تقصي مسبب مرض الريزومانيا (BNYVV)‎ على الشوندر السكري و أداء أصناف وحيدة الجنين تجاه هذا المرض في سورية

الملخص EN

A survey for sugar beet diseases with special emphasis on rhizomania was conducted during 1996-1998.

A total of 2019 samples were collected from 290 fields in Homs, Aleppo and Hama governorates and were tested for the presence of beet necrotic yellow vein virus (BNYVV) by DAS-ELISA.

Results indicated that rhizomania is a wide-spread and devastating viral disease of sugar beet in Syria, especially in Qsair region (Homs), where infection was found in 79.4% of the investigated fields, with an average disease incidence (ADI) of 44%.

Similar results were obtained from Aleppo governorate, where BNYVV infection was recorded in 76.4% of sugar beet fields investigated, with an ADI of 40.9%.

However, the proportion of infested fields in Hama governorate reached 15.8%, with an ADI of 16.7%.

A study of the etiology of the disease complex showed that numerous biotic factors such as BNYVV, H.

schachtii and F.

oxysporum f.sp.

betae contribute to the hairy root and wilt syndrome.

The disease losses due to rhizomania were severe, the average yield loss was 24.8 fold higher with a sugar content reduction of 5.0-58.3%.

The reaction of 11 monoembryonic sugar beet cultivars to rhizomania infection at high disease pressure (Al-Nezaria region) revealed that Del 954, Porto, Gabrielo and Rizor were the most tolerant cultivars, with an ADI from 62.9 to 100%.