Evaluation of resistance to downy mildew in grape varieties grown in a Spanish collection

摘要: The genotypic diversity maintained in grapevine repositories can provide an invaluable source of resistance to diseases. Resistance downy mildew (Plasmopara viticola) most main and minor varieties grown Spain was evaluated the germplasm collection at "El Encin" (IMIDRA, Madrid). assessment using leaf disc technique compared with results field evaluations natural infected plants according OIV452-1 OIV452 descriptors, respectively. A good correlation found among both methods. Results ranged from very low high levels fungal infection, showing susceptibility, as expectable Vitis vinifera varieties, but some them (usually those originally collected humid temperate regions Spain) were be less susceptible.