Identify plant diseases quickly with clear symptoms, photos, and solutions to protect your garden from damage.
Sooty Mold is a fungus that grows on honeydew (excrement of sucking insects like aphids), forming a dark, velvety, soot-like film over leaves and stems, which blocks sunlight for photosynthesis, stunts growth, and detracts significantly from plant appearance.
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Black Spot, a common fungal disease of roses, appears as distinct, circular black spots with fringed margins primarily on upper leaf surfaces, causing leaf yellowing and premature defoliation, which weakens the plant and reduces flowering and aesthetic value.
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Apple Scab, caused by the fungus Venturia inaequalis, manifests as dark, olive-green, velvety spots on leaves, which later turn black and scabby on fruit, leading to premature leaf drop, reduced fruit quality and marketability, and severe yield reduction.
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Cyst Nematodes are microscopic parasitic worms that attack roots, causing stunting, yellowing, wilting, and reduced plant vigor, with their tiny, lemon-shaped cysts visible on roots, ultimately leading to severe crop yield losses in fields.
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Crown Gall, caused by Agrobacterium tumefaciens, produces rough, tumor-like swellings (galls) usually at the plant's crown (soil line), but also on roots and stems, which obstruct water/nutrient flow, stunt growth, and can eventually kill the plant.
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Bacterial Soft Rot causes soft, mushy, and foul-smelling decay in fleshy plant tissues like roots, tubers, and fruits, resulting in complete destruction of the harvested product and significant post-harvest economic loss.
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Fire Blight, a bacterial disease, causes blighted, blackened, or scorched-looking shoots and flowers (resembling fire damage) and cankers on branches, leading to branch dieback, general plant decline, and significant loss of fruit crops like apples and pears.
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Chemical injury in plants appears as scorching, browning, or distorted growth on leaves and stems, caused by improper pesticide or fertilizer application. This reduces aesthetic value and crop yield.
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Temperature Stress (Heat/Cold) causes wilting, scorched or bleached leaves (heat), or purpling, browning, and stunted growth (cold). The main harm is disrupted metabolism and cell damage, leading to reduced yield, flower drop, or plant death.
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