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Citrus greening was observed for the first time in India in 1960 (3, 6, 7 ) . T h e disease was again observed at Modlimb, on Kagzi lime trees, in 1963. Thereafter it was commonly encountered in orchards in which trees were being indexed for virus-free budwood. T h e oriental citrus psyllid, Diaphorina citri Kuwayama, was established as the vector of greening pathogen in India (4).
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Capoor et al. (1974) studied this question.