BRINJAL ALTERNARIA LEAF SPOT AND ITS MANAGEMENT

1. COLLEGE OF AGRICULTURAL TECHNOLOGY
(Affiliated to Tamil Nadu Agricultural University, Coimbatore-3)
Kullapuram (Po),ViaVaigai Dam, Theni-625 562
BRINJAL ALTERNARIA LEAF SPOT
STUDENT COURSE TEACHER
NAGALAKSHMI N Dr. PARTHASARATHY. S
2015021086 Asst. Prof. (Plant Pathology)

2. Disease Name:
Brinjal alternaria spot
Pathogen Name:
Alternaria melongenae

3. Systematic Position
Kingdom : Fungi
Phylum : Ascomycota
Class : Ascomycetes
Order : Pleosporales
Family : Pleosporaceae
Genus : Alternaria
Species : A. melongenae

4. Symptoms
• Cracks appearing in leaf spots.
• Cause 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.

5. • A. melongenae also infects the fruits causing large
deep-seated spots.
• The infected fruits turn yellow and drop off
prematurely.

6. Spot in initial stage Spot in later stage
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7. Pathogen
• Alternaria produces dry
spores, conidia bottle
shape.
• Muriform
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8. Pathogen description
• The mycelium is dull brown and septate, pale grey
yellow conidiophores which are straight or curved.
• The conidia are light olive coloured with
transverse and longitudinal septa.
• There are around 3-5 septate and conidia are in
chain over short conidiophore.

9. Favourable condition
• Low temperature (20°-25°C).
• High relative humidity.
• Cloudy weather.

10. Spread of disease
• The fungus is seed-borne and also soil-borne as it
remains dormant in infested plant debris.

11. Management
• Spraying 1% Bordeaux mixture or 2 g Copper
oxychloride or 2.5 g Zineb / litre of water.
• Removal and destruction of affected plant parts and
spraying the affected plants with Bavistin (0.1%)

12. References
• Chakrabarthi D.K, Sanjeev kumar, Gireesh chand, A
Guide Book for Diseases of Horticultural Crops,
Narendra publishing house, Delhi-14006, Third
edition pg(115).
• Thind T.S, Diseases of Fruits and Vegetables and
Their Management, Kalyani publishers, second
edition, New Delhi Pg(140).
• WWW. Kisansuvidha.com/brinjal-diseases.