ISHS Acta Horticulturae 130: XII International Symposium on Fruit Tree Virus Diseases
ELECTRON MICROSCOPY DETECTION OF APPLE RUBBERY WOOD PATHOGENS AND COBALTO-THERAPY OF INFECTED FRUIT TREES |
| Authors: | N. Minoiu, C. Craciun |
| Abstract:
Through electron-microscopy it has been proved, for the first time, that Apple rubbery wood (ARW) disease was caused by xylem limited bacteria. Morphologically, these bacteria looked very similar to Actinomycete-like bacteria and they also showed certain similitudes to Rickettsia-like bacteria. The bacteria were detected in one and two years old scions and also in the roots of the infected apple and pear trees. The ARW bacteria were partially eliminated from infected scions by irradiation with Co60. The best results were obtained when budsticks had been irradiated with 1 kr in March. After such a treatment, 52–55 % of the buds started a normal vegetative growth and 67–70 % of the obtained trees were bacteria-free. Apple chlorotic leaf spot (ACLS) and Pear vein yellows (PVY) viruses were not eliminated by cobalt irradiation but they showed milder symptoms when scions had previously been irradiated with 4–6 kr. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
