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危害时期
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  “危害时期”译为未确定词的双语例句
     during maturing stage. The damage degree and spatial distribution has significant difference between Biqi and Dongkui,two different Myrica rubra cultivars.
     果蝇对杨梅发生危害时期较早,杨梅生长中后期,果实肉质生硬,味酸稍甜时即被果蝇取食危害,随着杨梅的不断成熟,危害加剧,且果蝇对不同杨梅品种的危害程度和空间分布存在显著差异。
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     Second chapter, Song Dynasty time flood characteristic and harm.
     第二章,宋朝时期水灾特征及危害
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     The deadly factor of fire period endangers the research of time
     火灾时期致命因素危害时间的研究
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     The Harm of Ozone
     臭氧的危害
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     TATIC ELECTRICAL HAZARD AND ITS PREVENTION
     静电的危害及预防
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     Gradual adjustment period;
     逐步调整时期
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The relationship between temperature conditions and the output of

本文分析了东北区温度条件与粮豆作物产量的关系,在此基础上论述了作物冷害的原因、特点、类型、危害时期及其指标;分析了东北区作物冷害的地域分布及其历史演变规律;提出了调整作物及其品种布局、以及品种合理搭配等抗御冷害战略措施;最后提出东北区粮豆作物产量预报的统计模式。

The tobacco budworms, Heliothis assulta (Guenee) is occurred five generationt a year inuorthern Hunan. Its first to fourth generation harms tobacco and the fifth eatting on other crops.Under field condition, it has been relatively marked overlapping genetations. In first generation fromlast ten days of May to last ten days of June is the largest amount of larvae and period of seriousdamages. We have also studied the occurrence time, duration, developmental zero and effective accumulative temperature of tobacco...

The tobacco budworms, Heliothis assulta (Guenee) is occurred five generationt a year inuorthern Hunan. Its first to fourth generation harms tobacco and the fifth eatting on other crops.Under field condition, it has been relatively marked overlapping genetations. In first generation fromlast ten days of May to last ten days of June is the largest amount of larvae and period of seriousdamages. We have also studied the occurrence time, duration, developmental zero and effective accumulative temperature of tobacco budworms for each generation.

烟青虫在湘北烟区1年发生5代,第一至四代危害烟草,第五代在其他作物上取食。自然条件下,世代重叠比较明显,幼虫发生与危害最大的是第一代,危害时期是5月下旬至6月下旬,同时,还得出了烟青虫各代的发生期、历期及其发育起点温度和有效积温。

There are mainly three deseases and three pests for scallion. Aphids and Alternaria porri emerge early in a year, it being mostly in late March and late May respectively. Bradysia odrphaga and Pseudo peronospora cubensis damage heavily during mid-March and mid-May, effected greatly by the rainfall. Thrips tabaci lindeman's occurs from mid-March to late April, then descreased by the rainfall. Erwinia carotovora pv. Carotovora Dye outbreaks in late April, influencing before Scallion is harvested. The ecological...

There are mainly three deseases and three pests for scallion. Aphids and Alternaria porri emerge early in a year, it being mostly in late March and late May respectively. Bradysia odrphaga and Pseudo peronospora cubensis damage heavily during mid-March and mid-May, effected greatly by the rainfall. Thrips tabaci lindeman's occurs from mid-March to late April, then descreased by the rainfall. Erwinia carotovora pv. Carotovora Dye outbreaks in late April, influencing before Scallion is harvested. The ecological regulation techniques is spiders. Meanwhile highly effective, low-toxic and short residue pesticide is necessary to timely use.

头主要病虫为"三虫三病"。蚜虫和紫斑病发生时间早,主要在3月下旬和5月下旬发生;霜霉病和韭蛆危害时期为3月中旬至5月中旬,受雨量影响大;葱蓟马在雨季前的3月中旬至4月下旬发生重,随后受雨量影响下降;基腐病从4月下旬开始流行,一直到收获仍有不同程度发生。生态调控技术是指以合理轮作、选用抗性品种、加强健身栽培、保护利用蜘蛛等农业措施防治为主,辅以对口的高效低毒低残留农药适时防治。

 
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