Fig. 3.

Antifungal activity of cytochalasin H (6), phomoxantone A (3), phomoxantone B (4), and paecilin Q (1) (10 mg/mL) against the phyto-pathogen Phyllosticta citricarpa. I a–f Evaluation of mycelial growth, II a–f development of pycnidia in citrus leaves, III a–f citrus black spot (CBS) lesions in detached fruits. a Control with methanol, b treatment with carbendazim. Treatment with compounds: c cytochalasin H (6), d phomoxantone A (3), e phomoxantone B (4), and f paecilin Q (1). Red arrow (II): pycnidia of P. citricarpa, black arrow (III): necrotic zone, white arrow (III): fungal growth. – Scale bars: I = 10 mm, II = 3 mm, III = 5 mm. For antifungal activities of the remaining compounds (2, 5, 7–10), see Fig. 4S, Supporting Information)