| changes in grape phylloxera abundance in ungrafted vineyards. | to examine seasonal changes in the abundance of grape phylloxera daktulosphaira vitifoliae (fitch), several sampling methods were tested at vineyards in victoria, australia. at a recently infested site, changes detected by root assessment, trunk trapping, and emergence trapping were closely correlated, although the largest numbers of grape phylloxera were obtained using traps that collected phylloxera emerging from soil. this trapping technique was further used to investigate changes in grape ph ... | 2006 | 17066812 |