Physiological mechanism beneath the inhibition of against the morphology and reproduction of .

is a soil-borne plant pathogen that can cause various plant diseases including cucumber wilt. An experiment was conducted to explore the physiological mechanism underlying the inhibitory activity of against the morphology and reproduction of . Different concentrations of extracts. -0 (Z0), 5 (Z5), 15 (Z15), 30 (Z30), 45 (Z45), and 60 (Z60) mg·mL were applied to . extract significantly reduced the colony diameter (89.7 %) and dry mass (78.9 %) of under the Z45 treatment. Moreover, spore formation was also significantly inhibited by extract. The spore number and germination rate decreased by 73.5 % and 83.0 %, respectively, under the Z45 treatment. The number of mycelia in the unit field of view was significantly reduced, and the mycelia were wizened with rough surfaces and more bends under the Z45 treatment. Hence, extracts severely damaged the morphology of mycelia. Additionally, could not adjust to the osmotic changes caused by extract, leading to membrane injury and electrolyte leakage. Finally, they impaired the antioxidant system in , resulting in cell membrane injury.