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predators
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  天敌
    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。
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    Research on Predators of Rodent Pests in Jinghe Desert Forest
    精河县荒漠林鼠害天敌调查报告
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    natural enemy species of Chinese diprionid sawflies are recorded, 24 species of which are parasitoids, 22 species of which are predators, 6 species are virus and fungi The effects of the natural enemies on the sawflies and the dynamics of the sawflies are discussed.
    本文记述了我国松叶蜂类昆虫天敌52种,其中寄生性天敌24种,捕食性天敌22种,病菌6种。
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    The results showed that there are 13 families, belonging to 31 species, of which the spider numberis the largest, and the second is at There existed difference on the species and number of predators in differentyears and generations in the various forest types, especially the number.
    结果表明低龄幼虫期捕食无敌有13科31种,其中以蜘蛛类最多,其次为蚂蚁类。 不同林型中捕食天敌的种类和数量在年份间代别间均存在一定差异,数量差异尤其显著。
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    オ? The research was carried out by investigating number of predators and predation capabilities along with mortalities of the pine bast scale (Matsucoccus liaoningensis Tang) inside sampling plot, and by applying the K-value graphic analysis method.
    采用样方内各种捕食天敌数量与其捕食量引起辽宁松干蚧MatsucocusliaoningensisTang1)死亡数的调查统计法、K-值图解分析法,研究了辽宁松干蚧捕食天敌的作用。
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  “predators”译为未确定词的双语例句
    in December was highest, 0.9974. The relative abundance of predators was 0.0275, the value during April to December was 0.0025-0.3371;
    捕食类总群落相对丰盛度为0.0275,4-12月为0.0025-0.3371,12月最低,为0.0025。
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    27 species of predators repesentiang 15 families;
    捕食类27 种,分属于15科;
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    The relative abundance ofphytophages and predators were 97.6% and 2.85% respectively.
    植食类的相对丰盛度为96.7%,捕食类相对丰盛度为2.85%。
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    Seed predation rate of C. intermedia was relatively low and differed with microhabitats: 100% in shrub lands, 85.0%±10.0 in grasslands, and 31.0%±8.7% in open land. Seed predators greatly reduce seed quantity, seed dispersal and germination rate of C.
    中间锦鸡儿种子被取食率则因微生境的不同而不同:在灌丛下被取食率为100%,在半阳坡的开阔草地上为85.0%±10.0%,在种植植物未成功的水平阶地上为31.0%±8.7%,且取食速度相对较慢。
短句来源
    Predators of larvae of Dendrolimus punctatus (Walker) and their predation
    马尾松毛虫幼虫的捕食天敌及其捕食作用的研究
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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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The locust, Hieroglyphus tonkinensis I. Bol., is a major pest of bamboo. This paper reports the results of our studies, from 1980 to 1981, on the biological characteristics and control measures of this pest. This insect has one generation per year in Guangzhou and Zhanjiang of Guangdong province. It passes the winter by laying eggs in the soil. The nymphs hatch from early April to early May, and usually have 6-7 instars. The adults appear from early June to early August and die between mid-august and mid-October....

The locust, Hieroglyphus tonkinensis I. Bol., is a major pest of bamboo. This paper reports the results of our studies, from 1980 to 1981, on the biological characteristics and control measures of this pest. This insect has one generation per year in Guangzhou and Zhanjiang of Guangdong province. It passes the winter by laying eggs in the soil. The nymphs hatch from early April to early May, and usually have 6-7 instars. The adults appear from early June to early August and die between mid-august and mid-October. It is found through a field survey that the locust has six natural enemies, including fungi and predators. The effective control measure of this pest is to spray with Trichlorphon, Dichorvos and Malathion.

异歧蔗蝗(Hieroglyphus tonkinensis I. Bol.)属直翅目、蝗科(Locustldae),以蝗蝻和成虫取食竹叶,是竹林的一种较重要的害虫。在广东广州和湛江地区一年发生一代,以产于土中的卵块越冬。翌年4月上旬孵化。蝗蝻6—7龄。6月上旬开始羽化,羽化后12—28天交尾,交尾后6—10天产卵。成虫于8月上、中旬—10月中旬相继死亡。已采集的天敌共6种,包括捕食性天敌5种,真菌1种。其中最重要的天敌是蝗霉,6—7龄蝗蝻的自然发病死亡率达52%。用90%敌百虫晶体10,000或20,000倍液、80%敌敌畏乳剂20,000倍液、50%马拉松乳剂10,000倍液对幼蝻进行防治有良好效果。

The life cycling and biological characteristics of Pristiphora erichsonii (Hartigi) were observed in this study. This pest has one generation a year in Jixi region, Heilongjiang. The old instar larvae with cocoon start overwintering under litter(3-5 cm in depth) from the second ten days of August. Pupating starts in June of next year, with a peak in the second days of July, and ends in the first ten days of August. The emergence starts in the second ten days of June, with a peak in the second days of July,...

The life cycling and biological characteristics of Pristiphora erichsonii (Hartigi) were observed in this study. This pest has one generation a year in Jixi region, Heilongjiang. The old instar larvae with cocoon start overwintering under litter(3-5 cm in depth) from the second ten days of August. Pupating starts in June of next year, with a peak in the second days of July, and ends in the first ten days of August. The emergence starts in the second ten days of June, with a peak in the second days of July, and ends in the second ten days of August. Adults begin to oviposit from the last ten days of June, with a peak in the second ten days of July, and stop laying egg from middle of August. The egg's period last about 6 days and begin to hatch in the first ten days, with a hatching peak in the last ten days of July. Larva has five instar. The female and male is in a ratio of 20∶1. 6% individuals of P. erichsonii have a phenomenon of delaying development. The investigation on natural enemy of this pest was also made. Eight species of parasitoids, 1 species of fungus and 2 species of predator ant were found in this area.

落叶松叶蜂Pristiphoraerichsoni(Hartigi)在黑龙江省鸡西地区1年1代。8月中旬以茧内老熟幼虫在枯枝落叶层3~5cm表土层下越冬。翌年6月初开始化蛹,7月中旬为盛期,8月上旬结束。6月中旬成虫开始羽化,7月中旬为盛期,8月中旬结束。成虫于6月下旬产卵,7月中旬为盛期,8月中旬结束,卵期平均6d。卵于7月上旬开始孵化,7月下旬为盛期。幼虫共5龄,雌雄比20∶1,该虫6%的个体有滞育现象。寄生性天敌昆虫有7种,虫生真菌1种,捕食性蚂蚁2种。

Studies in 1992~1995 show that the key factor influencing the population dynamics of Neodiprion xiangyunensis is its mortality in pupal stage,i.e.the function of natural enemies. The larvae can give off a substance called “altruism hormone” to prevent themselves from preying by predators,so there is scarcely any influence of predation on its population. The main factor influence the motality of larvae is temperature. Usually the higher ...

Studies in 1992~1995 show that the key factor influencing the population dynamics of Neodiprion xiangyunensis is its mortality in pupal stage,i.e.the function of natural enemies. The larvae can give off a substance called “altruism hormone” to prevent themselves from preying by predators,so there is scarcely any influence of predation on its population. The main factor influence the motality of larvae is temperature. Usually the higher the altitude,the higher the mortality,but when at the same altitude,the motality in sunny orientation is greater than that in shady orientation. Due to its feeding habits and high resistance to the natural enemies,the pest can cause great damages within several years once occurred.

1992~1995年对祥云新松叶蜂的种群动态进行了研究,结果分析表明,影响种群动态的主导因子是茧期死亡率,茧期死亡主要由天敌引起。由于祥云新松叶蜂幼虫具有驱赶天敌的利己激素,捕食性天敌昆虫对幼虫不能产生明显的控制作用。影响幼虫期死亡率的主要因子是温度。通常死亡率低海拔大于高海拔,同一海拔阴坡大于阳坡。由于祥云新松叶蜂危害云南松老叶,且对天敌抵抗力强,具有持续数年危害的特点

 
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