Best Viewed in Mozilla Firefox, Google Chrome

Diseases

Diseases
27
Jul

Symptoms of Rice blast disease (Karapa)

1. The disease is first seen as elliptical gray-white lesions with reddish edges on the leaves (leaf blast) and stems of the plant.

2. The lesions run parallel to the long axis of the leaf or stem.

3. Most damage occurs when the fungus spreads to the area below the seed head of the plant, causing it to break off (rotten neck).

File Courtesy: 
RARS, Karjat
27
Jul

Rice blast disease (Karapa)

1. Causing organism of Rice blast: Pyricularia oryzae.

2. Marathi name: Karapa.

3. P. oryzae is an ascomycete fungus, a member of the sac fungi.

4. One of the features of these fungi is that they generate spores, called conidia or conidiospores, that can be easily dispersed by the wind and splashing rain.

File Courtesy: 
RARS, Karjat
Photo Courtesy: 
RARS, Karjat
19
Jul

Control of Rice Root-Knot Nematodes in Karnataka

1. Cultural control measures of Rice Root-Knot nematode includes continuous flooding, raising the rice seedlings in flooded soils, and crop rotation. These practices will help prevent root invasion by the nematodes.

2. Soil solarization, bare fallow period and planting cover crops such as sesame and cowpea has been reported to decrease nematodes. Rotation crop like marigold (Tagetes sp.) is also effective in lowering root knot nematode populations because of its nematicidal properties.

File Courtesy: 
ZARS, Mandya
19
Jul

Damage of Rice Root-Knot Nematode in Karnataka

Symptoms of Rice Root-Knot Nematode are

1. Rice Root-Knot Nematode can be detected when plants are uprooted as it causes swellings and galls throughout the root system. Infected root tips become swollen and hooked, a symptom which is especially characteristic of this nematode.

2. In upland conditions and shallow intermittently flooded land it can cause severe growth reduction, unfilled spikelets, reduced tillering, chlorosis, wilting and poor yield. Symptoms often appear as patches in a field.

File Courtesy: 
ZARS, Mandya
19
Jul

Rice Root-Knot Nematodes in Karnataka

 

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
CRRI
19
Jul

Control of Bacterial Leaf Streak disease in Karnataka

Chemical control measures of Bacterial Leaf Streak disease are,

1. Use of copper fungicides may help prevent disease occurrence and stop further disease spread.

2. Kocide (containing copper hydroxide) is effective against bacterial leaf diseases of rice such as leaf blight and streak.

3. Fungicide application must be done not later than 40 DAS. Beyond this, the bacteria must have taken their place inside the leaf.

File Courtesy: 
ZARS, Mandya
19
Jul

Symptoms of Bacterial Leaf Streak disease in Karnataka

 

1. Symptoms of Bacterial Leaf Streak disease are initially, small, dark-green and water-soaked streaks on interveins from tillering to booting stage.

2. Streaks dark-green at first and later enlarge to become yellowish gray and translucent.

3. Numerous small yellow beads of bacterial exudates on surface of lesions on humid conditions.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
http://www.sciencephotolibrary.com/images/download_lo_res.html?id=670017710
19
Jul

Bacterial Leaf Streak of Rice in Karnataka

1. Bacterial Leaf Streak of Rice disease is usually observed during the tillering stage of the rice crop.

2. If the Bacterial Leaf Streak appeared in the later growth stages, the rice plant can easily recover and grain yield losses are minimized.

3. Preferred scientific name: Xanthomonas oryzae pv. oryzicola (Fang et al. 1957) Swings et al. 1990.

File Courtesy: 
ZARS, Mandya
19
Jul

Control Measures of Bacterial Blight in Karnataka

Chemical control of Bacterial Blight,

1. Seed treatment with streptocycline @ 0.5 g/lit. Prepare 50 liter water solution using the streptocylcine and soak for 24 hrs, dry under shade and use for sowing.

2. Foliar spray with streptocycline @ 0.4 g + copper oxychloride @ 1 g /lit of water at 50 DAT and at seed setting stage.

3. Copper fungicides containing 50% copper oxychloride have been found to be quite effective.

4. Agrimycin-100 has also been reported to be effective against bacterial blight.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
ZARS, Mandya
19
Jul

Symptoms of Bacterial Blight in Karnataka

 

1. Symptoms appear on leaves of young plants, after planting out, as pale-green to grey-green, water-soaked streaks near the leaf tip and margins. These lesions coalesce and become yellowish-white with wavy edges.

2. The whole leaf may eventually be affected, becoming whitish or greyish and then dying. Leaf sheaths and culms of more susceptible cultivars may be attacked.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
ZARS, Mandya
19
Jul

Bacterial Blight of Rice in Karnataka

 

1. Common names: rice leaf blight, rice bacterial leaf blight, rice kresek disease, bacterial leaf blight of rice, kresek disease.

2. Preferred scientific name: Xanthomonas oryzae pv. Oryzae (Ishiyama 1922 Swings et al. 1990).

3. Bacterial leaf blight is one of the most destructive diseases of rice in India especially in the irrigated and rainfed lowland ecosystems.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
ZARS, Mandya
18
Jul

Control measures of Udbatta Disease in Karnataka

Control measures of Udbatta Disease include cultural and chemical measures.

Cultural practices: Clean seeds should be used to minimize the occurrence of the disease.

Burn the infected plants or plants showing udbatta symptoms.

Hot water seed treatment at 540C for 10 minutes.

Removal and destruction of diseased panicles in field .

Chemical Practices: Hot water treatment at 540C for 10 min and fungicide such as Granosan MDB + Vitavax were found to be effectively check the disease.

File Courtesy: 
ZARS, Mandya
18
Jul

Symptoms of Udbatta Disease in Karnataka

 

1. Spikes infected by E. oryzae become somewhat mummified with partially formed buds and, in time, become darker in colour and more stromatic as conidial acervuli develop on the surface. When wet, these conidial acervuli appear gelatinous and produce a saucer-shaped fructification bearing a palisade of conidiophores.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Udbatta Disease in Karnataka

 

Common names of Udbatta Disease : Udbatta disease, Udbatta, Black choke, Incense rod, False ergot, Black ring, Sterility disease, Agarbatti disease of rice.

Preferred scientific name of Udbatta Disease: Balansia oryzae-sativae (Hashioka, 1971).

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Symptoms of False Smut disease in Karnataka

 

1. Symptoms become evident on infected grains after flowering: a grain turns into a large velvety mass (pseudomorph). The pseudomorphs are small to more than 1 cm in diameter, and enclose the floral parts. The colour changes from silvery-white to orange-yellow to olive-green when mature.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Rice False Smut disease in Karnataka

Common names of False Smut disease: False smut, green smut.

Preferred scientific name of False Smut: Ustilaginoidea virens (Cke.) Tak. (1896) [anamorph].

Distribution and Occurrence of False Smut: Found in coastal areas of Karnataka and sporadic (Singh, 1984 and POS report, 2009).

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Control measures for Foot Rot Bakanae disease in Karnataka

Control measures of Foot Rot Bakanae disease include cultural and chemical control measures.

Cultural practices: Clean seeds should be used to minimize the occurrence of the disease. Salt water can be used to separate lightweight, infected seeds from seed lots and thereby reduce seed borne inoculum.

File Courtesy: 
ZARS, Mandya
18
Jul

Symptoms of Foot Rot Bakanae disease in Karnataka

1. On rice, G. fujikuroi causes bakanae, foot rot, seedling rot, grain sterility and discoloration (Ou, 1985). Seedlings with bakanae in the seedbed are several inches taller than normal plants, thin and yellowish-green.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Symptoms of Foot Rot Bakanae disease in Karnataka

1. On rice, G. fujikuroi causes bakanae, foot rot, seedling rot, grain sterility and discoloration (Ou, 1985). Seedlings with bakanae in the seedbed are several inches taller than normal plants, thin and yellowish-green.

File Courtesy: 
ZARS, Mandya
Photo Courtesy: 
Dr. D. Krishnaveni (DRR)
18
Jul

Foot Rot Bakanae Disease in Karnataka

 

Common names: Bakanae disease of rice, Pokkah boeng, White stalk of rice, Sett rot of sugarcane, Stalk rot of maize, Maize stalk rot, Stem rot of rice, Stem and Ear rot of sweet corn, Pseudo-stem rot of plantain.

Distribution and Occurrence: In Karnataka, the disease is scattered in few rainfed rice growing regions (Suseelendra et al., 1991).

File Courtesy: 
ZARS, Mandya
Syndicate content
Copy rights | Disclaimer | RKMP Policies