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以往的工作证实了葡萄种间对寄生性线虫Ｘ．ｉｎｄｅｘ的抗性存在着变异性．根据这些资料，在一些抗性的和敏感的葡萄种和栽培品种间进行杂交．依据根的明显症状评定每杂交组合的杂种后代的抗性．这些后代中观察到的分离类型认为对Ｘ．ｉｎｄｅｘ的抗性有两种推测的遗传模式。最简单的模式包含有一个显性抗性基因。在另一个模式里，抗性受两个基因支配，一个为显性的，另一个为隐性的，两者都能制约抗性。本文提出了进一步阐明对Ｘ．ｉｎｄｅｘ抗性基础的研究，并讨论了这些研究对葡萄育种程序的关系。 在加利福尼亚葡萄园里线虫成了主要的害虫，在几种为害葡萄的线虫中，为害最严重的就是Ｘ．ｉｎｄｅｘ，它不仅严重为害葡萄根部，而且也是葡萄扇叶病毒的传播介质。 目前，仅有的有效防治．措施是休闲土地或土壤熏蒸。由于线虫存留在土壤中的残根上，所以土地休闲期必须长达十年。土壤熏蒸是有效的，但成本太大，并受到日益增多的规章的限制。对种植者来说，一长期地休闲土地和昂贵的化学熏蒸剂从经济上看对他们的吸引力都不大，并且两种方法也都只能暂时地解决问题． 在栽培品种中遗传抗性对这种线虫／病毒复合体并非普遍有效．在加利福尼亚使用最广泛的砧木除Ｃｏｕｄｅｒｃ １６１３外，都是高度敏?
Past work has confirmed the parasitic nematode X between grapevines. There is variability in index resistance. Based on these data, crosses were conducted between resistant and sensitive grapevines and cultivars. The resistance of the hybrid progeny of each cross combination is assessed based on the apparent symptoms of the root. The type of separation observed in these offspring is considered to be X. There are two speculative genetic patterns for index resistance. The simplest model contains a dominant resistance gene. In another model, resistance is governed by two genes, one dominant and one recessive, both of which constrain resistance. This paper presents further clarification of X. index resistant studies and discussed the relationship of these studies to grape breeding programs. Nematodes are the major pests in California vineyards, and among several nematodes that harm grapes is X. It not only seriously damages the root of grape, but also the transmission medium of grapevine leaf virus. At present, the only effective prevention and treatment. Measures are leisure land or soil fumigation. Due to the nematodes that remain on the soil’s residual roots, the land must be recreated for up to ten years. Soil fumigation is effective, but costly and subject to increasing regulations. For growers, long-term recreational land and expensive chemical fumigants are not economically attractive to them and both methods are only temporary solutions. Genetic resistance in cultivars is not generally effective against this nematode / viral complex. The most widely used rootstock in California is hypersensitive except Couderc 1613?