| 释义 |
exocortis, n. Bot.|ɛksəʊˈkɔːtɪs|
[f. exo- + L. corti(ci)s gen. of cortex bark.]
A viroid disease of certain citrus plants, esp. of the trifoliate orange (Poncirus trifoliata), the symptoms of which include exfoliation, scaling of the bark, and severe stunting of the crown.
1948Calif. Citrograph XXXIII. 230/1 A bark shelling of trifoliate orange, known as exocortis, has been noted occasionally for many years but has been hitherto considered a minor manifestation on this stock. 1952Calif. Agric. Nov. 5/1 The citrus root disease called exocortis is present in most areas where trifoliate orange—Poncirus trifoliata—is used as a rootstock. 1962J. N. Winburne Dict. Agric. 268/1 Exocortis, a virus disease of the trifoliate-orange. 1977S. P. Raychaudhuri Man. Virus Dis. Trop. Plants xiv. 132 Exocortis of citrus was formerly known to be due to virus. However, recently it has been established that this malady is due to a new entity called viroid. 1981T. O. Diener in E. Kurstak Handbk. Plant Virus Infections xxvii. 922 In many citrus species and varieties, infection with the exocortis agent does not result in obvious macroscopic symptoms. 1984Roberts & Boothroyd Fund. Plant Path. (ed. 2) iv. 46 Among these pathogenic agents are those of..exocortis of citrus, and chlorotic mottle of chrysanthemum. |