THE RESPONSE OF SOME NEW PLUM CULTIVARS TO PLUM POX VIRUS (PPV)

The response of 11 plum cultivars to PPV infection had been studied during 6 years.
The observations of leaf and fruit symptoms, influence on tree growth and yield, spread of virus have been carried out.
The cultivar Cacanska Najbolja appeared to be the most tolerant to infection. C. Rana was tolerant with only some leaf symptoms, but almost no symptoms on fruit. C. Rodna expressed very severe leaf symptoms, and rather mild symptoms on fruit surface, very many fruit had dropped from infected trees.
Out of other studied cultivars: Amers, Stanley, Oneida, Ruth Gerstetter, Anna Spath expressed mild symptoms on low percent of fruit from infected trees.
Fruit from infected Valor trees were most severely damaged.
The intensity of fruit symptoms increased with age of tree but also greatly depended on weather conditions.
More severe symptoms were always connected with dry, hot summer.
The virus had spread most readily among the trees of Valor, Amers and Empress cvs.
The virus inhibited tree growth.

VI International Symposium on Plum and Prune Genetics, Breeding, Pomology

B. Zawadzka, E. Rozpara, Z. Grzyb

https://doi.org/10.17660/ActaHortic.1998.478.10