Host Reactions of Mechanically Transmissible Legume Viruses of the Northern Temperature Zone

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Abstract
Reactions of 23 plant hosts to inoculation with each of 38 legume viruses, and a key to aid in the diagnosis of these viruses, are presented. The virus isolates, investigated at locations where they are indigenous, were either type cultures or had been equivalently characterized. Each of the hosts was derived from standardized seedstocks. Specific viruses were tested against identical host germ plasm. The key is based on some 1700 symptomatological data and virus host ranges obtained from selected plant hosts. The final key formulation was derived from evaluations of all possible combinations and hierarchies of plant hosts. Assuming that each virus will infect and induce characteristic symptoms when inoculated into defined cultivars under suitable conditions, the key is an aid to identification for each of the 38 viruses tested. Evaluations of 2-4 separate isolates of certain viruses supported the diagnostic value of the key.

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