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natural predators
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  “natural predators”译为未确定词的双语例句
     Natural predators of Thrips palmi (Karny) and their role in natural control
     节瓜蓟马的主要捕食性天敌及自然控制作用
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     A STUDY OF THE NATURAL PREDATORS OF THE PINE BAST SCALE
     辽宁松干蚧捕食天敌的研究
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     PACKAGED TECHNIQUES FOR THE PROTECTION AND USE OF THE NATURAL PREDATORS ON THE CONTROL OF LOCUSTA MIGRATORIA MANILENSIS
     鲁北地区东亚飞蝗天敌保护利用配套技术
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     Predatory Insects-The killer Instinct of natural Predators
     昆虫掠食者 天敌昆虫的杀手本色
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     Effect of intercropped herbage in jujube plantation on the community dynamics of natural predators and pests
     间种牧草对枣园捕食性天敌与害虫群落动态的影响
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  相似匹配句对
     Natural.
     Natural(天然等同)相近。
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     Predatory Insects-The killer Instinct of natural Predators
     昆虫掠食者 天敌昆虫的杀手本色
短句来源
     A STUDY OF THE NATURAL PREDATORS OF THE PINE BAST SCALE
     辽宁松干蚧捕食天敌的研究
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     The Natural Meaning
     自然的心迹
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     3G Predators
     3G分食者
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  natural predators
Toxicity assays of ladybirds using natural predators
      
cumulanta ability to detect the potential presence of its natural predators by this odor.
      
We exposed the freshwater amphipod Gammarus lacustris, to chemical stimuli from injured conspecifics and to chemical stimuli from two types of natural predators: dragonfly larvae (Aeshna eremita) and northern pike (Esox lucius).
      
Reactions of Gammarus lacustris to Chemical Stimuli from Natural Predators and Injured Conspecifics
      
We were able to test in the laboratory and also in natural conditions the different products identified, and we were able to test the reactions of several cockroaches when attacked by natural predators (beetles, lizards, toads, and bats).
      
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Two trials on the control of sorghum aphid and soybean aphid with pirimicarb were carried out from 1980 to 1984. Results show that controlling the two aphids with 5% pir-micarb (wettable powder) is as effective as that with 40% rogor (emulsifiable concentrate) which is presently adopted in production. Though the effective rate of both aphidcides is more than 98% 48 hours after application, controlling the two aphids with pirimicarb has more advantages-less in dosage (75-125g av/ha in production) , lower in cost,...

Two trials on the control of sorghum aphid and soybean aphid with pirimicarb were carried out from 1980 to 1984. Results show that controlling the two aphids with 5% pir-micarb (wettable powder) is as effective as that with 40% rogor (emulsifiable concentrate) which is presently adopted in production. Though the effective rate of both aphidcides is more than 98% 48 hours after application, controlling the two aphids with pirimicarb has more advantages-less in dosage (75-125g av/ha in production) , lower in cost, better in effect (only 5 - 7 days residual life) , safety to both humanbeings and animals, free from unpleasant odour and harmless to most natural predators.

抗蚜威是一种氨基甲酸酯类杀虫剂。现除进口外,国内已开始生产。本文总结了几年来的药效试验结果,为即将在生产上推广使用提供依据和参考。

The succession of insect community in wheat fields in the south of Shaiixi was studied by using the principal component analysis method. There were three stages. The main trend of succession was as fo.llows; Pest insects and their natural predators existed in small numbers in early spring. The species in the community were evenly distributed. It is not necessary to take control measures. Most of the insects were in their peak phases. The distribution of species were not even in the unstable community....

The succession of insect community in wheat fields in the south of Shaiixi was studied by using the principal component analysis method. There were three stages. The main trend of succession was as fo.llows; Pest insects and their natural predators existed in small numbers in early spring. The species in the community were evenly distributed. It is not necessary to take control measures. Most of the insects were in their peak phases. The distribution of species were not even in the unstable community. The insect community was in the decline. In the meantime, the principal component analysis revealed the main insect species, affecting insect community succession, and their dynamics. Analysis also revealed the influence of pest management measures on the insect community in wheat fields. The abundance, diversity, and rate of even distribution of the community decreased with chemical applications.

应用主分量分析法探讨小麦返青到收获不同管理措施下昆虫群落演替规律,把随生育期的演替划分为三个阶段。总的趋势是:早春麦田害虫和天敌数量较低,各物种在群落中分布均匀,没有防治必要;第二阶段,多数昆虫处于鼎盛时期,各物种分布极不均匀,群落处于不稳定状态;第三阶段处于衰落阶段。主分量分析还表明了引起麦田昆虫群落演替的主要昆虫类群及他们的变动规律。也比较了管理措施对麦田昆虫群落的影响,施药防治2次的水浇地比不施药的水浇地,无论丰富度、多样性还是均匀度都低;施药一次的扩浇地次之。

The paper studies the law of growth and decline of the population densities of citrus red mite Panonychus citri McG. on Osmanthus fragrans and its relationship with environmental factors. There are four peak periods of population densities in one year, of which two peaks(mid April to early of May and mid-May to early of June) are the highest. The effect of environmental factors, namely temperature, relative humidity, light hours, rainfall and predatory enemies(Phytoseius and Anysitis),is not obvious to egg...

The paper studies the law of growth and decline of the population densities of citrus red mite Panonychus citri McG. on Osmanthus fragrans and its relationship with environmental factors. There are four peak periods of population densities in one year, of which two peaks(mid April to early of May and mid-May to early of June) are the highest. The effect of environmental factors, namely temperature, relative humidity, light hours, rainfall and predatory enemies(Phytoseius and Anysitis),is not obvious to egg densities; but it is obvious to densities of larva, nymph and adult.The influence of predatory enemies is the greatestofall.The mite densities are in inverse proportion to light hours. The regression formulas about the densities(No./leaf)of the red mite(Y5), except for eggs, are buit as follows: Y5=0. 2562+0. 0.584xT2(temperature of the previous day of investigation)-0. 1320xs1(light hours of the same day)+ 0. 1172x31(numbers of major natural predator mites)(R=0.5761)

本文研究了桔全爪螨种群在桂花上的消长规律及与环境因子的关系。桂花上桔全爪螨种群一年中有4个高峰,其为害最高峰在4月中旬~5月上旬及5月中旬~6月上旬。环境因子温度、相对湿度、光照时数、降雨量及天敌对卵量影响较小,对幼、若、成螨的数量影响较大,其中天敌因子的影响尤为显著,螨量与光照时数呈负相关的关系。螨量与环境因子的逐步回归方程为:y5=0.2562+0.0584x_(T2)-0.1320x_(S1)+0.1172x_(31)(R=0.5761)。

 
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