break over. Neck blast results in few or no seeds in the panicle.

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
Photo Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
1
Aug

Blast disease

1. Causal organism -Magnaportha grisea is endemic in north eastern states.
2. This disease affects the crop at all the growth stages viz., nursery, tillering and flowering.
3. The yield loss ranges from 36 -50% depending upon the variety and environmental conditions

File Courtesy: 
Rice Research Station, Kaul (Kaithal), Haryana
31
Jul

Bacterial leaf streak (Xanthomonas oryzae pv. oryzicola)

1. Small translucent streaks appear in the interveinal areas of the leaf.
2. The streaks gradually enlarge and turn reddish, when the plants near maturity.

File Courtesy: 
Punjab Agricultural University, Ludhiana
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