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第二寄主
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  “第二寄主”译为未确定词的双语例句
     2.In nature, many species of insects, including some common forest defoliationpest insect, are the second hosts of Chouioia cunea Yang.
     2.白蛾周氏啮小蜂在自然界中的第二寄主种类较多,包括一些常见的林木食叶害虫;
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     The second issue is explanation of crime of disrupting the orde
     第二
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     Second, the coursingcase of 1999~ 2000 and January?
     第二
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     E.
     2的寄主 E.
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     Cuscuta spp have wide ranges of host.
     菟丝子属植物的寄主广泛。
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  secondary host
The two subspecies of the host-alternating black bean aphid, Aphis fabae Scopoli, used in this study have different secondary host plants but reproduce sexually in autumn on the same host plant, spindle, Euonymus europaea L.
      
Secondary host choice by the autoparasitoid Encarsia pergandiella
      
In this study we examined the secondary host selection behaviour of this species with regard to conspecific females and females of two thelytokous species, E.
      
Hyperparasitism by an exotic autoparasitoid: secondary host selection and the window of vulnerability of conspecific and native
      
However, E.?pergandiella parasitized either of these heterospecific hosts more frequently than conspecific hosts in treatments including two secondary host species.
      
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The life cycle of spirea aphid is holocyclogency and belongs to migration type.There are

1987和1988年两年的研究发现,绣线菊蚜在苹果园内的生活周期(?)芷谇惹(?)健HNO 暧小迹冢龋ā剑创吻ǔ筛叻澹(?)植荚冢丛碌住ⅩⅥ翟轮邢旬、7月中下旬和9月中旬以后。4月底的第1次迁飞高峰是越冬虫源引起的,只有越冬卵密度较大的果园才形成此迁飞高峰,主要在果园内外扩散蔓延;5月中下旬和7月中下旬的迁飞高峰期恰好分别与苹果春梢和秋梢的生长停滞期相吻合,主要迁向第二寄主;9月中旬以后有翅产雌性母和雄性蚜相继大量迁入果园,形成第4次迁飞高峰。

The researches based on artificial inoculation and field investigation for the frist time indicate that pear ( Pyrus spp.) is secondary host of Eriosoma lanuginosum dilanuginosum (Zhang,1980).The life history belongs to heteroceous holocycle type.From the midde of May to the middle of June alate fundatrigeniae fly and migrate to the pear and apterous viviparous female do the damage to the thin root of the pear.From the begining of October to the beginning of November sexuparae fly and migrate to the elm...

The researches based on artificial inoculation and field investigation for the frist time indicate that pear ( Pyrus spp.) is secondary host of Eriosoma lanuginosum dilanuginosum (Zhang,1980).The life history belongs to heteroceous holocycle type.From the midde of May to the middle of June alate fundatrigeniae fly and migrate to the pear and apterous viviparous female do the damage to the thin root of the pear.From the begining of October to the beginning of November sexuparae fly and migrate to the elm ( Ulmus spp.) and produce the sexuales of female and male.After mating the female sexuales lay an egg.The eggs hibernate.In spring the fundatrix, apterous fundatrigeniae and alate fundatrigeniae damage the leaves on the elm and produce pseudogalls.

通过人工接种和田间调查,首次发现榆绵蚜的第二寄主是梨树,并确定榆绵蚜营异寄主全周期生活,5月中旬至6月中旬,榆绵蚜以有翅干雌蚜迁飞到梨园,在梨树根稍产无翅孤雌侨蚜为害;10月初至11月初,又以性母蚜迁飞到榆树上产雌雄性蚜,交配后雌蚜产卵越冬;春季干母、无翅干雌、有翅干雌为害榆叶形成伪虫瘿。

 
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