番木瓜环斑病毒(PRV)在遍及热带和亚热带果树——番木瓜(carica papa-ya L.)上引起一种最严重的番木瓜病害。本研究的目的是寻找和诱发一个或若干个可能用于交互保护防治 PRV 的弱毒株。材料与方法田间采集:获得 PRV 弱毒株的第一个企图是在夏威夷岛一个严重感染的番木瓜园从症状最轻的番木瓜树上选择自然发生的分离株。收集的116个分离株在温室中被机械 Papaya ringspot virus (PRV) causes one of the most serious papaya diseases throughout the tropical and subtropical fruit tree, carica papa-ya L. The purpose of this study is to find and induce one or several attenuated strains that may be used to interactively protect against PRV. MATERIALS AND METHODS Field collection: The first attempt to obtain a virulent strain of PRV was to select naturally occurring isolates from the lightest papaya tree in a heavily infected papaya plantation on Hawaii Island. The 116 isolates collected were mechanically in a greenhouse