Abstract
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.
- Copyright 1987 by the American Society for Enology and Viticulture
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Vol 38 Issue 4
