Population Trends of Grape Phylloxera, Daktulospharia (Vites) vitifoliae Fitch. (Homoptera: Phylloxeridae) and Effect of Two Insecticides on Its Different Stages in Jordan

Population dynamics of root form of grape phylloxera, Daktulospharia (Vites) vitifoliae Fitch. (Homoptera: Phylloxeridae ) were carried out in the field in 2004. Mean number of eggs, nymphs and adults showed peaks in mid-July and early August, respectively. All stages disappeared in late August. There were no galls noticed on the examined roots throughout this study. Treatments included two insecticides, imidacloprid and thiamethoxam and control. The insecticides were applied to the foliage of the grape vine. Mean numbers of different stages of phylloxera were separately combined throughout the two foliar spray periods. There were no significant differences between treatments; thiamethoxam and imidacloprid although it did differ than the control. Mean number of eggs, nymphs, adults and colonies treated with imidacloprid insecticide was less than in thiamethoxam treatment, but without significant differences. Although there were no statistical differences between the effect of the two foliar insecticidal treatments on different yield parameters, greater number of bunches was obtained from thiamethoxam followed by imidacloprid and then control. Mean weight of bunch was highest in imidacloprid treatment followed by thiamethoxam and then control. Among total soluble solids, the highest value was in imidacloprid and the lowest in the control. Imidacloprid and thiamethoxam effectively reduced the number of different stages; eggs, nymphs, adults, colonies and could be recommended for the control of grape phylloxera