Survey of infection by Citrus tristeza virus on citrus variety in Tartous governorate Syria

A survey of infection by Citrus tristeza virus (CTV) was conducted during a visit to 14 citrus orchards in different regions in Tartous governorate in the Syrian Coast during the spring of 2012. We collected a total of /691/ samples of different varieties. Most of the samples were collected from plants with symptoms similar to symptoms caused by viral diseases (dwarfing, yellowing, mosaic, quick- decline, vein clearing, boat or spoon-shaped leaves), while other samples did not carry such symptoms due to the possible presence of latent infections. The samples were tested by using Tissue Blot immunoassay (TBIA). The Results showed that the rate of infection by CTV was 34.15% in the tested samples and the distribution of CTV in citrus orchards was by various ratios. The highest percentage of infection was detected in AL- Hamidiah (62.50%), whereas the lowest infection percentage detected was in Talin nursery (10%). Common orange Balady was the most infected by Citrus tristeza virus (41.43%). No virus infection was recorded in Mandalina samples.

Effect Citrus trestiza virus infection in Growth of Balady common orange and Satsuma trees grafted on sour orange

Effect of Citrus trestiza virus (CTV) in Growth of Balady common orange and Satsuma trees grafted on sour orange Rootstock in Hraisoon during 2013 was studied. The results showed that of infection by CTV caused deformation of shaped leaves, boat or spoon-shaped leaves. The symptoms was greater in Satsuma from Balady common orange trees. Also leaf size average of Balady common orange trees reduced from 15.58 cm2 in healthy trees to 11.82 cm2 in infection trees as percentage 24.13, and from 19.64 cm2 in healthy Satsuma trees to 12.38 cm2 in infection trees as percentage 36.97. and length average of spring, summery and autumnal fresh foliages growths was reduced from 20.98 cm, 14.62 cm, 12.17cm in healthy Balady common orange trees to18.75cm, 12.52cm, 9.32 cm in infection trees respectively. Also it reduced from 18.78 cm, 14.56 cm, 10.06 cm in healthy Satsuma trees to 13.78 cm, 9.34 cm, 6.03 cm in infection trees respectively, the CTV had no significant effect on Trunk circumference in both varieties.