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population growth
相关语句
  种群增长
    The Influence of Temperature and Photoperiod on the Population Growth of Wheat Aphids
    温度和光照对麦蚜种群增长的影响
短句来源
    The result showed that the temperature available for the population growth was 26~30 ℃.
    结果表明,适于苹果全爪螨实验种群增长的温度在26~30℃。
短句来源
    Influence of Temperature and Humidity on Population growth of the Experimental Liriomyza sativae
    温度和湿度对美洲斑潜蝇实验种群增长的影响
短句来源
    . The highest index of population growth occurred at 25 ? and achieved at 261 .22. When temperature reached 35 ?
    褐背小萤叶甲实验种群在25℃时增长最快,种群增长指数(Ⅰ)最高,达到261.22,当温度达到35℃时,种群不能存活。
短句来源
    The number of eggs laid by the female adults reached maximum at 24℃. Themaximum index and temperature for population growth were 7.43 and 26.1℃,respectively.
    24℃时成虫产卵量最高,环境温度在26.1℃时理论种群增长指数最大(7.43);
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  种群生长的
    Effect of temperature on population growth of susceptible and resistant strains of Nilaparvata lugens to imidacloprid
    温度对褐飞虱抗/感吡虫啉品系种群生长的影响
短句来源
    Effects of temperature on Brontispa longissima population growth.
    温度对椰心叶甲实验种群生长的影响
短句来源
  “population growth”译为未确定词的双语例句
    Density regulation of explosive population growth in Oxalis corymbosa
    爆发型种群铜锤草增长的密度调节
短句来源
    The results are summarized as follows:Three non-preference resistant wheat cultivars, i.e. KOK-1679, LI and Xiaobaidongmai could make the population growth rate of Sitobion avenae dramatically decreasing, and no negative impacts on parasitoid Aphidius avenae .
    以不选择性为主的小麦抗蚜品种(系)KOK-1679、L1和小白冬麦可显著降低麦长管蚜Sitobion avenae的种群增长率,对燕麦蚜茧蜂Aphidius avenae的控害作用没有负面影响。
短句来源
    After 9 days of S. avenae (at the beginning of 2nd instar) infestation, the population growth rate of S. avenae in susceptible cultivar Hongmanghong was 94.21%, but in the higher resistant line KOK-1679 was 18.05% .
    以2龄麦长管蚜若蚜接蚜9日后,低感品种红芒红上该蚜的种群增长率为94.21%,而高抗品系KOK-1679仅为18.05%。
短句来源
    Through the construction of the life tables for both strains, the effects of different temperatures on the experimental population growth were evaluated.
    通过构建不同温度下敏感品系和抗性品系的实验种群生命表 ,发现不适温度对 2个品系的生长发育和繁殖都有明显的影响 ,而且这种影响在 2个品系间存在差异。
短句来源
    POPULATION GROWTH OF THE BROWN PLANTHOPPER,NILAPARVATA LUGENS ST(?)L,AS INFLUENCED BY TEMPERATURE
    温度对褐飞虱种群生长的影响
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  population growth
A new class of competition models in which the population growth coefficients are represented by periodic delta-functions is designed.
      
Analysis of the available field and published data indicates a two-stage pattern of the population growth phase and a synchronous transition of wolf populations to this phase.
      
Selenium in concentrations of 0.01 and 0.5 mg/liter stimulated cell population growth, while the number of ultrastructural alterations was the same as in the control cells.
      
At a selenium concentrations of 1 mg/liter, cell population growth slightly decreased by the end of the experiment, and there was some increase in the number of cells with damaged organoids and in the number of completely destroyed cells.
      
salina, suppressing cell population growth and promoting extensive destructive changes.
      
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The present paper deals mainly with the fluctuations of the mixed population of 4cotton mirids, viz. Lygus lucorum Meyer-Dhr, Adelphocoris fasiaticollis Reuter, A. lineo-latus Goeze and A. suturalus Jak. Observations were made continuously in the cottonand alfalfa fields through-out the years 1954-1961 in Shensi. The relationships betweenthe mixed population and the populations of the four species were also compared. It is seen that the growth form of the mixed population of the cotton mirids may beinfluenced...

The present paper deals mainly with the fluctuations of the mixed population of 4cotton mirids, viz. Lygus lucorum Meyer-Dhr, Adelphocoris fasiaticollis Reuter, A. lineo-latus Goeze and A. suturalus Jak. Observations were made continuously in the cottonand alfalfa fields through-out the years 1954-1961 in Shensi. The relationships betweenthe mixed population and the populations of the four species were also compared. It is seen that the growth form of the mixed population of the cotton mirids may beinfluenced by the amounts and temporal distribution of rain-fall from June to August. Ac-cording to the position of the peak the population growth form may be divided intofour types: 1. Pre-peak type 3. Mid-peak type 2. Post-peak type 4. Bi-peak type On the basis of these different types of growth form, the temporal characteristicof damages in the growing season caused by the mirids could be clearly seen: Pre-peak type——damage mainly in the square period. Post-peak type——damage mainly in the boll period. Bi-peak type——damage in both the square and boll periods. Mid-peak type——slight damage in both the square and boll periods. The limiting factors for the fluctuations of the mixed population were also analyzed.The results showed that the population fluctuations in the square period were closelyrelated to both the amount of rain-fall in June and the basic populations in the alfalfafields in the early spring. But in the boll period the combined effect of temperatureand humidity played a more important role in checking the population of mirids. For convencience, three predictive formulae for the square and boll period have beensuggested in the following table:

本文以陕西关中棉区发生普遍,为害严重的绿盲爆(Lreu。l。ocr。m Mever-DQr)、首稻育馆(A人如加c。r订U。。。b拙。G。ez一、三点盲蝽(A.fasiaticollis Reuter)和中黑盲蝽(A.s。。tuturalus Jak.)四种盲蝽为对象,进行了数量变动的研究与分析。 文中依据生态特性的研究结果,结合8年的田间观察资料,对棉田内四种盲蝽混合种群与单种种群的消长曲线分别进行了分析与比较,根据分析结果,文中采用了盲蝽混合种群作为分析的对象,并提出棉田内盲蝽混合种群的消长曲线是受蕾铃期间降水量与降水期的影响,根据降水量与降水期的不同,其曲线变动可分为四个波动型,即前峰型、中峰型、后峰型与双峰型。由于峰型不同,即表示着该年的旱涝分布与棉株受害程度与阶段的不同,前峰型属前涝后旱型,亦即蕾期为害型:后峰型属前旱后涝型,亦即铃期为害型;双峰型属涝年型,亦即蕾铃两期为害型;而中峰型则属旱年型,亦即蕾铃两期受害均轻型。 文中依据棉株不同生长阶段中影响盲蝽种群数量变动的主导作用因素的分析结果,提出分析棉田盲蝽种群的变动应分为蕾期与铃期两阶段,由于棉株生长阶段不同,在这两阶段中影响盲蝽的主导作用因素亦...

本文以陕西关中棉区发生普遍,为害严重的绿盲爆(Lreu。l。ocr。m Mever-DQr)、首稻育馆(A人如加c。r订U。。。b拙。G。ez一、三点盲蝽(A.fasiaticollis Reuter)和中黑盲蝽(A.s。。tuturalus Jak.)四种盲蝽为对象,进行了数量变动的研究与分析。 文中依据生态特性的研究结果,结合8年的田间观察资料,对棉田内四种盲蝽混合种群与单种种群的消长曲线分别进行了分析与比较,根据分析结果,文中采用了盲蝽混合种群作为分析的对象,并提出棉田内盲蝽混合种群的消长曲线是受蕾铃期间降水量与降水期的影响,根据降水量与降水期的不同,其曲线变动可分为四个波动型,即前峰型、中峰型、后峰型与双峰型。由于峰型不同,即表示着该年的旱涝分布与棉株受害程度与阶段的不同,前峰型属前涝后旱型,亦即蕾期为害型:后峰型属前旱后涝型,亦即铃期为害型;双峰型属涝年型,亦即蕾铃两期为害型;而中峰型则属旱年型,亦即蕾铃两期受害均轻型。 文中依据棉株不同生长阶段中影响盲蝽种群数量变动的主导作用因素的分析结果,提出分析棉田盲蝽种群的变动应分为蕾期与铃期两阶段,由于棉株生长阶段不同,在这两阶段中影响盲蝽的主导作用因素亦不同,蕾期的虫口增长是受早春虫口基数与6月降水量两因素联合作用的结果,而铃期的虫口增长则系受温湿度组

The present work deals with the bionomics of thrips on corns in Peking suburbs.They include Anaphothripa obscurus (Miiller),Frankliniella tenuicornit (Uzel); Haplothrips aculeatus (fabricius); Scolothrips longicornis priesner and Aeolothrips fasciatus (Linnaeus).The former three species are pests injurious to crops while the latter two are predators.Special attention has been paid to A.obscurus which was not important until its outbreak in 1975.The adults of this species show wing polymorphism characterized...

The present work deals with the bionomics of thrips on corns in Peking suburbs.They include Anaphothripa obscurus (Miiller),Frankliniella tenuicornit (Uzel); Haplothrips aculeatus (fabricius); Scolothrips longicornis priesner and Aeolothrips fasciatus (Linnaeus).The former three species are pests injurious to crops while the latter two are predators.Special attention has been paid to A.obscurus which was not important until its outbreak in 1975.The adults of this species show wing polymorphism characterized by macropterous,brachypterous and intermediate forms.It seems to propagate exclusively through parthenogenesis since no male has ever been found up to now.The adult caused serious damage on corns in seedling stage,especially the interplanted spring corns.Wheat may serve as the host plant for its initial population growth and migration towards corn would take place in the late spring.In late June the spring corn grows into stages no more suitable for their infestation and at that time they would migrate to other host plants.Raining may check its multiplication but drought favours it.This pest may be controlled by appropriate irrigation and manuring the corn fields or by spraying with 40% Dimethoate in 1:1,500 dilution.

本文叙述了北京郊区玉米上蓟马的种类鉴别、寄主、为害征状及严重性、生活习性、发生为害与环境因素的关系和防治。种类有玉米黄呆蓟马 Anaphothrips obscurus(Muller),禾蓟马Frankliniellatenuicornis(Uzel),稻管蓟马(又名禾谷蓟马)Haplothrips aculeatus (Fabricius),长角六点蓟马gcolothrips longicornis Priesner,横纹蓟马 Aeolothrips fasciatus(Linnaeus)。前3种是害虫,后2种是天敌昆虫。本文着重报道了玉米黄呆蓟马。它过去在京郊为害不重,而1975年严重发生为害。成虫有长翅型、短翅型及半长翅型。雄虫至今未发现。主要是成虫对玉米苗造成严重为害。以春玉米上虫数最多,但对套种玉米为害最重,这与耕作改革有关。麦类是它向玉米上过渡的虫源基地。6月下旬,春玉米和中茬玉米的生长期已不适合,它便向其他寄主上转移。降雨对其数量消长影响最显著,干旱对其发生有利。防治上,对玉米适时灌水施肥,加强管理甚为重要;药剂防治可用40%乐果乳剂1,500倍液喷雾。

Selenothrips rubrocinctus (Giard) is an important pest of tung-oil tree Aleuritis fordii in southern China. In middle May overwintered adults begin to appear on tung-oil tree in Hunan Province and lay eggs in slits of leaves cut by ovipositor. About eight overlapping generations may occur before leaves fall. From May to October the duration of life cycle is about 20 to 30 days. Before August the population gradually grows and in the late September and October it increases sharply, soon reaching the peak, causing...

Selenothrips rubrocinctus (Giard) is an important pest of tung-oil tree Aleuritis fordii in southern China. In middle May overwintered adults begin to appear on tung-oil tree in Hunan Province and lay eggs in slits of leaves cut by ovipositor. About eight overlapping generations may occur before leaves fall. From May to October the duration of life cycle is about 20 to 30 days. Before August the population gradually grows and in the late September and October it increases sharply, soon reaching the peak, causing serious damage to host plants and reducing tung-oil production. Its population decreases rapidly thereafter in response to the lower temperature and less favorable food. Warm and dry weather favours the population growth. Population abundance in thin stand is more copious than that in thick stand. A. fordii is the most preferred host plant while A. monotana is almost immune to its attack. Raising the resistance of the tree toward the pest, rational close planting and painting the trunk with 40% Rogor in August have been proven to be effective for suppressing pest outbreak.

红带滑胸针蓟马Selenothrips rubrocinctus(Giard)为我国油桐的重要害虫。一年可发生6—8代,6—9月约20—30天完成一代。6—10月种群数量不断上升,尤以9—10月增殖幅度极大,是一年中为害最重的时期,造成早期落叶,影响碳水化合物转化为油脂,并削弱来年树势。高温干旱有利于此虫的发生,低温高湿不利其发生。三年桐是其喜食寄主,千年桐几乎是免疫的。加强桐林培育,适当密植提早郁闭及以40%乐果原液涂树干是防治此虫的可行而有效办法。

 
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