Which plant disease causes leaves to have dark red blisters?

The disease that causes leaves to develop dark red blisters is indeed common rust, particularly in plants such as corn. Common rust is caused by the fungus Puccinia sorghi, which predominantly affects maize (corn). The visible symptoms include the characteristic blister-like structures on the leaves that appear as dark red or rust-colored lesions.

These blisters are pustules filled with spores and can be easily identified when inspecting the leaves. As the disease progresses, these pustules rupture, leading to further dispersal of spores which can infect other plants, exacerbating the spread of the disease within a crop. The distinct appearance of these lesions is a key diagnostic feature, making common rust easily recognizable to those familiar with corn diseases. This is why the correct identification of this disease as causing dark red blisters is particularly important for effective pest management strategies.

The other diseases mentioned have different symptoms. For example, corn gray leaf spot is characterized by elongated lesions with grayish centers and dark edges rather than blisters, fusarium root rot leads to root decay without blisters on the leaves, and septoria brown spot manifests as small, dark spots on leaves, neither of which resemble the described blisters. Understanding these distinctions is crucial for accurate diagnosis and management in crop