However, due to the harmful effects on the environment because of the use of fungicide (Ozkara et al. 2018).įungicides are one of the principal tools for managing cucumber powdery mildew (Lebeda et al. It is a major foliar disease worldwide, reducing crop quality and yield (Rur et al. Braun & Shishkoff (formerly Sphaerotheca fuliginea (Schlechend.: Fr) Pollacci). Powdery mildew is caused by Podosphaera xanthii (Castagne) U. Additionally, treated cucumber plants showed a significant increase in plant growth parameters (plant height, total chlorophyll, fresh, and dry weight) and yield parameters (fruit number/plant and fruit weight/plant) as well the activity of defense-related enzymes, i.e., peroxidase (PO) and polyphenol oxidase (PPO), and total phenols content (TPC) compared to the untreated plants.Ĭucumber ( Cucumis sativus L.) is one of the most widely grown greenhouse crops. subtilis significantly decreased disease severity percentage (67.33 and 65.38%, respectively) and AUDPC (322.84 and 342.06) than the untreated control (988.13 AUDPC). All treatments significantly decreased the disease severity and area under disease progress curve (AUDPC) post spraying the bio-agents on cucumber plants under greenhouse conditions. Also, score recorded the highest reduction percentage (97.19%). xanthii conidial germination in vitro the reduction percentage ranged between 91.17 and 76.06%. Results indicated that culture filtrate of the tested bio-agents and the fungicide (control) significantly reduced P. xanthii, in vitro and under greenhouse conditions. viride, Bacillus subtilis, Paenibacillus polymyxa, and Serratia marcescens, as well as the fungicide score (Difenoconazole), on cucumber infected with P. This research study was conducted to evaluate the efficacy of the tested bio-agents, Trichoderma harzianum, T. Braun & Shishkoff severe disease-causing yield losses worldwide. Cucumber powdery mildew disease caused by Podosphaera xanthii (Castagne) U.
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