Titlebook: Breeding for Disease Resistance; R. Johnson,G. J. Jellis Book 1992 Springer Science+Business Media Dordrecht 1992 Pathogen.crop plants.cro

Lucubrate

,Novel pathotypes of lettuce mosaic virus — breakdown of a durable resistance?,es or alleles. Pathotype IV possesses virulence for all lettuce lines so far tested. Some isolates of this pathotype are seed transmitted in cultivars possessing . or . and have caused severe crop losses in southern France. The durability of the resistance conditioned by these two genes is discussed