(...) Aphid subcultures of several original source isolates that induce CTV decline, seedling yellows, and sweet orange and grapefruit stem pitting were compared for host reactions. All disease components were transmitted. Reduction of virulence of some aphid-transmitted subcultures was obtained by deliberate selection of variants in Mexican lime indicators compared with the original isolate(...)
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R. K. Yokomi (1989) studied this question.
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