What type of organism is Bremia sp. associated with?

Bremia sp. is specifically associated with downy mildew, which is a significant disease affecting lettuce. This pathogen thrives under cool, moist conditions and can severely impact lettuce crops, leading to economic losses for growers. The spores of Bremia can spread rapidly, especially in conditions that favor humidity, making it crucial for growers to implement proper management practices to mitigate its spread.

The other options refer to different diseases caused by distinct pathogens. Rust diseases, such as those affecting wheat, are caused by fungi from the Puccinia genus, while leaf spots in corn and Septoria leaf blight involve different organisms and environmental conditions. Understanding the specific association of Bremia sp. with downy mildew is essential for effective disease management in lettuce cultivation.