词汇 | insecticide |
释义 | insecticide noun[ C or U ] uk /ɪnˈsek.tɪ.saɪd/ us /ɪnˈsek.tə.saɪd/ a chemical substance made and used for killing insects, especially those that eat plants杀虫剂 Compare herbicide pesticide Plant pathology anthracnose antifungal apple scab ash dieback auxin canker downy mildew dry rot Dutch elm disease etiolated excrescence fungicidal leaf scorch leaf spot nodal organophosphate pesticide potato blight scald sterility You can also find related words, phrases, and synonyms in the topics: Improving fertility & pest control insecticide | American Dictionaryinsecticide noun[ C/U ] us/ɪnˈsek·təˌsɑɪd/ a chemical substance for killing insects Examples of insecticideinsecticide For the rotation plots, sets of cards for all four insecticides used in the rotation schedule were prepared each week for the bioassays. Each of the seasonal factors increased the impact of the insecticide because they lowered the population's growth potential. Insecticide treatments (pyrethroids and neonicotinoids) applied before collection of the spring sample may be responsible for such selection. To enable measuring the effect of reduced borer densities on maize yield, the maize monocrop and all intercrops were grown with and without insecticide treatment. No insecticides were applied to the permanent data trees and two guard rows on either side throughout the study. The use of insecticides has been the major control strategy for cowpea and okra pests, especially in the tropics. Three chapters are devoted to insecticides, for mulations and application methods, and problems associated with their use, particularly the development by pests of insecticide resistance. For this reason, reliance on insecticides as the sole means of managing infestations was considered at best a short term solution. The lack of early or mid-season insecticide stress in organic cotton may have favored naturally occurring biological control of cotton aphid16. This suggests that additional organophosphate products were used by farmers at times of high insecticide use. Comparisons were done across all insecticide and crop mixture treatments, between leaves and tips and varieties. Many smallholders do not use insecticides at all, so that they suffer significant pest-related yield losses. These insecticide savings become even more pronounced when commercial product concentrations are converted into amounts of active ingredients. Life-history cost associated with the evolution of insecticide resistance. The remaining insecticide-susceptible aphids could then more easily be controlled with an application of any aphicide that is less damaging to non-target species. 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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