Relationship between the oospore dose in the leaf litter above the vineyard ground and primary infections by <i>Plasmopara viticola</i>.

ABSTRACT: Plasmopara viticola, the grapevine downy mildew (DM) oomycete, overwinters as oospores in fallen leaves above the vineyard ground. The oospores repeatedly germinate in the following season, causing primary infections on the leaves and clusters. In the present study, the relationship between the numbers of P. viticola oospores in the leaf litter and the dynamics of primary infections on grape leaves were studied for three years to assess whether the assessment of the oospore pool in a vineyard can provide information on the DM pressure. Five leaf litters were prepared by mixing DM-free and -affected leaves in varying proportions in the fall, including 100% DM-free leaves (LL0), 75% DM-free and 25% DM-affected leaves (LL25), 50% DM-free and 50% DM-affected leaves (LL50), 25% DM

SUBMITTER: Fedele G 

PROVIDER: S-EPMC11925907 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature