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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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4.
FUSARIUM WILT |
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Local Name of Disease |
-Ohilini bimar |
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Causal Organism |
- Fusarium oxysporum |
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Distribution of Disease in Sikkim
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Reported from some green house grown crop from tadong 5th
mile few years back. Few places from Onlop West Sikkim.
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Site of Infection |
- Roots are
first attack by the pathogen followed by stems.
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Dissemination of the Disease |
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The fungus becomes established
readily in many soil types, such soils
remaining infested almost indefinitely. The
chief method is by transplants, wind-borne
soil, surface drainage water, water-borne
soil, and implements
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Symptoms
Yellowing of lower
leaves appear first, usually affecting the leaflets
unilaterally. The affected leaves die, and the symptoms
continue to appear on successively younger leaves. One or
two branches may be affected while others remain symptom
less. After the disease has advance for a few weeks,
browning of the vascular system may be seen in cross section
of the lower stem. The as a whole is stunted and permanent
wilting of leaves take place.
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Favourable environmental condition for
disease
The fungus requires low soil moisture, short day length;
low high intensity; nutrient low in nitrogen, high in
potassium, low in phosphorus, or low pH.
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Mode of Transmission
Same as in
dissemination of disease.
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Life cycle of
Organism -
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Plant Protection
Measures
Use
of resistant varieties, rouging out of diseased plants.
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| Bioinformatics Sub- DISC, SSCS&T |
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