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predators
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  捕食性天敌
    Evaluation on Role of Predators in Helicoverpa armigera Control
    棉铃虫捕食性天敌控制作用评价
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    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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    Effects of transgenic Bt plus CpTI cotton on the predating functional response of main predators in cotton field
    转双价基因(Bt+CpTI)棉对棉田主要捕食性天敌捕食功能反应的影响
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    Fuzzy cluster analysis of the cotton aphid and its predators in Chinese prickly ash orchard
    花椒园棉蚜及其捕食性天敌动态的模糊聚类分析
短句来源
    2 The population dynamic and composition of predatory enemiesThe results indicated 28 species of predators belonging to 7 orders, 15 families, were found in coton fields.
    2 棉田捕食性天敌组成及种群动态经过系统调查,初步得出该垦区捕食性天敌隶属于7目15科28种。
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  天敌
    Methods for Evaluation of Predators and Parasitoids in the Control of Insect Pests and Strategy for Their Practical Application
    天敌动物对害虫控制作用的评估方法及其应用策略
短句来源
    The relative abundance of predators was 0.44234. Micryphantidae Coccinellidae Pristomyrmex pungens Mayr and spiders were dominant enemies of predators.
    捕食类害虫总群落的相对丰盛度为 0.44234,优势天敌是微蛛科 Micryphantidae 和瓢虫科 Coccinellidae。
短句来源
    The study shows:(1)the sorts, numbers and formation of insects and their predators insoybean are different with the cropping patterns of early and late soybean.
    研究大豆不同种植方式对大豆害虫及其天敌种类和数量关系的结果指出:(1)大豆地的大豆害虫及其天敌种类、数量和组成,随早、晚大豆种植方式的不同而不同;
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    An investigation on insect natural enemies of gypsy moth, Lymantria dispar L. (Lepidoptera:Lymantridae) was carried out in 1996 and 1997. Totally 23 species of the natural enemies were gotten, of which 17 species are parasitoids and 6 predators.
    1996~1997年在北京地区进行了调查,通过采集舞毒蛾在室内饲养,共得到舞毒蛾天敌昆虫23种,其中寄生性昆虫17种,捕食性昆虫6种。
短句来源
    the ratios of species richness between predators to pests were 1∶0.60 (O), 1∶0.64 (S), and 1∶0.71 (C) while the ratios of abundance between predators to pests were 1∶0.84 (O), 1∶3.21 (S), and 1∶3.17 (C);
    ③天敌与害虫种数之比依次为1∶0·60、1∶0·64和1∶0·71,个体数之比依次为1∶0·84、1∶3·21和1∶3·17;
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  “predators”译为未确定词的双语例句
    Control Function of Predators in Coexistent System of Three Spiders and Two Rice Insect Pests
    多物种共存系统中蜘蛛对稻虫的控制作用
短句来源
    Dynamics of Cry1Ab protein from transgenic Bt rice in herbivores and their predators
    转Bt基因水稻表达的毒蛋白Cry1Ab在害虫及其捕食者体内的积累动态
短句来源
    Based on the results as above, 4B8 was chosen to study the interactions between N. lugens and their predators in the field.
    根据上述结果,初步确定4B8 用于捕食作用研究。
短句来源
    2) Five McAbs, namely 1B5, 2F10, 2G12, 3D8 and 4F8, were developed against the collembola using hybridoma technique. They had high absorption values even they were diluted over 1.024×108 times. All of the McAbs only reacted with the collembola while not cross-reacted with other insect pests and predators.
    2) 应用杂交瘤技术,制备了5 株多种弹尾虫复合体的单克隆抗体细胞株,分别命名为1B5、2F10、2G12、3D8 和4F8。
短句来源
    The relative abundance of pests , predators, parasitoids and neutralities were 0.6361-0.7018 ,0.1641-0.1907, 0.0418-0.0647 and 0.0923-0.1085 respectively in Spring sowing season .
    春种菜用大豆田害虫类的相对丰盛度为0.6361~0.7018,捕食类的相对丰盛度为0.1641~0.1907,寄生类和中性类的相对丰盛度分别为0.0418~0.0647和0.0923~0.1085。
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  predators
Global asymptotic stability of the periodic Lotka-Volterra System with two-predators and one-prey
      
The three species Lotka-Volterra periodic model with two predators and one prey is considered.
      
They are generalist predators and thus may affect native species through predation.
      
The results indicate that bullfrogs exert different predatory influences on native fauna at different sites and that bullfrogs are generalist predators with extensive ecological impacts on native fauna.
      
We think that the overlong-chain aldehydes defend the sponge from fouling and predators.
      
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Pleonomus canaliculatus Falderm. is one of the most destructive soil-inhabitinginsects to wheat in Honan. It causes considerable losses to the crop in spring bycutting the underground part of the stems, causing withering and death of the plant.The life history, distribution, host plants, morphology and rearing methods of theinsect are given in this paper. The overwintering adults become active in spring. Eggs are laid in the topsoil about the plant. They hatch in 5-8 weeks and the larvae grow to maturity inat...

Pleonomus canaliculatus Falderm. is one of the most destructive soil-inhabitinginsects to wheat in Honan. It causes considerable losses to the crop in spring bycutting the underground part of the stems, causing withering and death of the plant.The life history, distribution, host plants, morphology and rearing methods of theinsect are given in this paper. The overwintering adults become active in spring. Eggs are laid in the topsoil about the plant. They hatch in 5-8 weeks and the larvae grow to maturity inat least 15 months. Pupation takes place during late August up to mid-septemberand the pupal stage requires about 2 weeks. The young adults remain and overwinterin their pupal cells. Fall plowing to a depth of 6 to 9 inches soon after the harvest of summer cropswill destroy a great number of pupae and young adults by breaking up their cells inthe soil. The larvae are thus turned up and exposed to the predators. Rotation ofcrops by using sesame or legumes instead of millet preceding wheat, and summerfallow of the land are found to be helpful to lessening the infestation. Control may be effective by dusting γ-BHC (at,1.5 to 2.5 kgs of 0.5% γ-BHC permow mixed with 3 parts of dry soil or sand) into the top soil by means of a tripodhand-driller between the rows just before the activity of wireworms in spring.

1.沟金针虫需2年以上完成一代生活史。越冬成虫2月下旬出土,3月中旬至4月中旬为活动盛期,产卵在1至2寸表土内,卵于5月初孵化,卵期为5至8星期。老熟幼虫8月下旬开始化蛹。9月中旬起羽化,蛹期约2星期。成虫羽化后即行越冬。 2.越冬幼虫2月底至3月中旬开始向表土活动(10厘米处地温8—12℃左右),3月中旬及4月全月是为害盛期(80%以上幼虫集中在1至2寸之表土内),8月至12月表土之幼虫密度极小(仅有虫1.2—6.8%),不致为害成灾。 3.沟金针虫之天敌除一种壁虱(Cheyletus sp.)和一种蜘蛛及蚂蚁外,尚有寄生菌2种,具中一种经鉴定为冬虫夏草(Cordyceps sp.)之一种。 4.小麦整地时适当深犁(5—7寸)并精耕细作能毁杀大部分蛹体及成虫,并可将幼虫翻上来供鸟类捕食(9,10月间97%老熟幼虫,在5—7寸土内化蛹及羽化,同时88%幼虫分布于1—7寸土内)。此外以芝麻与豆类为小麦前作及夏季休间结合翻耕曝晒亦能减少虫害损失。 5.沟金针虫在河南的主要为害期系在春季,所以早春於麦行间耩666毒土或毒沙以毒杀向表土上升之幼虫是值得继续研究的。

The Australian ladybeetle (Rodolid cardinalis), a predator of the cottony cushionscale, was introduced to South China from the Soviet Union in the year 1955, and tothe vicinity of Chungking in 1960. It was a great success in the control of the cottonycushion scale. Our studies were chiefly on the life history of the Australian ladybeetleand its tolerance to some insecticides. In the vicinity of Chungking, it overwintets in the adult stage. There may be7--8 generations in the course of a year, when it is...

The Australian ladybeetle (Rodolid cardinalis), a predator of the cottony cushionscale, was introduced to South China from the Soviet Union in the year 1955, and tothe vicinity of Chungking in 1960. It was a great success in the control of the cottonycushion scale. Our studies were chiefly on the life history of the Australian ladybeetleand its tolerance to some insecticides. In the vicinity of Chungking, it overwintets in the adult stage. There may be7--8 generations in the course of a year, when it is bred in the insectary, and the ge-nerations are overlapping in the fields. The longevity of the female and male adultis 16.03--103.07 days and 10.00--46.30 days respectively. On an average, from 119.73to 329.43 eggs are laid by each individual (female) in the different generations, themaximum of a single female being 612 eggs, and the eggs require from 2.85 to 12.27days to hatch. The larval stage lasts 5.77 to 24.23 days, and the pupal stage lasts 3.30to 14.13 days. The difference between the lengths of the stages of different generationschiefly depends upon the temperature. Our studies indicate that, 0.26--2.50 and 0.40--2.15 cottony cushion scale can beeaten daily by the ladybeetle larva and the adult respectively. Insecticide tolerance experiment in the laboratory showed that the adult ladybeetleand eggs were much more resistant to the insecticides than the larvae. The 0.10%D.D.T. emulsion or 0.047% E-605 emulsion was harmful to the adults, larvae and eggs;0.03% γBHC emulsion or 0.3--1.0° Be lime-sulphur was harmful to the larvae, andless harmful to the adults and eggs, but 0.05% Dipterx was safe to the ladybeetle atany stage.

利用澳洲瓢虫防治吹绵蚧,在国外已有70多年的历史,防治效果显著,我国引入澳洲瓢虫后,在防治上亦取得很好的效果。据我们室内饲养结果,一年发生8代,完成一世代的历期19—229天,平均56.26天。每雌虫产卵5—612粒,平均产卵173.82粒,卵孵化率为30.55—99.42%。过冬的成虫于3月上旬大量产卵,3月中旬出现产卵高峰,第一代成虫于4月下旬出现。澳洲瓢虫在重庆地区防治吹绵蚧的有效期为3—11月。成虫抗药力最强,卵次之,幼虫最差。在生物防治区,当澳洲瓢虫与吹绵蚧的虫口比例为1:15左右时,经14—20天后,吹绵蚧便被消灭。从放虫的日期起,约经55—69天,可将全国内的吹绵蚧消灭。

The history of pest control in citrus orchards of the Chao-San district of Kwang- tung Province in the last thirty-seven years (1937-1973) may be divided into four stages, i.e., the stage of indigenous pesticide application (1937-1952), the stage of organoehloride pesticides (1953-1958), the stage of organophosphate pesticides (1959-1964), and the stage of acaricides combined with other pesticides (1965 to the present time). The groves in the first stage were characterized by the comparatively larger number...

The history of pest control in citrus orchards of the Chao-San district of Kwang- tung Province in the last thirty-seven years (1937-1973) may be divided into four stages, i.e., the stage of indigenous pesticide application (1937-1952), the stage of organoehloride pesticides (1953-1958), the stage of organophosphate pesticides (1959-1964), and the stage of acaricides combined with other pesticides (1965 to the present time). The groves in the first stage were characterized by the comparatively larger number of insect species. Principal chewing insect pests and sucking pests with weak adaptive capacity were eliminated in the second stage. In the organophosphate pesticide stage some sturdy species of sucking insects were further wiped off, but some pests resistant to the pesticides became conspicuous and their populations grew with the time. Then they became the dominant pests, among which the citrus spider mite Panonychus citri McGregor is the most important. It is noticed that this kind of faunistic change has taken place for three times in the last thirty-seven years.The writers noticed the faunistic change of arthropod pests in the citrus groves was caused by the indulgent applications of pesticides, which had greatly disturbed the natural balance between the pests and their natural enemies. Some pest species developed resistance to the pesticides, and others survived on the merit of their higher reproductive capacity or of their cryptic behaviour which endowed them with chance to avoid the action of pesticides. Their populations may rise and thus become the sources of pest resurgence.When the insect groups of the citrus groves that had subjected to pesticide treatment are compared with those that did not, one may find that the total number of insect species of the first category is lower, but the dominant pests usually have more abundant populations. It may be concluded that pesticide application acts to a certain degree to diminish the number of pest species in the citrus groves.In recent years new geometrid pests invaded some citrus groves in Kwangtung Province. The invasion was caused by the introduction of Calopogonium mucunoides Desv. into the groves as a covering crop. The population of the Capricorn beetle Chelidonium argentatum Dalm. was found to rise because of the application of pesticides which weakened the position of another Capricorn beetle, Mclanauster cMn-ensis Forst. which is its competing species. The rise of the populations of the fruit-piercing noctuid moths is thought to be related to planting citrus trees on hills where the moths were originally present. Human agricultural activities would un-evitably modify the physical and biotic environments of insects and thus change their trophic and interspecific relations. New pests usually become important species through periods of habituation and dispersion.Iu. order to carry out successful citrus pest control, the writers propose that the indulgent use of pesticides should be avoided. The choice of approprate kinds of pesticides and the way of their applications, especially concerning the dosage and frequency, is thought to be important. Integrated use of predators of some important pests such as the coccinellid Stethorus siphonulus Kapur. and the predatory mites (Phytoseiidae) should be considered as effective measures. Agricultural practices should be used as the fundamental control measure, which, when combined with chemical and biological controls, can lead to a better control system for the citrus groves.

自1937年到1973年的三十七年间,广东潮汕地区柑橘害虫的防治,大致可以分为四个阶段:即人工及土农药防冶阶段(1937—1952年)、有机氯杀虫剂阶段(1953—1958年)、有机磷杀虫剂阶段(1959—1964年)和杀螨剂兼用阶段(1965年至现在)。土农药阶段的昆虫特点是种类多、区系复杂。有机氯阶段淘汰了咀嚼式口器的主要害虫和适应能力比较差的吸收式口器害虫。有机磷阶段又淘汰了另一部分比较顽强的吸收式口器害虫。能产生抗药性的或新侵入、新发展的害虫种群数量上升,成为主要种类。这类害虫以橘全爪螨最为突出,三十七年间出现了三次显著变化。 导致柑橘园昆虫群落变化的主要原因在于不合理施用化学农药。它使天敌数量减少;有的害虫产生抗药性,或者由于繁殖力强,种群数量庞大;或栖息场所隐蔽,未受淘汰,成为再猖獗的虫源。作者调查和比较了施药与不施药的柑橘园昆虫区系后,见到施药柑橘园的昆虫种类较少,反映了昆虫区系的简化,但优势种群的数量则明显增多。 近年来,有些地区新侵入柑橘园成为优势种群的尺蛾科害虫,是由于引种未经检疫的带虫覆盖作物种苗——毛蔓豆所造成的。光绿橘天牛是由于施药后削弱了其竞争种——星天牛,才使种间关系改变的。吸果...

自1937年到1973年的三十七年间,广东潮汕地区柑橘害虫的防治,大致可以分为四个阶段:即人工及土农药防冶阶段(1937—1952年)、有机氯杀虫剂阶段(1953—1958年)、有机磷杀虫剂阶段(1959—1964年)和杀螨剂兼用阶段(1965年至现在)。土农药阶段的昆虫特点是种类多、区系复杂。有机氯阶段淘汰了咀嚼式口器的主要害虫和适应能力比较差的吸收式口器害虫。有机磷阶段又淘汰了另一部分比较顽强的吸收式口器害虫。能产生抗药性的或新侵入、新发展的害虫种群数量上升,成为主要种类。这类害虫以橘全爪螨最为突出,三十七年间出现了三次显著变化。 导致柑橘园昆虫群落变化的主要原因在于不合理施用化学农药。它使天敌数量减少;有的害虫产生抗药性,或者由于繁殖力强,种群数量庞大;或栖息场所隐蔽,未受淘汰,成为再猖獗的虫源。作者调查和比较了施药与不施药的柑橘园昆虫区系后,见到施药柑橘园的昆虫种类较少,反映了昆虫区系的简化,但优势种群的数量则明显增多。 近年来,有些地区新侵入柑橘园成为优势种群的尺蛾科害虫,是由于引种未经检疫的带虫覆盖作物种苗——毛蔓豆所造成的。光绿橘天牛是由于施药后削弱了其竞争种——星天牛,才使种间关系改变的。吸果夜蛾的增加为害则与“柑橘上山”,开垦山地和旱地种柑有关。 提出控

 
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