Özet:

In this study, the effects of Salicylic Acid (SA) and DL-β-amino-n-butyric Acid (BABA) on Phytophthora blight caused by Phytophthora capsici were investigated. SA completely inhibited the mycelial growth of P. capsici at 250ppm concentration in vitro. In the pot experiments, the applications of soil and leaves of SA reduced the disease severity of P. capsici with 75.1-92.2% and 87.2-95.0%, respectively. In the both greenhouse and field conditions, the effects of SA on the disease severity of P. capsici were 68.9 and 62.0% at 1g/m2 dose of soil drench, 61.6% at 500ppm and 50.2% at 1000ppm of leaves sprays, respectively. BABA had no effect on mycelial growth of P. capsici up to 1000ppm concentrations in vitro. However, in the pot experiments, the applications of soil and leaves of BABA reduced the disease severity of P. capsici with 60.1-84.3% and 83.6-97.2%, respectively. In the both greenhouse and field conditions, the effects of BABA on the disease severity of P. capsici were 70.5 and 49.0% at 1g/m2dose of soil drench, 63.4% at 500ppm and 46.4% at 2000ppm of leaves sprays, respectively. The applications of leaves with 1000ppm of SA and 2000ppm of BABA increased the capsidiol level in pepper plants

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