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Updated: Jun 10, 2026

An Effective Inoculation Method for Phytophthora capsici on Black Pepper Plants
Published on: September 16, 2022
Antifungal activity of the osthol derivative JS-B against Phytophthora capsici
Chun-Mei Wang1, Wei Guan, Shu Fang
1Food Safety Research and Service Institute, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Abstract:
JS-B (C(12)H(10)O(3)) is a derivative compound of osthol. The antifungal properties of JS-B were tested against 10 economically important plant pathogens. JS-B was effective in inhibiting the mycelial growth of Phytophthora capsici, and its inhibition on different stages of the life cycle of P. capsici was observed. The 50% effective concentration (EC(50)) of JS-B on mycelial dry weight and zoospore germination of P. capsici was 43.74 and 86.03 microg/ml, respectively. The rupture of released zoospores induced by JS-B was reduced by the addition of 100 mM glucose. The ultrastructural study showed that JS-B caused destruction of most of the mitochondrions, the concentration of cell nuclear, and the existing vesicles. When compared with dimethomorph, the activity of JS-B on P. capsici was determined under pot conditions. The result showed that JS-B has a curative effect on pepper blight.
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