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The effect of some isolates of ryegrass mosaic virus on different genotypes of Lolium multiflorum.

SUMMARY 
 
Some isolates of ryegrass mosaic virus produced necrosis in Lolium multiflorum much more frequently than others. This frequency could be increased or decreased by selecting plants with or without necrosis, respectively, as sources of inoculum. Infection with the milder, mosaic-inducing isolates which rarely caused necrosis did not protect the plants against subsequent infection with the more severe necrosis-inducing isolates. Oat plants were infected much more readily by isolates which frequently caused necrosis than by the less necrotic isolates, but passage through oat appeared to have no effect on the frequency with which an isolate produced necrosis in ryegrass. 
 
 
 
Genotypes of L. multiflorum varied greatly in their tolerance of infection. Their level of tolerance was closely correlated with symptom expression. All genotypes tested were tolerant to a mild, mosaic-inducing, isolate. Two genotypes were tolerant to a severe, necrosis-inducing, isolate and to an original Rothamsted isolate; three genotypes were equally susceptible to both isolates, and two were more susceptible to the necrotic isolate than to the Rothamsted isolate.