Dimethomorph is a morpholine fungicide belonging to the fungicide group of sterol biosynthesis inhibitors that inhibits fungal cell wall formation. Dimethomorph inhibits mycelial growth of the oomycete fungi, P. citrophthora, P. parasitica, P. capsici, and P. infestans ( EC 50 s=0.1, 0.38, <0.1, and 0.16-0.3 μg/mL, respectively), but is less active against the green algae species C. vulgaris or S. obliquus in vitro (EC 50 s=47.46 and 44.87 μg/mL, respectively). Dimethomorph inhibits androgen receptor (AR) activity in a reporter assay in MDA-kb2 human breast cancer cells but not in a yeast antiandrogen screen ( IC 20 s=0.263 and 38.5 μM, respectively).