1980年，加州纳帕谷出现了一种基因突变的“同型小种B型”蚜虫。 这种蚜虫造成了估计60亿美元的损失，随后葡萄园开始了大规模连根拔除，烧毁并重新栽种于1995年完成。
A mutated “biotype B” insect emerged in Napa Valley in 1980 and did an estimated $6 billion of damage before wide-scale uprooting, burning and replanting was completed in 1995.
而生理小种内不同单孢分离系间没有RAPD谱型的差异，生理小种内的遗传基础相对一致。
The RAPD profiles of different single-spore isolations in each race were identical, so the inheritance background of single race was coherent.
研究病源物小种、株系、生物型的分化及抗性的差异反应以及抗性的鉴定技术和方法等。
SMV, SCN, insects, and physiological stresses e. g. drought, salt; to study technology of resistance characterization; to study genetics of germplasm with specific resistance, etc.
对照品种小偃6号反应型相对一致，只在E09小种中，检测到1个抗病单株，对其余四个白粉菌株，全部表现为感病。
While in the control cultivar, Xiaoyan6 performed similar reaction to powdery mildew. Only 1 line was resistance to E09 and all other lines were susceptible to other 4 powdery mildew.
对照品种小偃6号反应型相对一致，只在E09小种中，检测到1个抗病单株，对其余四个白粉菌株，全部表现为感病。
While in the control cultivar, Xiaoyan6 performed similar reaction to powdery mildew. Only 1 line was resistance to E09 and all other lines were susceptible to other 4 powdery mildew.
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