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THE CROP DISEASES OF SIKKIM
HIMALAYAS |
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CROP:
TOMATO
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Scientific Name |
Lycopersicum esculentum |
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State/World wide |
South America; States:
U.P, W.B, Bihar, H.P,T.N,Punjab, Gujrat,
Sikkim, Meghalaya, etc.
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Common Name of Disease:
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2. EARLY BLIGHT |
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Local Name of Disease |
-Alternaria solani |
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Causal Organism |
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Phytopthora
infestens |
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Distribution of Disease in Sikkim
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In parts of the state.
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Disease Incidence |
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Low to medium |
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Site of Infection |
- Symptom is
more prominent on leaves.
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Dissemination of the Disease |
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The pathogen survives in plant debris in the
soil. |
Symptoms
The symptoms appear first on
older leaves. Necrotic spots of angular or oval in shapes
with or without concentric rings appear on leaves.There is chlorotic zone around the spots due to the toxin (alternaric
acid).
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Favourable environmental condition for
disease
Early blight is less affected by weather, therefore, can
occur in cool as well as dry weather.
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Mode of Transmission
Through
infected crop debris left in the soil.
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Life cycle of
Organism -
Mycelium
or conidia survives in plant debris in soil.
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Plant Protection
Measures
Grow
resistant variety ( Kufri Bad Shaw ) is resistant to both
late blight and early blight.
Since it a soil borne disease, crop rotation and field
sanitation is necessary to control the disease.
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| Bioinformatics Sub- DISC, SSCS&T |
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