Brinjal alternaria leaf spot

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
@agritech.tnau.ac.in

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.