TY - JOUR T1 - Scientific Opinion: Improving the Definition of Grape Phylloxera Biotypes and Standardizing Biotype Screening Protocols JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 371 LP - 376 DO - 10.5344/ajev.2016.15106 VL - 67 IS - 4 AU - Astrid Forneck AU - Kevin S. Powell AU - M. Andrew Walker Y1 - 2016/10/01 UR - http://www.ajevonline.org/content/67/4/371.abstract N2 - Grape phylloxera biotypes are defined by their specific performance on, or preference for, a particular host (e.g., feeding on a particular rootstock). Numerous studies have phenotyped phylloxera biotypes, particularly with regard to their performance on various hosts, but the results are difficult to compare because there is neither a homogenous nomenclature nor a standardized protocol for phenotyping. To improve communication within the scientific community, we offer a simplified phylloxera biotype classification to allow clear data interpretation and effective communication. We also introduce the standard techniques employed for phylloxera phenotyping and discuss their advantages and disadvantages. ER -