| 释义 |
ˈdie-back, n.
[from the phrase to die back: see die v.1 14.]
The progressive dying of a shrub or tree shoot from the tip backwards, caused by disease or unfavourable conditions, esp. a disease of fruit trees.
1886in S. Fallows Suppl. Dict. 1895Dept. Agric. Yearbk. 1894 (U.S.) 199 Die-back manifests itself by a number of striking characters. The foliage becomes very dark green, [etc.]. Ibid. 200 Finally a reddish brown resinous substance exudes on the twigs, forming the so-called die-back stain. 1910G. Massee Dis. Cultivated Plants & Trees 430 Die back of willow shoots..attacks the tips of willow shoots and causes them to die back. 1916B. D. Jackson Gloss. Bot. Terms (ed. 3) 112/2 Die-back, of Salix, a disease due to Diplodina salicina; ∼ of Citrus, some uncertain condition of health; ∼ of Prunus, from Naemospora crocea. 1928Forestry II. 27 Out in the forest die-back or canker due to frost is only likely to occur in particular areas. 1933Discovery Feb. 66/2 Phytopthora cambivora has been isolated from dying beech in two separate woods in Somerset, and has been found to be the undoubted cause of the die-back. 1938Nature 2 Apr. 612/1 Trees may be killed [by elm disease] in a single year, or the dieback may be more gradual. 1949E. Hyams Not in our Stars i. 8 The Morello plantation has very bad die-back. 1957Country Life 8 Aug. 248/1 Slight lightning discharges may do no more than cause dieback in a few of the topmost twigs. 1968Punch 27 Mar. 466/3 The central brown stain from dieback disease. |