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Diseases

Diseases
1
Nov

Grain Discolouration

Grain Discolouration:

Symptoms:  

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Mr.Chaitanya (DRR)
1
Nov

Rice Tungro Virus: RTV

Rice Tungro Virus: RTV

Causal Organism: The virus is transmitted by the Green leaf hopper N. virescens and N. niggropictus.

Symptoms:

  • The diseased plants exibit orange yellow discolouration of leaves from the tip downwards.  
  • The young leaves show mosaic mottling. The plants are dwarfed with poor tillering and become sterile.

Control:

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Dr.Krishnaveni DRR
1
Nov

Sheath Rot

Sheath Rot

Casual Organism: Saracladium Oryzae

Symptoms:

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Dr.Krishnaveni DRR
1
Nov

Sheath Blight

Sheath Blight

Casual Organism: Rhizoctonia Solani

Symptoms:  

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Dr.Krishnaveni DRR
1
Nov

Brown Spot

Brown Spot

Casual Organism: Helminthosporium Oryzae

Symptoms:  

  • The leaves show oval shaped foliar spots with yellow halo.Severely affected field presents a reddish appearance.
  • Grain become discoloured.

Control:

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Dr.Krishnaveni DRR
1
Nov

Blast

Blast

Casual Organism : Pyricularia Grisera

Symptoms:

The leaves show spindle shaped spots with grey centre and dark brown margin.  

The lesions enlarge and cause drying of leaves. The nodes and neck regions turn black and cause rotting and breaking with complete/partial chaffiness of earhead.

File Courtesy: 
DRD, Patna
Photo Courtesy: 
Dr.Krishnaveni DRR
6
Aug

Grain discoloration

Symptoms

1. This occur at the time of panicle initation stage.

2. At this time normal grain color changes to brownish white color.

Management

1. Seed treatment with Bavistin (0.2%) or vitavax (0.2%) for 6 hrs.

2. Spary bavistin 0.1 %

File Courtesy: 
IGKV,Raipur
6
Aug

Khaira disease

Symptom

1. Usually in nursery; chlorotic/ yellow patches at leaf base on both sides of the midrib; restricted root growth and usually main roots turn brown.

Management

1. Use 25kg Znso4/ha before transplanting or sowing at time of land preparation.

2. If crop is infected then use 5 kg Znso4 + 25 kg lime in 600-700 litre water per hectare.

File Courtesy: 
IGKV,Raipur
6
Aug

False smut

Causal organism:- ustilago noidea virus

Symptom

1. False smut start as light green ball of spores covered by a thin silver colored skin. The balls erupt exposing the orange spores.

2. As time passes spores turn dark green to black. Damage from smuts occur due to contamination of other grains by spores during harvest, miiling causing quality problems and discoloration during paraboiling and cooking.

Management

1. Excessive nitrogen increases diseases.

2. Use resistant varities

File Courtesy: 
IGKV,Raipur
6
Aug

Sheath blight

Causal organism: Thanatephorus cucumeris

Symptoms

1. initial infection occur on the stem near the water lime and appear as water soaked oval lesion which often dries and turns tan.

2. All the plant parts are susceptible to infection except roots. Sheath tends to develop in circular areas in the field and cause what are called bird nests.

3. It starts as white bean like structures that turn dark brown to black

File Courtesy: 
IGKV,Raipur
Photo Courtesy: 
IGKV,Raipur
6
Aug

Brown spot

Causal organism: Helminthosporium oryzae

Symptoms:

1. Many dark brown elliptical spots on leaves; infects coleoptiles of seedling and causes blightining; infected kernel shriveled.

Management

1. Seed treatment before sowing with carbandazim (2.5g/kg).

2. Treatment with fungicide like mancozeb 0.25% or Adinophos 0.1%.

File Courtesy: 
IGKV,Raipur
Photo Courtesy: 
IGKV,Raipur
6
Aug

Sheath rot

Causal organism- Magnoporthe Salvinii

Symptom:

1. Disease infect rice after tillering.

2. The initial infection occurs on the stem in the leaf sheath and towards maturity penetrating in to the culm often causing lodging.

3. Below sheath small dark brown spots formed which have no shape. Because of this diseases panicle do not emerges

4. If the panicle emerges grains do not fill and cause yield loss.

6
Aug

Bacterial leaf blight (BLB)

Symptom of Bacterial leaf blight

1. ‘Kresk’ occurs in early stage (plant withers and dries up), in later stage blightining starts from the tip of the leaves to the base, straw turned yellow, partially filled grains.

Management

1. Use balanced fertilizer dose.

2. Drain out excess of water.

3. Use resistant varities like Sawa masuri, Bambleshwari.

File Courtesy: 
IGKV,Raipur
Photo Courtesy: 
IGKV,Raipur
6
Aug

Rice blast

Local name: Causal organism: magnaporthe grisea

1. This diseases affects the crop at all the crop stages viz., nursery, tillering and flowering. The yield loss ranges from 36-50 % depending upon the variety and environment condition.

2. Typical leaf lesion are spindle shaped, usually with redish yellow margin; grey in the centre.

File Courtesy: 
IGKV,Raipur
4
Aug

Rice yellow dwarf

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishnaveni (DRR)
4
Aug

Rice tungro virus

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishna Veni (DRR)
4
Aug

Bacterial leaf streak

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
http://www.sciencephotolibrary.com/images/download_lo_res.html?id=670017710
4
Aug

control measures of the Bacterial leaf blight

1. Spraying with copper fungicides (Blitox 0.3%) alternately with Streptocycycline (250 ppm).

2. Application of moderate dose of nitrogenous fertilizer (80 kg/ha) and use of wider spacing (30 x 15 cm) .

3. Growing resistant varieties to the disease .

File Courtesy: 
ICAR NEH, Umiam
4
Aug

Bacterial leaf blight

File Courtesy: 
ICAR NEH, Umiam
Photo Courtesy: 
Dr.Krishna Veni (DRR)
4
Aug

Grain discolouration

1. Discoluration of rice grains. is becoming a major problem in certain varieties of rice both in upland and lowland conditions. It redUces the germination, causes decay of seedlings, produces chaffy grains and lowers the consumption quality of the grains.
2. The disorder may be limited to individual grains, but in severe cases almost the entire panicle including the rachis becomes discoloured.

File Courtesy: 
ICAR NEH, Umiam
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