Brinjal diseases

Major Brinjal diseases are:-

1.Bacterial WiltPseudomonas solanacearum

bacterial wilt of Brinjal
  • Bacterial Wilt symptoms on leaf surface Wilting, stunting, yellowing of the foliage and finally collapse of the entire plant are the characteristic symptoms of the disease.
  • Lower leaves may droop first before wilting occurs.
  • The vascular system becomes brown.
  • Bacterial ooze comes out from the affected parts.
  • Plant show wilting symptoms at noontime will recover at nights but die soon.
  • Pant samrat variety is tolerant.
  • Crop rotation with cruciferous vegetables such as cauliflower help in reducing the disease incidence.
  • Fields should be kept clean and effected parts are to be collected and burnt.
  • Spray Copper fungicides to control the disease (2% Bordeaux mixture.)
  • The disease is more prevalent in the presence of root knot Nematodes, so control of these nematodes will suppress the disease spread.


2.Cercospora Leaf Spot :Cercospora solani -melongenae, C. solani

Cercospora leaf spot of brinjal

  • The leaf spots are characterised by chlorotic lesions, angular to irregular in shape, later turn grayish-brown with profuse sporulation at the centre of the spot.
  • Severely infected leaves drop off prematurely, resulting in reduced fruit yield.
  • Pant Samrat variety is resistant to both the leaf spots.
  • Diseases can be managed by growing resistant varieties.
  • Spraying 1 per cent Bordeaux mixture or 2 g Copper oxychloride or 2.5 g Zineb per litre of water effectively controls leaf spots.


3.Alternaria leaf Spot: Alternaria melongenae, A. solani

Alterneria leaf spot of Brinjal

  • Cracks appearing in leaf spot
  • The two species of Alternaria occur commonly, causing the characteristic leaf spots with concentric rings.
  • The spots are mostly irregular, 4-8 mm in diameter and may coalesce to cover large areas of the leaf blade.
  • Severely affected leaves may drop off.
  • A. melongenae also infects the fruits causing large deep-seated spots.
  • The infected fruits turn yellow and drop off prematurely.
  • Spraying 1 per cent Bordeaux mixture or 2 g Copper oxychloride or 2.5 g Zineb per litre of water effectively controls leaf spots.


4.Damping off: Pythium aphanidermatum, Pythium indicum, Phytophthora parasitica, Rhizoctonia solani andSclerotium rolfsii.

brinjal damping off brinjal damping offSymptom:
  • Sudden collapsing of the seed lines occur in the seed bed.
  • The seedlings are attacked at the collar region and the attacked seedlings are toppled down.
  • The disease spreads through fungi present in the soil. The disease spreads through fungi present in the soil.
  • The disease can be controlled by seed treatment with agrosan or ceresin @2gm/kg of seed


5.Tobacco mosaic virus (TMV)

tobacco Mosaic virus in brinjal

  • Mosaic mottling of leaves and stunting of plants are the characteristic symptoms of potato virus Y Mosaic symptoms are mild in early stages but later become severe.
  • Infected leaves are deformed, small and leathery. Very few fruits are produced on infected plants.
  • The important symptom produced by tobacco mosaic virus is conspicuous mottling of leaves.
  • Leaves also develop blisters in advanced cases. Severely infected leaves become small and misshapen. Plants infected early remain stunted.
  • PVY is easily sap transmitted.
  • It is transmitted in the field through aphids, Aphis gossypii and Myzus persicae and perpetuates on weed hosts like Solanum nigrum and S.xanthocarpum.
  • TMV is transmitted by sap, contaminated implements and clothes, soil debris and hands of labour.
  • It can perpetuate on many cultivated plants like cucurbits, legumes, pepper, tobacco, tomato and weed hosts. The virus survives in plant debris in the soil.
  • Destroy all weeds and avoid planting cucumber, pepper, tobacco, tomato near brinjal seed beds and field.
  • Wash hands with soap and water before working in seed beds.
  • Prohibit smoking or chewing of tobacco who are handling brinjal seedlings.
  • Spray insecticides like Dimethoate 2 ml/litre or Metasystox 1 ml/litre of water to control the insect vectors.


6.Collar rot: Sclerotium rolfsii

brinjal collar rot

  • The disease occasionally occurs in serious form.
  • The lower portion of the stem is affected by the soil borne inoculum (sclerotia).
  • Decortications is the main symptom.
  • Exposure and necrosis of underlying tissues may lead to the collapse of the plant.
  • Near the ground surface on the stem may be seen the mycelia and sclerotia.
  • Lack of plant vigour, accumulation of water around the stem, and mechanical injuries help in the development of this disease.
  • Seed treatment with 4 g of Trichoderma viride formulation per kg seed will help in reducing the disease.
  • Spraying with Mancozeb @ 2g/Litre of water.
  • Collection and destruction of diseased parts and portions of the plant.



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