C. trifolii may refer to:
- Coleophora trifolii, the trefoil thick-horned tinea or large clover case-bearer, a moth species found in Europe, North Africa, Asia Minor, Afghanistan and North America
- Colletotrichum trifolii, a fungal plant pathogen of alfalfa
- Curvularia trifolii, a plant pathogen
- Cymadothea trifolii, a fungal plant pathogen
If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: