Does he have a bad odor from his beak? It is possible that he has canker, but there can be yellow plaques from viruses, fungus, or bacteria as well. Canker smells bad from what others have said. It is treated with Fish Zole (Metronidazole) 250mg daily for 5
Avian trichomonosis (also known as trichomoniasis, and commonly referred to as 'canker' or 'frounce') is an infectious disease of birds caused by the flagellate protozoan parasite Trichomonas gallinae. The disease is extremely common in domestic and wild pigeons and doves (approximately 80-90%...