What is a leaf lesion?

A leaf lesion refers to an area of injury or damage on a leaf that is typically caused by pathogens, such as bacteria, fungi, or viruses. This injury manifests as visible spots, discoloration, or decay on the leaf surface. Understanding leaf lesions is crucial for diagnosing plant diseases and determining appropriate treatment methods. Identifying these patterns can help in implementing disease management strategies to protect the health of the plant.

In contrast, beneficial insects are organisms that contribute positively to the ecosystem by controlling pest populations or pollinating plants. Fertilizers are substances added to soil or plants to supply essential nutrients, and weeds are unwanted plants that compete with desired vegetation for resources. None of these options relates directly to the concept of leaf lesions as they do not involve injury or disease processes affecting the foliage of plants.