词汇 | dieback |
释义 | dieback noun[ C or U ] uk /ˈdaɪ.bæk/ us /ˈdaɪ.bæk/ a disease of trees or bushes in which the outer parts of the leaves or roots begin to die, followed by the branches. It is caused by the condition of the environment, or by attack from bacteria or fungi(= organisms that get their food from decaying material or other living things): Massive forest diebacks are occurring across the west. Officials have observed extensive dieback of shoots on Scots Pine. This damage results in canopy thinning, branch dieback, and eventually tree death. Scientists say the dieback could change the entire coastal ecosystem. Infested ash trees generally die within one to three years after showing crown dieback. Plant pathology anthracnose antifungal apple scab ash dieback auxin canker dry rot Dutch elm disease etiolated excrescence fungicidal fungicide leaf scorch leaf spot nodal organophosphate pesticide potato blight scald sterility See alsoash dieback Examples of diebackdieback For example, the metric might be the proportion of leaf area affected by mildew, or the proportion of plants in a population showing dieback lesions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Injecting and spraying phosphite also reduces the rate of spread of a dieback front for around five years. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Water deficiency has been attributed as the main cause of dieback as droughts are becoming more frequent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This was an artefact caused by secondary infection, leaf dieback or mechanical damage. Positive growth was recorded, as was lost height due to dieback and breakage. The cause of the dieback was not obvious; pathological studies are planned. Severe water stress, leading to dieback of the branches, causes the fruit to blacken. This may lead to dieback of branches when yields are excessive (see below). We used 2 analysis to compare seasonal patterns of mortality, dieback and resprouting to seasonal patterns of rainfall. Dieback is spatially patchy and is apparently a consequence of complex interactions between local rainfall deficits, soil conditions and competition between trees. This experiment was done under exceptionally favourable conditions for cocoa, with very high yields and little pressure from disease, as the scions all showed tolerance of vascular streak dieback disease. Hemispherical photographs were used to document an opening of the canopy that resulted from the dieback and mortality of large trees during the severe 1998 drought. Symbols denote periods when dieback was observed: < 1980; 1980s; 1990s. The growth of affected trees first started to decline in the mid 1980s, although the dieback did not become apparent until several years later. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The main one is known as oak dieback, a complex disease in which a number of damaging agents interact to bring about a deterioration in tree condition. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
随便看 |
|
反思网英语在线翻译词典收录了377474条英语词汇在线翻译词条,基本涵盖了全部常用英语词汇的中英文双语翻译及用法,是英语学习的有利工具。