VIRUSES AND VIRUS-LIKE DISEASES OF WOODY-PLANTS IN HUNGARY

In Hungary investigations on the virus diseases of woody plants, inclu ding grapevine, fruit trees, forest trees and shrubs began to come int o prominence relatively late, in the 1960s. To our best knowledge the grapevine is infected by eight nepoviruses, four air-borne viruses and three so far not exactly identified viruses. In the fruit trees of Hu ngary 19 virus- and 3 mycoplasma diseases are known, of which seven vi ruses are properly characterized. From 21 forest tree species and shru bs 13 viruses have been exactly identified, while in the case of 18 vi rus infected plants the pathogens have not been identified, or their i dentification is in process.