Close-up of a leaf affected by fungal disease, showcasing clusters of spores on a green leaf surface, illustrating common plant diseases.

Diagnosing Common Plant Diseases

Last Updated May 05, 2026 Plant disease diagnosis usually fails before any treatment starts. Gardeners see a spotted leaf, assume infection, then spray for the wrong problem. The same yellowing, wilting, browning, or leaf drop can come from fungi, bacteria, viruses, waterlogged roots, heat, chemical drift, or simple physical damage. Good plant disease identification reads…

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