| plant disease | | |
| n. (state) | 1. plant disease | a disease that affects plants. |
| ~ disease | an impairment of health or a condition of abnormal functioning. |
| ~ blight | any plant disease resulting in withering without rotting. |
| ~ leaf disease | any plant disease localized in the foliage. |
| ~ rust | a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi. |
| ~ blackheart | any of various diseases in which the central tissues blacken. |
| ~ black knot | disease of plum and cherry trees characterized by black excrescences on the branches. |
| ~ black rot | a fungous disease causing darkening and decay of the leaves of fruits and vegetables. |
| ~ black spot | any of several fungous diseases of plants that produce small black spots on the plant. |
| ~ bottom rot | fungous disease of lettuce that first rots lower leaves and spreads upward. |
| ~ brown rot | any of certain fungous diseases of plants characterized by browning and decay of tissues. |
| ~ gummosis | pathological production of gummy exudates in citrus and various stone-fruit trees. |
| ~ canker | a fungal disease of woody plants that causes localized damage to the bark. |
| ~ cotton ball | a fungus disease of cranberries. |
| ~ crown gall | a bacterial disease of plants (especially pome and stone fruits and grapes and roses) which forms excrescences on the stem near the ground. |
| ~ crown wart | a fungous disease of alfalfa which forms white excrescences at the base of the stem. |
| ~ damping off | a plant disease caused by a fungus; diseased condition of seedlings in excessive moisture. |
| ~ dieback | a disease of plants characterized by the gradual dying of the young shoots starting at the tips and progressing to the larger branches. |
| ~ dry rot | a crumbling and drying of timber or bulbs or potatoes or fruit caused by a fungus. |
| ~ heartrot | any plant disease in which the central part of a plant rots (especially in trees). |
| ~ mosaic | viral disease in solanaceous plants (tomatoes, potatoes, tobacco) resulting in mottling and often shriveling of the leaves. |
| ~ rhizoctinia disease | disease caused by rhizoctinia or fungi of Pellicularia and Corticium. |
| ~ pink disease | serious bark disease of many tropical crop trees (coffee, citrus, rubber); branches have a covering of pink hyphae. |
| ~ potato wart | fungous disease causing dark warty spongy excrescences in the eyes of potato tubers. |
| ~ root rot | disease characterized by root decay; caused by various fungi. |
| ~ scorch | a plant disease that produces a browning or scorched appearance of plant tissues. |
| ~ sweet-potato ring rot | disease of sweet potatoes in which roots are girdled by rings of dry rot. |
| ~ sclerotium disease, sclerotium rot | plant disease cause by fungi of the genus Sclerotium; also one in which sclerotia are formed. |
| ~ dutch elm disease | disease of elms caused by a fungus. |
| ~ ergot | a plant disease caused by the ergot fungus. |
| ~ foot rot | plant disease in which the stem or trunk rots at the base. |
| ~ pinkroot | a fungal disease of onions. |
| ~ wilt, wilt disease | any plant disease characterized by drooping and shriveling; usually caused by parasites attacking the roots. |
| ~ smut | destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores. |
| ~ soft rot | mushy or slimy decay of plants caused by bacteria or fungi. |
| ~ yellow dwarf | any of several virus diseases of plants characterized by stunting and yellowing of the leaves. |
| ~ yellow spot | any of several fungous or viral diseases characterized by yellow spotting on the leaves. |
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