Puccinia striiformis is a fungal pathogen that primarily affects wheat and other cereal crops. It is responsible for wheat yellow rust, a disease that can significantly reduce crop yields. The fungus thrives in cool, moist conditions and spreads through wind-borne spores, making it a concern for farmers worldwide. The life cycle of Puccinia striiformis includes several stages, with the production of yellow-orange spores on infected plants. These spores can infect new hosts, leading to further spread of the disease. Effective management strategies include resistant crop varieties and fungicide applications to control outbreaks.