The infection by Potato leafroll virus (PLRV) and by Potato virus Y (PVY) is the main cause of potato degeneration in Brazil. During two planting periods, September to December of 1999 and March to June of 2000, the % of infection of basic potato seeds by PLRV and PVY was determined, on potato producer regions of Rio Grande do Sul and Santa Catarina States. In the first period, 623 samples from nine regions were serologically tested (DAS-ELISA), revealing 17 and 3% of PVY and PLRV infections, respectively. The percentage of infection of cultivar Baronesa was 7,5 and 0,3%, Catucha 22 and 19%, Elvira 42 and 0%, and Monalisa 16 and 4%. In the second period part of the tubers harvested on the first one were planted, and 301 samples from two regions were tested, revealing a percentage of infection of 58% for PVY and 11% for PLRV. The percentage of infection of cultivar Baronesa was 67 and 6%, Catucha 68 and 49%, Elvira 94 and 2%, and Monalisa 35 and 0%.
Solanum tuberosum L.; seed potato; PVY; PLRV
