Scientific Name Citrus reticulate
Local Name  Santra
Family Rutaceae
State/World wide Sikkim, Assam, Meghalaya, Nagpur, Darjeeling Nepal, Bhutan
Common Name of Disease: 1. CITRUS DIE-BACK
Local Name of Disease -
Causal Organism -Colletotrichum gloeosporioides
Distribution of Disease in Sikkim

-Disease has been reported from the four districts of Sikkim.

Disease Incidence -Moderate to High
Site of Infection

- The leaves become yellow and fall with the beginning of summer and die-back of twig starts leading to drying of branches and declining –death of trees.

Dissemination of the Disease - It is a seed-borne and soil borne disease.


Symptoms first appear on older leaves. The mid rib and veins become yellow and later turn into orange yellow. Molting of leaves take place. The new leaves are swollen in shape and on touching some bristles are felt. Following year even the interveinal areas become chlorotic. Plant growth is stunted and appears bushy.Gradually the whole plant dies from top to bottom.

Favourable environmental condition for disease
Presence of hard pan at the root growing zone (rhizosphere), preventing root penetration into the soil thereby hindering nutrient uptake by the roots for proper growth and development.Growing citrus too near to the edge of the terraces. Causing mechanical injuries to the roots during tillage for intercropping. Grazing cattle in the orange orchard. Citrus die-back is not a disease but a disease syndrome i.e., combined affect of both biotic and abiotic factors

Mode of Transmission
Transmission of disease take place through infected planting materials, mechanically through contaminated pruning knife and sometimes from soil borne pathogen.

Life cycle of Organism -

Brief history of the disease -

Bioinformatics Sub- DISC, SSCS&T