Abstract :
The cultivars of some grapevines (Vitis vinifera L.) varieties, King Robi, Rebier, Flame Seedless, Thompson Seedless and Bez El-Anza were cultivated at El- Salheia, Province El. Sharkia Govern- orate, during the season 2010. These varieties were tested under laboratory conditions to study their relative susceptibility to the infestation of Tetranychus urticae Koch at 25 ± 5°C and 75+ 5 % R.H.King Robi variety was the most susceptible variety while Bez El-ElAnza., variety was the less susceptible one. On the other hand, Rebier, Flame Seedless and Thompson Seedless have moderate susceptibility. The highest number of eggs was noticed on King Robe variety young leaves (18.35 eggs).
