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A field survey was conducted in 2018 to study the incidence of citrus tristeza virus (CTV) and its aphid vectors, in different citrus growing regions of the states of Assam and Nagaland, India. Leaf samples of Assam lemon (Citrus limon) and Khasi mandarin (Citrus reticulata) were collected from four districts of Assam (Jorhat, Tinsukia, Sivasagar and Golaghat) and two districts of Nagaland (Mokokchung and Wokha). Citrus leaf samples were collected from a total of 190 citrus plants and were used for detection of CTV infection through Double Antibody Sandwich-Enzyme linked Immuno-Sorbent Assay (DAS-ELISA). According to the results, 75 per cent CTV disease incidence was detected in surveyed areas of Assam and 24.55 per cent CTV disease incidence was detected in surveyed areas of Nagaland. District wise, the highest CTV disease incidence (96.67 %) was detected in Tinsukia district of Assam and the lowest (21.43 %) was detected in Mokokchung district of Nagaland. Aphid samples were also collected during the survey and the presence of the vector Toxoptera citricida, in all the locations was determined.

Incidence of Citrus Tristeza Virus and its Vector Toxoptera citricida in Different Parts of Assam and Nagaland, India