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Diseases

Diseases
12
Jul

Sheath Rot

Sheath Rot

Symptoms of Sheath Rot

1. Symptoms usually develop as lesions on sheaths of lower leaves near the water line when plants are in the late tillering or early internode elongation stage of growth (approximately 10 – 15 days after flooding).

File Courtesy: 
ADVANCES IN INTEGRATED RICE DISEASE MANAGEMENT ( Dr. Krishnaveni )
Photo Courtesy: 
Dr.Krishnaveni DRR
12
Jul

Red stripe

Red stripe

Local name: Kankara tegulu

Causal organism: Microbacterium sp.

Symptoms:

1. The symptoms of red stripe appeared on leaf blades or upper parts of leaf sheaths at the heading stage in the paddy fields.

2. A typical lesion consisted of an orange to reddish-brown spot with a long white halo that ran lengthwise from the spot to the leaf tip .

File Courtesy: 
APRRI , Maruteru
Photo Courtesy: 
APRRI, Maruteru
12
Jul

Control measures for Stem Rot

Control of stem rot

The follwoing measures can be adopted for controlling Stem rot in Rice:

  • Summer ploughing
  • Seed treatment
  • Optimum spacing
  • Avoiding stagnation of irrigation water.
  • Timely control of insect pests like stem borer and brown plant hopper
  • Spraying with validamycin @ 2.0ml or hexaconazole @ 2.0ml or propiconazole @ 1.0ml or benomyl 1.0g or carbendazim 1.0g per litre of water.
  • Thorough coverage of the crop canopy with spray fluid.
File Courtesy: 
APRRI , Maruteru
12
Jul

Stem rot

Stem rot

Local name : Kaandam kullu tegulu

Causal organism: Sclerotium oryzae

Symptoms:

The symptoms of Stem rot are:

1. The first symptom appears as small, black irregular lesions on the outer leaf sheath near the waterline.

2. The fungus penetrates the inner leaf sheath resulting the basal portion of the stem to rot.

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
Photo Courtesy: 
APRRI, Maruteru
12
Jul

Bacterial Leaf Blight

Bacterial Leaf Blight

Local Name: Aaku yendu thegulu

Causal organism: Xanthomonas campestris pv. oryzae,

Symptoms of Bacterial Leaf Blight

1. Bacterial leaf blight is a typical vascular disease and has three distinct phases of symptoms. viz., leaf blight phase, kresek phase and pale yellow leaf phase.

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
Photo Courtesy: 
APRRI, Maruteru
12
Jul

Control of Rice Blast

Control of Rice Blast :

The control measures of Rice Blast are as follows:

  • Growing resistant varieties
  • Seed treatment
  • Keeping field bunds weed free
  • Avoiding excess nitrogen application
  • Spraying with either tricyclazole 75WP @ 0.6g or isoprothiolane 40EC @ 1.5ml per litre of water.
File Courtesy: 
APRRI , Maruteru
12
Jul

Rice Blast

Rice Blast

There are two types of Rice blast

1. Leaf blast

2. Neck blast

Local name : Aggi tegulu

Symptoms of 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 ( Dr . Krishnaveni)
Photo Courtesy: 
APRRI, Maruteru
12
Jul

Control of Sheath blight

Control of Sheath blight:

The control measures of Sheath Blight include:

a. Summer ploughing

b. Seed treatment

c. Optimum spacing

d. Clean cultivation and timely weed control

e. Avoiding excess nitrogen application

f. Spraying with hexaconazole @ 2.0ml or validamycin @ 2.0ml or propiconazole @ 1.0ml per litre of water.

g. Thorough coverage of the spray chemical

File Courtesy: 
APRRI , Maruteru
Photo Courtesy: 
APRRI, Maruteru
12
Jul

Sheath blight

Sheath blight

Local name : Poda Thegulu

Causal organisam : Rhizoctonia solani

Symptoms :

1. Sheath blight disease usually appears in the later growth stages of the plant.

File Courtesy: 
Rice Blast Disease and its Management ( Dr . Krishnaveni)
Photo Courtesy: 
Dr.Krishnaveni DRR
12
Jul

Major rice diseases of Andhra Pradesh

Major rice diseases of Andhra Pradesh

Major rice diseases of Andhra Pradesh are

1. Sheath blight

2. Blast

3. BLB

4. Stem rot

5. Red stripe

6. Sheath rot

7. False smut

File Courtesy: 
APRRI , Maruteru
11
Jul

False Smut of Rice

- Use of recommended doses of fertilizer

. - Deep ploughing in summer stubbles.

- Avoid flow of irrigation water from infected fields to healthy fields.

- Chemical spray: 2 spray of 0.1% Propiconazole (Tilt) solution (1 gm/lt water). First spray before panicle emergence and second spray 10 days just after panicle emergence.

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
BAU Ranchi
11
Jul

Pathogen for False Smut of Rice

Ustilaginoidea virens (Syn : Claviceps oryzae - sativa)
Chlamydospores are formed on the sporeballs, they are spherical to elliptical, waxy and olivaceous

File Courtesy: 
BAU Ranchi
11
Jul

False Smut of Rice

Symptoms: The fungus transforms individual grains into greenish spore balls of velvetty appearance. Due to the development of thefructification of the pathogen, the ovaries are transformed into large velvetty green masses. Usually only a few spikelets in a panicle are affected

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
BAU Ranchi
11
Jul

Management for Bacterial Leaf Blight (BLB) of Rice

- Burn the stubbles.
- Use optimum dose of fertilizers.
- Avoid clipping of tip of seedling at the time of transplanting.
- Avoid flooded conditions.
- Remove weed hosts.
- Grow resistant cultivars like Birsamati, Birsa Vikas Dhan 110, Birsa Vikas Dhan 109, Hazaridhan, Sadabahar, Birsa Dhan 108, Shivam and Swarna showed resistance against bacterial leaf blight (BLB) of Rice.
- Seed Treatment: with Carbendazim 50 WP or Beam (Tricyclazole) @ 2 gm/kg seed.

File Courtesy: 
BAU Ranchi
11
Jul

Mode of Spread and Survival for Bacterial Leaf Blight (BLB) of Rice

The infected seeds as a source of inoculum may not be important since the bacteria decrease rapidly and die in the course of seed soaking. The pathogen survives in soil and in the infected stubbles and on collateral hosts like Leersia spp. Plantago najor, Paspalum dictum, and Cyanodon dactylon. The pathogen spreads through irrigation water in dry season and also through typhoons and rain storms.

File Courtesy: 
BAU Ranchi
11
Jul

Favourable conditions for Bacterial Leaf Blight (BLB) of Rice

Clipping of tip of the seedling at the time of transplanting, heavy rain, heavy dew, flooding, deep irrigation water, severe wind, temperature of 25-30OC and application of excessive nitrogen, especially late top dressing.

File Courtesy: 
BAU Ranchi
11
Jul

Pathogen for Bacterial Leaf Blight (BLB) of Rice

Xanthomonas oryzae pv. oryzae
The bacterium is strict aerobe, gram negative, non spore forming, rod shaped with size ranging from 1-2 x 0.8-1.0um with monotrichous polar flagellum of 6-8 um. The bacterial cells are capsulated and are joined to form an aggregate mass. Colonies are circular, convex with entire margins, whitish yellow to straw yellow later and opaque.

File Courtesy: 
BAU Ranchi
11
Jul

Bacterial Leaf Blight (BLB) of Rice

File Courtesy: 
BAU Ranchi
Photo Courtesy: 
BAU Ranchi
11
Jul

Management for Sheath Blight of Rice disease

- Avoid excess doses of fertilizers.
- Adopt optimum spacing.
- Eliminate weed hosts.
- Apply organic amendments.
- Avoid flow of irrigation water from infected fields to healthy fields.
- Deep ploughing in summer and burning of stubbles.
- Seed Treatment: with Carbendazim 50 WP or Beam (Tricyclazole) @ 2 gm/kg seed.

File Courtesy: 
BAU Ranchi
11
Jul

Mode of spread and survival of Sheath Blight of Rice disease

The pathogen can survive as sclerotia or mycelium in dry soil for about 20 months but for 5-8 months in moist soil. It infects more than 188 crop species in 32 families. Sclerotia spread through irrigation water.

File Courtesy: 
BAU Ranchi
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