مسح حقلي لمرض النقطة السوداء (Colletotrichum coccodes (Wallr.)‎ Hughes)‎ على البطاطا البطاطس في وسط و شمال سورية

الملخص EN

Field survey of black dot disease (Colletotrichum coccodes) was carried out in the major potato growing areas, during flowering stage in Aleppo, Idlib and Hama provinces in Syria.

The survey covered 291 fields in 2009 spring sowing, 213 fields in 2009 autumn sowing and 320 fields grown with different varieties in 2010 spring sowing.

Prevalence, incidence and severity of the disease were calculated in the different fields surveyed and on different varieties.

Results showed that disease prevalence varied among areas surveyed, except Efrin (Aleppo) and Al-Samra (Hama) where no infections were detected.

The highest prevalence (35.5%) was found in 2010 Spring sowing in Idlib province, and the lowest (15%) was at the 2009 Spring sowing in Aleppo.

The highest incidence and severity were found in Khan Sheikhoon in Idlib (26.2%, 23.4%, respectively), and the lowest were in Ezaz/Aleppo (2.4%, 2%, respectively).

Results also showed that all varieties were susceptible to black dot disease, and significant differences in incidence and severity were reported on the different varieties tested.

The most susceptible cultivar was Agria.