Susceptibility of different grapevine (Vitis vinifera L.) cultivars to Diplodia seriata and Diplodia mutila

Abstract

Canes obtained from one-year-old stems of the grapevine cultivars Cabernet Franc,

Malbec, Merlot, Sauvignon Blanc and Syrah (all non-grafted) were used as models to test

their susceptibility to Diplodia seriata and Diplodia mutila. The results showed that the mean

length of lesions caused by D. mutila was 3.2 times larger than that produced by D. seriata. In

addition, the Cabernet Franc and Syrah cultivars were the most susceptible to D. mutila, while

Merlot and Malbec were the least susceptible. No significant differences were observed between

cultivars inoculated with D. seriata. The results are discussed in terms of the susceptibility of

the different grapevine cultivars to both pathogens.