THE IMPORTANCE OF THE USE OF ROOTSTOCKS WITH HYPERSENSITIVITY RESISTANCE TO PPV FOR THE CULTIVATION OF HYPERSENSITIVE EUROPEAN PLUM CULTIVARS

The behavior of 6- to 10-year-old trees of two hypersensitive plum cultivars (`Jojo', `Hoh 4517') grafted onto a PPV sensitive rootstock under natural PPV inoculation conditions was observed. Some of the rootstocks got infected with PPV. In case of `Jojo', no effect on the phenotype of the crown part could be observed. In case of `Hoh 4517', single young shoots showed necrosis on the young shoots. These lesions facilitated secondary infections with Pseudomonas bacteria which then led to the death of whole branches. In order to avoid these damages it is highly recommended to use rootstocks with hypersensitivity resistance for all scion cultivars with hypersensitivity resistance to PPV.     «

The behavior of 6- to 10-year-old trees of two hypersensitive plum cultivars (`Jojo', `Hoh 4517') grafted onto a PPV sensitive rootstock under natural PPV inoculation conditions was observed. Some of the rootstocks got infected with PPV. In case of `Jojo', no effect on the phenotype of the crown part could be observed. In case of `Hoh 4517', single young shoots showed necrosis on the young shoots. These lesions facilitated secondary infections with Pseudomonas bacteria which then led to the deat...     »