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pest population
相关语句
  害虫种群
     Forecasting the Dynamics of Pest Population with the Spectrum Analysis Method
     害虫种群动态的频谱分析预测
短句来源
     Relationship Between Animal Community Dynamics and Pest Population in Cotton Field
     棉田动物群落动态及天敌与害虫种群之间的关系
短句来源
     FORECASTING PEST POPULATION DYNAMICS OF PEST BY FISHER DISCRIMINATORY RULE
     用Fisher判别准则预测害虫种群动态
短句来源
     If the genotypes of immigration individuals are all resistant (R gene), and the immigration ratio is below the threshold, then it will accelerate the resistance evolution of pest population.
     若迁入个体携有R基因 ,则迁入比例在阈值以下时 ,会促进迁入区害虫种群的抗性演化 ;
短句来源
     The position role and effect of different control measures were discussed in the integrated management against thc cone and seed pests of Larix gmelini based on the study of the pest population dynamics.
     在深入研究落叶松种实害虫种群动态的基础上,探讨了各种防治措施在综合治理中的地位、作用和效果。
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  “pest population”译为未确定词的双语例句
     The result of 17% CarbendazimCarbofuran seed coating agent treated maize seed showed that,seedling rate increased 20.8%~28.0%,pest population density decreased 27.7%~48.9% and seedling survival rate was 79.8%~86.2%,53.8%~68.1% seedling was protected against stem rot and yield increased 6.9%~9.9%.
     试验结果表明,用17%呋多种衣剂处理玉米种子,可提高出苗率20.8%~28.0%,降低虫口密度27.7%~48.9%,保苗效果可达79.8%~86.2%,对茎腐病的防效达53.8%~68.1%,增加产量6.9%~9.9%。
短句来源
     The results showed that the control effect of investing plant ratio, that of pest population and that of leaf area reached 82.06%, 89.67% as well as 91.17% in tomato greenhouse, and 79.61%, 83.82% as well as 87.62% in eggplant greenhouse, respectively.
     茄子的防效分别为79.61%、83.82%和87.62%以上。
短句来源
     Optimal Pulse Spraying Pesticide Policy in a Pest Population Model with Stage-structured and Birth Pulse
     对具阶段结构和生育脉冲的种群模型脉冲喷洒杀虫剂的最优策略(英文)
短句来源
     Mixed application of the two viruses was tested in the cabbage fields of the suburbs of Taian City, Shandong Province in 1990. A 91.5% reduction of the total pest populations was obtained. In comparison, the pest population reduction in the fields where PrGV (at 3×10-3 ), PaNPV (at 1.5×106) and Omethoate were used alone was 65.1%, 37.9%, and 73.1%, respectively.
     1990年在泰安市郊使用这两株病毒混合液喷洒甘蓝,混施区总虫口下降率91.5%,而单独使用区PrGV(3×10~(-3))、PaNPV(1.5×10~6)以及氧化乐果(1000倍液)的虫口下降率分别为65.1、37.9和73.1%。
短句来源
     Its spatial dependence was 3 7328~4 8983 m,heterogeneity degree was 1 4482~4 4134,and sample variance was 1 6941~5 8167.The results and methods could be applied to monitor the temporal and spatial dynamics of target insect pest population in tobacco field,and provide scientific basis for ecological control.
     不同时期草间小黑蛛种群的空间结构模型也均为球型 ,空间格局呈聚集型分布 ,空间相关距离在 3 732 8~ 4 8983m之间 ,异质系数为 1 4 4 82~ 4 4 1 34,空间依赖程度为 1 6 94 1~5 81 6 7 该结果和方法可用于监测烟田目标害虫的时空格局动态
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  相似匹配句对
     Population system control of pest
     害虫的种群系统控制
短句来源
     ECOLOGICAL MANAGEMENT OF PEST INSECT POPULATION
     论害虫种群的生态控制
短句来源
     Population and Pollution
     人口与污染
短句来源
     population development;
     3.人口增长;
短句来源
     ⑤pest;
     ⑤虫害因素 ;
短句来源
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  pest population
The relatively high GD value of 48% exhibited by the pest population from Pattambi was the only exception.
      
No RAPD-PCR bands diagnostic to the pest population from any specific region were identified.
      
This is probably more related to the unsuitable conditions of wheat growth stages during which the pest population is increasing, rather than to the effects of its rich, natural enemy complex.
      
In the course of two years, the pest population decreased from a peak level of 122 eggs to 2-7 per half-leaf.
      
In the Mamora cork oak forest (Morocco), oophagous predators of the gypsy mothLymantria dispar (L.) (Lepidoptera: Lymantriidae) are one of the main mortality factors influencing pest population dynamics.
      
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During the rice growing seasons in 1961, the authors conducted a series of ob-servations on the rice insect pests around the Dung-ting Lake of Hunan province. Atotal of 46 species of rice pests was found, the 45 insect species belonging to 18 dif-ferent families and 8 orders, the other pest belonging to order Oligochaeta. Amongthese pests, the rice stem borers (3 spp.), the leafhoppers (4 spp.), the grasshoppers(2 spp.), the rice leaf-rollers (2 spp.), the rice weevil (1 sp.), the leaf...

During the rice growing seasons in 1961, the authors conducted a series of ob-servations on the rice insect pests around the Dung-ting Lake of Hunan province. Atotal of 46 species of rice pests was found, the 45 insect species belonging to 18 dif-ferent families and 8 orders, the other pest belonging to order Oligochaeta. Amongthese pests, the rice stem borers (3 spp.), the leafhoppers (4 spp.), the grasshoppers(2 spp.), the rice leaf-rollers (2 spp.), the rice weevil (1 sp.), the leaf beetle (1 sp.),the thrips (2 spp.), and the Annelida (1 sp.), are considered as major pests of rice in thislocality. This paper not only deals with a comparison of the pest populations and com-munities between rice fields, planted to early rice, middle rice and late rice, but alsodeals with a similar comparison between the older and newer rice fields. The resultsmay be briefly summarized as follows: 1. In all the rice fields, the period of numerical summit of each insect populationdoes not appears at same time. 2. In all the rice fields, the important components of each insect community weredifferent. 3. In the older or newer rice fields, the communities and populations of rice insectpests were different. 4. Due to different history of the rice fields, different biological characters of theinsect pest, and different environment (climatic or dietary factors), the communities andpopulations of rice insect pests were also different. The causes of their difference weredescribed.

本文记述了1961年在湖南滨湖区水稻生长季节中每五日调查稻虫的结果。 查明该地区共有水稻害虫46种。田间虫口密度大小因稻田类型和季节的不同而异,早稻田和中稻田有7种害虫数量较大,一季晚稻田有9种,双季晚稻田有4种。 全年内各种主要稻虫种群数量高峰出现的时间、次数、以及峰态的高低均有不同。种群数量较大的害虫,依其高峰期出现的迟早顺序,有稻象虫、稻蝗、二化螟、褐稻虱、黑尾叶蝉、稻苞虫、三化螟和粉白飞虱等。 在不同历史条件的稻田里,稻虫群体组成及数量互有差异。老稻田稻虫种类较复杂,主要稻虫虫口密度较高。新开稻田稻虫种类较少(如颤蚓、三化螟等),而叶蝉和飞虱等较多。 分析了稻田历史条件、稻由生物学特性、还及气候和食料条件,对于稻虫群体组成及种群数量变动的影响。

The wheat wireworm, Pleonomus canaliculatus Fald. is densely distributed over theloamy region along the river banks in Nanyang, in south-west Honan. The results ofa preliminary field survey made in May, 1963, show a striking contrast of populationdensity between the two groups of fields under different crop rotation systems. Theheavily populated fields are those that have been continuously used for growing twocrops a year, and the intervening crops in the wheat rotation are usually corn, mungbeanand sweet potato....

The wheat wireworm, Pleonomus canaliculatus Fald. is densely distributed over theloamy region along the river banks in Nanyang, in south-west Honan. The results ofa preliminary field survey made in May, 1963, show a striking contrast of populationdensity between the two groups of fields under different crop rotation systems. Theheavily populated fields are those that have been continuously used for growing twocrops a year, and the intervening crops in the wheat rotation are usually corn, mungbeanand sweet potato. On the other hand, the fields of low population density are generallyused for growing five crops in three years or a single crop a year, sesame, soybean andsorghum are mainly used as the intervening crops. Analysis of the factors responsible for the differences in pest population density indi-cates that the cultural practices and fallowing in the different rotational systems are themajor ones involved. Suggestions on rotational control measures are made for the heavily infested regions.It is believed that a 5-crop-3-year-rotation should be adopted as much as possible, whilethe less susceptible crops (sesame, soybean etc.) are used as intervening crops in thewheat rotation.

沟金针虫在南阳一带主要分布在沿河平原壤土地区。1963年在新野严重为害地区的初步调查表明:高密度(每平方米23.5头)地块多为连年一年两熟或四年七熟,晚秋作物多系玉米、绿豆和红薯等;低密度(每平方米2.7头)地块则以三年五熟及一年一熟为主,晚秋作物多为芝麻和黄豆。结合沟金针虫在当地的生活习性分析,认为伴随不同轮作制的土壤耕作是影响金针虫数量变动的主导因子。鉴于当前农业生产上急于要求合理轮作倒茬,同时有关文献也述及对大面积金针虫防治应重视农业措施的方向,建议除对金针虫发生为害与当地农作制的关系进行深入调查研究外,在严重为害区,建立这方面的防治示范点。就南阳地区情况,试采用如下措施:(1)金针虫严重地块,当季作物收获后尽可能休闲。否则进行666土壤处理。(2)尽可能采用三年五熟或四年六熟的轮作制,避免三年以上的连年—年两熟。(3)在以小麦为主的轮作制中,尽可能用芝麻、黄豆等换替玉来、绿豆及红薯等;避免三年以上的小麦与玉米、绿豆及红薯等连年连作。

Pyrausta machaeralis Walker is an important defoliater of Tectona grandis.It has 11 to 12 generations a year in Hainan Island.The larva does not enter hibernation in winter and the pest populations reach maxima in July and August.The larva spin an open web and eats up the tissues between the veins and thus skeletonises the leaves.The larval stage has five instars and the mature larva pupates mostly on a green teak leaf.The moth needs supplemental nutrients after emergnce.It hides during the day in shaded...

Pyrausta machaeralis Walker is an important defoliater of Tectona grandis.It has 11 to 12 generations a year in Hainan Island.The larva does not enter hibernation in winter and the pest populations reach maxima in July and August.The larva spin an open web and eats up the tissues between the veins and thus skeletonises the leaves.The larval stage has five instars and the mature larva pupates mostly on a green teak leaf.The moth needs supplemental nutrients after emergnce.It hides during the day in shaded places and mating and oviposition take place at night.The eggs are laid singly on the underside of the leaf and the maximal number of eggs produced by a single female is 500 (217 in average).A field survey showed that it has eighteen natural enemies including parasites and predators.For chemical control dusting with 1.5% Parathion plus 35 BHC mixture powder gives satisfactory results.

柚木野螟(Pyransta machaeralis Walker)是柚木的主要食叶害虫。在沟南岛一年发生11—12代,无冬蛰现象,7—8月是虫口高峰期。幼虫在柚木叶上结疏网,取食叶肉留下叶脉,且具一圆形“逃跑孔”是该虫为害的主要特征。幼虫五龄。化蛹场所主要在柚木叶上。成虫羽化后需行补充营养才能交尾、产卵。成虫白天隐藏在林内地被物杂草上,夜间活动。一雌蛾最多可产卵500粒,平均217粒。卵散产于叶背面。已发现18种寄生和捕食性天敌。用1.5%1605+3%666混合粉剂每亩2—3斤喷粉防治效果良好。

 
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