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Callus Parenchyma tissue that grows over a wound or graft and protects it against drying or other injury. ...
Calyx Outermost whorl of organs of a flower. ...
Canker death of cambium tissue and loss and/or malformation of bark; or by the formation of sharply delineated, dry, necrotic, localized lesions on the stem; the term canker also may be used to refer to the lesion itself, particularly in woody plants. ...
Canker on apple
Carrier A plant or animal that carries a virus or other infective agent without showing symptoms. ...
Chasmothecium (pl. Chasmothecia) Closed, usually spherical, ascus-containing structure of powdery mildew fungi, also known as a Cleistothecium. A sexual fruiting structure. ...
Chasmothecium
Chemotherapy Treatment of disease by chemicals (chemotherapeutants) working internally. Chemical agent has toxic effect directly or indirectly on the pathogens without injury to the host plant. ...
Chimera A plant with several tissue sectors or layers differing in genetic or chromosomal constitution from the original plant. ...
Chlamydospore A thick-walled asexual resting spore formed by the modification of a fungus hypha. ...
Chlamydospore
Chlorosis The abnormal plant color of yellowish-white or gray condition of plant parts resulting from the incomplete destruction of the chlorophyll. ...
Chlorosis
Cirrus (pl. Cirri) A curl-like tuft; a tendril-like mass or "spore horn" of forced-out spores. ...
Cirrus