General Commission for Scientific Agricultural Research-
Suweida Research Center
Damascus University, Faculty of Agriculture
Grape vine phylloxera “Dakttulosphaira vitifolia” is one of the most important and dangerous pests which infect grapevine in most of grapevine cultivated area.
Survey of this insect in Suwieda province was conducted. This insect prevails in the main grapevine cultivated area, in the first region and in the villages close to Deraa province.
Five local varieties Aswad Sharar, Aswad Anony, Qalp Altair, Opaidi and Qasofi were studied. The tolerance of these varieties was evaluated compared with. Helwani cv. as a control. Aswad Sharar was the most tolerant variety compared with others and with the control.
The ability of this insect to infect species other than grapevine was studied .No hosts other than grapevine was found. The insect infects the roots of v. vinifera.
Aside study of the biology of this insect was done. Generally, the insect enters winter stage at the end of November, and the beginning of December. It winters as nymph from the second instar. It begins to move in March according to the soil temperature.
The outbreak of the colonies of phylloxera appears in April and from the beginning of June up to the end of August. The best diameter of roots to lay eggs is 3-5 cm.
The effect of Oxtoxeen pesticide was evaluated. The percentage of death was 91.6%, but it couldn’t terminate the whole colonies. The pesticide affected the adults and nymphs, but it couldn’t affect the eggs.