TY - JOUR T1 - Evaluation of Grape Rootstocks for Resistance to Type A and Type B Grape Phylloxera JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 298 LP - 300 DO - 10.5344/ajev.1987.38.4.298 VL - 38 IS - 4 AU - J. Granett AU - A. C. Goheen AU - L. A. Lider AU - J. J. White Y1 - 1987/01/01 UR - http://www.ajevonline.org/content/38/4/298.abstract N2 - Grape rootstocks were tested for resistance to California Type A and Type B phylloxera in the laboratory and Type B phylloxera in an infested vineyard trial. The laboratory evaluations indicated that some rootstocks with partial Vitis vinifera parentage had resistance to both biotypes; others did not. Rootstocks with no V. vinifera parentage were resistant or immune to both biotypes. Field trials appear to substantiate laboratory screening results. The best levels of resistance in field trials appear to be in cultivars SO4, O39-16, and O44-4. ER -