القدرة الإمراضية للفطر المسبب لمرض التبقع السبتوري (Mycosphaerella graminicola)‎ على نوعي القمح الصلب و الطري باستخدام لقاح معد من مصادر مختلفة

Abstract EN

Septoria tritici blotch apparently does not attack durum wheat (Triticum turgidum ssp.

durum) and bread wheat (T.

aestivum) equally.

Thirty five cultivars, 14 durum and 21 bread wheat, were used in pathogenicity tests to investigate this phenomenon.

The inoculum was comprised of a bulk of blastospores produced from pycnidiospores grown on artificial medium.

Inocula used originated from bread wheat, durum wheat, or a mixture of both.

Field tests on adult plants and seedling test in the green house were carried out at Tel Hadya/Aleppo.

Data from adult plants showed that inoculum from durum wheat scored an average disease development of 6 on the durum wheat cultivars and 3 on bread wheat cultivars.

Disease development on bread wheat and durum wheat culti¬vars was 6 when using inoculum from bread wheat or a mixture inoculum from bread wheat and durum wheat.

In seedling tests, pycnidial formation was greatest in both durum and bread wheat cultivars when the source of the inoculum ms from the same species.

Pycnidial formation is therefore a better criterion to express disease development on different boa species.

This phenomenon has been categorized as a hem preference of the pathogen causing septoria tritici blotch.

Californian bread wheat lines and cultivars tested were resis¬tant to the isolates used in this study and therefore comprise a valuable source of resistance to septoria tritici blotch in Syria.