STUDY OF SYMPTOMS VARIABILITY AFTER ARTIFICIAL INOCULATION BY PHYTOPLASMA ESFY IN DIFFERENT PRUNUS SPECIES

T. Nečas, V. Mašková, B. Krška
The visual symptoms displayed by 14 apricot trees and 1 peach cultivar (‘Jantze’) were monitored during the years 2004-2009. The primary symptoms of ESFY – chlorotic leaf roll – were recorded in 98% of combinations using the peach cultivar ‘Jantze’, compared to 58% for the apricot cultivar ‘Poljus Južnyj’ and 34% for cultivar ‘Hargrand_2’. All combinations using the rootstock ‘GF-8-1’ had symptoms of leaf yellowing, all with Torinel® had symptoms of leaf roll and reddening of the leaves, and all with GF305 had early leaf cast. Most distinctive symptomatic manifestation was observed in peach rootstocks Lesiberian and GF305, in which pronounced reddening of leaves and their precocious cast occurred during the growing season. Together with the reddening of leaves and their precocious cast, the GF305 rootstock showed leaf roll (80%), too. Symptoms were also observed after using buds taken from trees known to be ESFY positive but showing no obvious visual symptoms. In the case of infected buds taken from the cultivar ‘Poyer’, 55% of annual shoots showed no visual symptoms and in 36% symptoms of leaf roll were seen. Chlorotic leaf roll and leaf yellowing were significantly more common than early leaf cast or cases with no obvious symptoms (latent infection). The symptoms of infection by phytoplasma are often specific both in individual colonized botanical species and in cultivars of specific species.
Nečas, T., Mašková, V. and Krška, B. (2012). STUDY OF SYMPTOMS VARIABILITY AFTER ARTIFICIAL INOCULATION BY PHYTOPLASMA ESFY IN DIFFERENT PRUNUS SPECIES. Acta Hortic. 966, 123-129
DOI: 10.17660/ActaHortic.2012.966.19
https://doi.org/10.17660/ActaHortic.2012.966.19
phytoplasma, rootstocks, infection, Prunus, apricot, peach, PCR
English

Acta Horticulturae