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Integrated Management of Deadly Bacterial Blight disease in Pomegranate

Posted by Dr. Asha K M on

Bacterial blight in pomegranate is a major disease which is caused by Xanthomonas axonopodis pv. Punicae. Pomegranate bacterial blight has become a very serious threat to pomegranate growers in the country. Bacterial blight in pomegranate leads to deceased yield (nearly by 90 %) and quality of fruits affecting the marketing value of fruits. 

 

Symptoms:

Brownish circular spots surrounding yellow rings appear on leaves, gradually which becomes necrotic and turns black. Later the affected leaves turn yellow and fall off from the plants.

 

The disease even spreads to flowers, which lead the way for falling of flowers reducing fruit set.

 

The disease is more severe during the fruiting season. Black spots appear on fruits which later increase in size and cover the whole fruit surface causing cracking/splitting of fruits. Further the infected fruits will start to rot.

 

The disease even spreads to branches and stem, which leads to drying of those affected parts, under severe condition it leads to death of branches.

The infected branch will turn yellow and dry 15 days after infection. Again 15 days later the other branches will start to dry, in this way the whole plant will get affected and start to dry.

 

If the infected branch is cut open, it shows brown patches. Before dying of infected plant, the complete leaves will turn yellow.    

      

Causes:

1. Relative humidity of > 50% and temperature range between 25-35 ° C favours the disease development

2. Irregular rains with cloudy weather conditions are most favourable for the fast development of bacterial blight disease in pomegranate

          

3. Deficiency of nutrients makes the plants weak and more susceptible for disease development

4. The bacteria responsible for causing the disease is air borne and spreads through rain splashes with heavy wind

5. The bacteria causing blight to pomegranate will enter the plant tissues either through natural openings or injuries

6. The disease incidence is more severe during the fruiting time

 

Preventive measures

  1. Use healthy planting material for planting
  2. Maintain cleanliness in the orchard by removing all infected plant parts and destroy them by burning
  3. Apply adequate and all recommended dosage of fertilizers along with well decomposed farm yard manure and vermicompost which increases the resistance of plants against disease

  1. As a prophylactic measure, application of bio agents such as Pseudomonas sps, Bacillus sp and Trichoderma sp will give resistance against bacteria causing blight

SI. No.

Technical Name

Trade Name

1

Trichoderma

(Ecoderma @ 20g/lit or Sanjeevni @ 20g/lit or Multiplex Nisarga @ 1mL/lit or Treat Bio-Fungicide @ 20g/lit or Alderm @ 2-3mL/lit )

2

Pseudomonas

 (Bactvipe @ 1ml/Lit or Ecomonas 20g/Lit or Spot @ 1ml/Lit or Almonas @ 2-3 mL/Lit or Bio-jodi @ 20g/Lit)

3

Bacillus sps

(Mildown @ 1ml/Lit or Delfin @ 20g/Lit or Abacil @ 2-3 mL/Lit or Bio-jodi @ 20g/Lit or Milastin K @ 2mL/Lit or Aphos @ 2-3 mL/Lit or TB-2 Fertidose @ 2ml/Lit or TB-3 Fertidose @ 2ml/Lit)    

 

  1. During severe incidence of bacterial blight, take hasta bahar crop (by pruning during September-october) and give rest to the crop from December to May which reduces the percentage of disease
  2. Before pruning spray with 1% Bordeaux moisture to reduce the severity of disease and then spray with Ethrel to defoliate the plants and destroy foliage by burning
  3. Use sanitized tools for pruning

  1. After pruning, smear the basal trunk of the infected plants with a mixture of Streptocyclin or Streptomycin sulphate (0.5gm) or Bactinash @ 0.5 gm + Copper Oxy Chloride @ 3gm/L which reduces the incidence. Use red soil for better smearing/application
  2. Prophylactic application of Salicylic acid @ 3 gm/L will improve the systemic acquired resistance of plants against the disease

 

Management:

Farmers should always follow integrated approach methods along with preventive measures to effectively manage with bacterial blight in pomegranate because chemical control alone isn’t successful.

The below combination sprays may help to manage with bacterial blight disease in pomegranate

  1. During initial stage of disease

Spray with Bactinash @ 0.5 gm/L or Streptomycin sulphate @ 0.5 gm/L (Plantomycin or Crystocycline) + Copper oxy Chloride @ 3 gm/L (Blue copper fungicide or Cuprina or Blitox or Value gold)

 

  1. During severe incidence of disease

Spray with Copper Hydroxide (Kocide) @ 2.5 gm/L + Bactinash @ 0.5 gm/L + Streptocyclin @ 0.5 gm/L (Plantomycin or Crystocycline)

Note:

  1. After every application of bactericide spray the plants with a combination of ZnSo4 @ 1gm + MgSo4 @ 1 gm + CaSo4 @ 1gm + Boron @ 1gm + SOP @ 3gm/Litre of water which helps in effective management of disease and also increases the resistance of plants against disease

Or

After every bactericide application spray with General Liquid micronutrient @ 2.5 mL/L + SOP @ 3 gm/L

  1. For effective management of Bacterial blight in Pomegranate, the above mentioned all integrated management approaches should be followed by whole farming community
  2. Soil application of a mixture of Bio agents such as Trichoderma harzianum (Ecoderma or Sanjeevni or Multiplex Nisarga or Treat Bio-Fungicide or Alderm), Pseudomonas fluorescence (Bactvipe or Ecomonas or Spot or Almonas or Bio-jodi) and Paceilamyces fumosoroseus (Almite or Agri Nematode- Liquid) @ 50gm each per plant at the time of planting as well as repeating every 6 months will help in developing resistance against various biotic and abiotic stress including bacterial blight

 

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Dr. Asha, K.M.,

Agronomist, BigHaat

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For more information kindly call on 8050797979 or give missed call on 180030002434 during office hours 10 AM to 5 PM

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Disclaimer: The performance of the product (s) is subject to usage as per manufacturer guidelines. Read enclosed leaflet of the product(s) carefully before use. The use of this product(s)/ information is at the discretion of user.

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