What is a leaf lesion?

A leaf lesion refers to an injury on a leaf that is typically caused by pathogens such as fungi, bacteria, or viruses. These lesions often manifest as spots, discoloration, or tissue death, indicating that the leaf is experiencing some form of stress or damage. Pathogens infect the plant tissue, leading to these observable changes, which can significantly affect the plant's health and its ability to photosynthesize.

Understanding leaf lesions is vital for pest management and plant health care, as they can be indicative of broader issues within a plant's environment or health. Identifying and addressing the cause of these lesions can prevent further damage and promote recovery. This knowledge is crucial for those in the pesticide certification field, as it helps in making informed decisions about treatment options and strategies for disease management.