Abstract
In November 2008 in Himachal Pradesh and Chandigarh regions in India, toon trees and periwinkles were observed to have formed short internodes, small leaves and witchesâ-broom symptoms, typical of phytoplasma infection. The symptomatic toon and periwinkle samples were tested with universal PCR tests, and the 16S rRNA, rplB-rpsC, secA and secY genes were sequenced. The causal agents belonged to subgroup 16SrI-B of âCandidatus Phytoplasma asterisâ, based on 16S rDNA, ribosomal protein gene, secA and secY phylogenetic analysis.
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