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necrosis (adj. necrotic)  : death of cells or tissue, usually accompanied by black or brown darkening (necrosis caused by downy mildew on a grape leaf)

necrosis (adj. necrotic) : death of cells or tissue, usually accompanied by black or brown darkening (necrosis caused by downy mildew on a grape leaf)

yellows: disease characterized by chlorosis and stunting of the host plant (aster yellows phytoplasma infection in romaine lettuce)

yellows: disease characterized by chlorosis and stunting of the host plant (aster yellows phytoplasma infection in romaine lettuce)

vein banding: symptom of virus disease in which regions along veins are either darker green or distinctly more yellow than tissue between veins (vein banding symptom of common bean mosaic virus in bean)

vein banding: symptom of virus disease in which regions along veins are either darker green or distinctly more yellow than tissue between veins (vein banding symptom of common bean mosaic virus in bean)

sign: indication of disease from direct observation of a pathogen or its parts (see symptom) (pycnidia of Leptosphaeria maculans in a blackleg lesion on a canola leaf)

sign: indication of disease from direct observation of a pathogen or its parts (see symptom) (pycnidia of Leptosphaeria maculans in a blackleg lesion on a canola leaf)

enation:    abnormal outgrowth from the surface of a stem or leaf (grape)

enation: abnormal outgrowth from the surface of a stem or leaf (grape)

lesion  :  localized diseased area or wound (poinsettia scab lesions caused by Sphaceloma poinsettiae)

lesion : localized diseased area or wound (poinsettia scab lesions caused by Sphaceloma poinsettiae)

scorch: any symptom that suggests the action of flame or fire on the affected part, often seen at the margins of leaves (grape infected by Xyllela fastidiosa, a xylem-limited fastidious bacterium)

scorch: any symptom that suggests the action of flame or fire on the affected part, often seen at the margins of leaves (grape infected by Xyllela fastidiosa, a xylem-limited fastidious bacterium)

powdery mildew: a white, powdery, superficial ascomycetous fungus that is an obligate parasite and generally is found only on one or a few closely related species of plants

mildew : thin coating of mycelial growth and spores on the surfaces of infected plant parts (powdery mildew on a leaf)

defoliation:    loss of leaves from a plant, whether normal or premature (defoliation of citrus with citrus canker)

defoliation: loss of leaves from a plant, whether normal or premature (defoliation of citrus with citrus canker)

wilt: drooping of leaves and stems from lack of water (inadequate water supply or excessive transpiration); vascular disease that interrupts normal water uptake (wilted tobacco)

wilt: drooping of leaves and stems from lack of water (inadequate water supply or excessive transpiration); vascular disease that interrupts normal water uptake (wilted tobacco)

mosaic: disease symptom characterized by non-uniform coloration, with intermingled normal, light green and yellowish patches, usually caused by a virus; often used interchangeably with mottle (mosaic on tobacco plant infected by tobacco mosaic virus)

mosaic: disease symptom characterized by non-uniform coloration, with intermingled normal, light green and yellowish patches, usually caused by a virus; often used interchangeably with mottle (mosaic on tobacco plant infected by tobacco mosaic virus)

rosette: disease symptom characterized by short, bunchy growth habit due to shortened internodes and no comparable reduction in leaf size (chlorotic rosette symptom in peanut caused by the groundnut rosette virus)

rosette: disease symptom characterized by short, bunchy growth habit due to shortened internodes and no comparable reduction in leaf size (chlorotic rosette symptom in peanut caused by the groundnut rosette virus)

downy mildew   : a plant disease in which the fungus appears as a downy growth on the host surface; caused by a member of the Oomycetes (Plasmopara viticola on underside of a grape leaf)

downy mildew : a plant disease in which the fungus appears as a downy growth on the host surface; caused by a member of the Oomycetes (Plasmopara viticola on underside of a grape leaf)

mottle   : disease symptom comprising light and dark areas in an irregular pattern, usually caused by a virus; often used interchangeably with mosaic (mottling of black raspberry leaves with raspberry mosaic disease)

mottle : disease symptom comprising light and dark areas in an irregular pattern, usually caused by a virus; often used interchangeably with mosaic (mottling of black raspberry leaves with raspberry mosaic disease)

water-soaked: describing disease symptom of plants or lesions that appear wet, dark, and usually sunken and translucent (bacterial fruit blotch of watermelon)

water-soaked: describing disease symptom of plants or lesions that appear wet, dark, and usually sunken and translucent (bacterial fruit blotch of watermelon)

gummosis (pl. gummoses)  : pathologic condition characterized by excessive formation of gums; the products of cell degeneration (Phytophthora cactorum infection resulting in gummosis in a citrus tree)

gummoses) : pathologic condition characterized by excessive formation of gums; the products of cell degeneration (Phytophthora cactorum infection resulting in gummosis in a citrus tree)

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