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Background Early blight disease of tomato caused by pathogenic fungi  Alternaria solani  is the most significant and common disease throughout the world as well as in Kingdom of Saudi Arabia. The aim of this study was to isolate and identify native  Trichoderma  species from the Jeddah region in Saudi Arabia; evaluate their antagonistic potential against  A. solani ; and study their influence early blight disease severity in greenhouse and in open field. Results The present study focused to explore the biocontrolling potential of native  Trichoderma  spp. against  A. solani  strain to compare with a conventional fungicide .  Out of 21, 3  Trichoderma  isolates showed an antifungal activity and significantly inhibited the mycelial growth of pathogen that were identified as  Trichoderma atroviride, T. harzianum  and  T. longibrachiatum  by their ITS region sequence analysis. Strong in vitro mycelial growth suppression (70.66%) was also recorded at 400 ppm Mancozeb (90%WP ® ) fungicide. Further, these  Trichoderma  bioagents and fungicide were further evaluated in greenhouse (artificially inoculated) and in field on naturally infected tomato plants. In greenhouse, (13.74%) disease severity after  T. harzianum  treatment was recorded, followed by  T. longibrachiatum  (25.83%) and  T. atroviride  (21.67%). The disease severity after fungicide (50 mg/L; 10 ml per plant) application was (7.91%). Further, positive impact on the plant biomarkers was demonstrated by all selected  Trichoderma  isolates in greenhouse. Under natural infection in season I, the disease severity (%) after  T. longibrachiatum ,  T. atroviride  and  T. harzianum  treatments was 11.5, 13.26 and 16.81%, respectively, followed by control (32.12%), whereas 7.18% disease severity was recorded after fungicide application. Conclusions The results revealed that native  Trichoderma  of this region had potential to mitigate the early blight disease intensity in field.

egyptian journal of biological pest control

Screening and biocontrol evaluation of indigenous native Trichoderma spp. against early blight disease and their field assessment to alleviate natural infection