Abstract: Grape phylloxera, Daktulosphaira vitifoliae Fitch., is a destruetive insect on cultivated grapes. It has reoccurred in some provinces since 2005. In order to understand grape phylloxera’s population dynamics in one year cycle, we investigated it in the vineyards of Xi’an and Shanghai. The results showed
that grape phylloxera’s life cycle was mainly asexual portions with types that feed on root galls, and reproduced exclusively by clonal. Some grape phylloxera arose alternation of generation from August to October, a few winged-bearing nymphs was observed, but the winged adult insects was not found in the field.
At July and October the population reached peaks respectively, then declined and began to dormancy from November. Overwinter population was in small numbers by frst instar hibernants since November. As groundtemperatures increased to about 13.0 ℃ in the spring, it terminated dormancy, larvaes began to feed and transformed into adults after some ecdysis，then was in parthenogenesis.

Key words: grape, Daktulosphaira vitifoliae, parthenogenesis, population dynamics, vertical distribution, nodosity