STM Article Repository

This work aims to demonstrate the pathogenicity of 37 isolates of Fusarium species and 4 isolates of Bipolaris sorokiniana on durum wheat (Karim and Amjad varieties), soft wheat (Wafia and Amal varieties) and barley (Hordeum pusillum and Hordeum escourgeon).All isolates induced root necrosis in inoculated wheat and barley plants. Isolates F10 (F. solani), F21, F24, F25 (F. graminearum), F27, F28, F29 (F. culmorum) and F34 (F. solani) are the most pathogenic on tested wheat varieties (hard and soft). Similarly, isolates F9 (F. solani), F22, F26 (F. graminearum), F29 (F. culmorum) and F34 (F. solani) are the most pathogenic on barley. F. solani and F. oxysporum, mentioned as secondary parasites or simple saprophytes or having a very reduced aggressiveness on wheat and barley, induced in these two cereals class 4 of severity, incidences and indices of the disease very high and therefore can be considered as responsible pathogens for root rot. The isolates of Bipolaris sorokiniana are also pathogenic on wheat and barley, but their pathogenicity is lower than that induced by the studied isolates of Fusarium species. Isolates H4 and H3 could induce a percentage of the S4 severity class in the order of 25% on the plants of the variety Wafia (wheat) and Amjad (durum wheat). The highest percentages of S4 class in barley, Escourgeon and Pisillum, did not exceed 16.7% and were induced by isolate H1. This study also allowed discussing the importance of each pathogen to induce disease in wheat and barley.