| 单词 | aphid |
| 释义 | aphid noun[C] uk/ˈeɪ.fɪd/us/ˈeɪ.fɪd/any ofvarioussmallinsects, such as thegreenfly, thatsuckthejuicesofplantsforfood 蚜虫 mikroman6/Moment Open/GettyImages Insect names
Examplesofaphidaphid The parents were transferred to new bean plants to avoid overcrowding and early death of plants and aphids. From theCambridge English Corpus Unlike spotted alfalfaaphid, vein chlorosis was not observed after spotted cloveraphidfeeding in this experiment. From theCambridge English Corpus Daily fecundity (number of nymphs produced per adult per day) varied with time for bothaphidspecies and in each experiment (fig. 2). From theCambridge English Corpus Twenty-four hours later, the plants were checked to see if the foundingaphidhad settled and any nymphs produced were counted. From theCambridge English Corpus It was demonstrated that this spider did not simply consume greater quantities of aphids because it was bigger. From theCambridge English Corpus Each year winged aphids migrate into the area in early summer, and populations expand on adult cereal plants. From theCambridge English Corpus However, aphids from tobacco were not sampled from other host-plants in regions where tobacco is not common. From theCambridge English Corpus What is responsible for the apparent specificity ofaphidresistance genes? From theCambridge English Corpus In this paper the hypothesis that the aphids' antennae are crucial for the wing induction in the presence of natural enemies is tested. From theCambridge English Corpus Such dramatic responses toaphidfeeding are unusual and probably indicate the involvement of toxic aphid saliva or hypersensitive reactions of the cypress trees. From theCambridge English Corpus However, why the correlation was only significant at the higheraphiddensities and not at the loweraphiddensities remains unclear. From theCambridge English Corpus The model assumes that, initially, both aphids and natural enemies coexist at low densities (mathematically, at a stable equilibrium). From theCambridge English Corpus Thisaphidmigrates to other parts, including below-ground stems, and so space is less likely to be a limiting factor. From theCambridge English Corpus In general, the treatments with the largest concentrations of alfalfa also had the highest numbers of aphids. From theCambridge English Corpus The observed population outbreaks and subsequent crashes correspond, essentially, to theaphidpopulation switching rapidly from one locally stable manifold to another. From theCambridge English Corpus 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. |
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