What is typically the main symptom of necrosis in plants?

The main symptom of necrosis in plants is typically browning of leaf tips. Necrosis refers to the localized death of plant tissues, which often manifests as a brown, dead area on the leaves. The browning occurs due to cell collapse and death, often accompanied by the loss of chlorophyll, which gives healthy leaves their green color. As the tissue dies, it can lead to a more extensive browning that may progress further into the leaf.

In contrast, curling of leaves, wilting of stems, and yellowing of foliage may indicate other physiological responses or stress factors, such as water stress, nutrient deficiencies, or pest damage, but they do not directly signify necrotic tissue. Necrosis is more specific to the death of plant cells, which is clearly represented by the browning associated with leaf tips. Recognizing this symptom is crucial for diagnosing plant health issues and determining the appropriate interventions.