THE CROP DISEASES OF SIKKIM HIMALAYAS

CROP: MANDARIN ORANGE
Scientific Name Citrus reticulate
Local Name  Santra
Family Rutaceae
State/World wide Sikkim, Assam, Meghalaya, Nagpur, Darjeeling Nepal, Bhutan
Photo Source
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Common Name of Disease:  3.CITRUS CANKER
Local Name of Disease -
Causal Organism -Xanthomonas compestris p.v.citri
Distribution of Disease in Sikkim

-Throughout citrus growing areas of the state.
Disease Incidence -Moderate
Site of Infection

-The disease appears on leaves, twigs, petioles, branches, fruits, fruit stalk including thorns.
Dissemination of the Disease -

Symptoms
At the initial stage minute water soaked lesion appears as yellow spot and gradually enlarges up to 2-4mm in diameter and appear as raised rough brownish corky pustules on leaves or other parts of the plant. On leaves, the pustules are surrounded by a characteristic yellow halo.The canker lesion on fruit do not possess yellow halo..
Favourable environmental condition for disease
The climatic factors most favourable are high temperature and precipitation during period of most rapid growth of the citrus tree.  
Mode of Transmission
Both seed and soil-borne disease.
Life cycle of Organism -
Plant Protection Measures
  • Prone off the infected plant parts and burnt them.
  • 1% Bordoux misture can be sprayed soon after preparation.
  • Spray with 500 ppm streptocycline sulphate at 15 days interval.


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    Bioinformatics Sub- DISC, SSCS&T