按北卡罗来纳的甘薯改良计划,已对有希望杂交种的栓心病毒(ICV)抗性进行了评价。为了在生长期间给可能的传毒媒介造成经常性的感染源,杂交选系种子已染 ICV 的易感病品种“波多黎各”(Porto Rico)的行间。这种带病毒原种的块根,最早是1958年春从前一季的块根中选择的,后者贮藏在约25℃的条件下以诱发薯心坏死。只用带薯心坏死症状的块根 In accordance with the Sweet Potato Improvement Program in North Carolina, resistance to the core plug virus (ICV) of promising hybrids has been evaluated. In order to generate a regular source of infection for possible vectors during growth, the cross was crossed between lines of Porto Rico, a susceptible strain of ICV that has been infected with the seed. The root of this virulent stock was selected from the roots of the previous season as early as the spring of 1958, which was stored at about 25 ° C to induce tubercle necrosis. Use only roots with symptoms of tuberous necrosis