INCIDENCE OF SOME GRAFT-TRANSMISSIBLE DISEASES IN SOUTH AFRICAN POME FRUIT NURSERY MATERIAL

P.J. Meyer, D.J. Engelrecht
Randomly selected apple and pear nursery sources, propagated from visually inspected mother trees onto seedling rootstock, demostrated a high incidence of latent virus infections. On apple multiple infection with apple chlorotic leaf spot, apple stem grooving, apple flat limb, Spy 227 epinasty & decline, apple rubbery wood, platy-carpa scaly bark, platycarpa dwarf and apple mosaic were common. In pear multiple infections with pear ring pattern, pear vein yellows, apple rubbery wood and Spy 227 epinasty & decline were common. Pear rough bark and quince stunt were also detected. the erratic performance of some indicators suggests masking of disease symptoms under elevated field temperatures.
Meyer, P.J. and Engelrecht, D.J. (1976). INCIDENCE OF SOME GRAFT-TRANSMISSIBLE DISEASES IN SOUTH AFRICAN POME FRUIT NURSERY MATERIAL. Acta Hortic. 67, 336-336
DOI: 10.17660/ActaHortic.1976.67.55
https://doi.org/10.17660/ActaHortic.1976.67.55

Acta Horticulturae