Expression of disease symptoms on different apple cultivars infected with apple proliferation phytoplasmaLešnik, Mario (Avtor) Ravnikar, Maja (Avtor) Brzin, Jernej (Avtor) Mehle, Nataša (Avtor) Petrovič, Nataša (Avtor) Tojnko, Stanislav (Avtor) Lešnik, Mojca (Avtor) apple proliferation phytoplasmaappledisease symptom expressionAn expression of Apple proliferation (AP) symptoms in the infected young apple trees of 7 cultivars was studied. Two types of symptoms were observed in infected trees; AP specific (changes in size and number of leaf stipules and witches-broom formation) and non-specific symptoms (changes in leaf size, shape and colour, formation of rosettes and stunting of shoots). The percentage of infected trees that expressed one or more AP-specific symptoms was 18.9-75.5 % in one-year old trees, 39,4-87 % in two-year, and 44,8-89,7 % in three-year old trees. The expression of non-specific symptoms was similar (43,2-65,3 % in one-year, 57,6-85,2 % in two-year and 62,1-87,5 % in three year old trees).Inštitut za hmeljarstvo in pivovarstvo20072015-07-10 18:27:14Delo ni kategorizirano52829sl