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damage to cotton
相关语句
  危害棉花
     The most of the 3rd generation transferred to cotton filed became the mainly damage to cotton.
     3代期大多数转移到棉田为害 ,成为危害棉花的主害代次。
短句来源
  对棉花为害损失
     DAMAGE TO COTTON AND ECONOMIC THRESHOLD OF THIRD GENERATION COTTON BOLL WORM IN NORTHERN CHINA COTTON AREA
     华北棉区第三代棉铃虫对棉花为害损失与经济阈值的研究
短句来源
  “damage to cotton”译为未确定词的双语例句
     Analysis of Damage to Cotton Fabrics After Sodium Hypochlorite Bleaching
     次氯酸钠漂白后棉织物损伤情况的分析
短句来源
     Analysis on the Chilling Damage to Cotton in Shihhotze,Xinjiang
     2006年5月上旬新疆石河子棉区低温危害分析
短句来源
     In China, cotton blight and cotton verticillium wilt (causative pathogen Verticillium dahliae) are especially severe and cause serious damage to cotton production annually.
     陆地棉是我国棉花的主栽品种,陆地棉抗枯萎病育种非常成功,但黄萎病抗病品种的培育一直是育种家的一大难题,主要原因在陆地棉中找不到免疫或高抗的黄萎病抗源。
短句来源
     The experiment of low temperature treat with cotton seedling, proves that INA bacteria could aggravated the damage to cotton on the condition of low temperature, when cotton seed emerges 2-3days with 3℃-10℃
     通过低温处理实验, 研究INA和低温对棉花苗期烂种、烂根危害作用机理,验证了INA细菌在低温情况下加重了对棉花的危害,并且明确了棉花在播种2-3天时遇低温强度值在3℃-10℃时最易受棉花立枯丝核菌侵染,对棉花烂种、烂根的危害最重
短句来源
     Every year virus and pests cause serious damage to cotton production.
     但是棉花生产由于长期受到病虫害的危害,棉花的产量和品质受到严重影响。
短句来源
更多       
  相似匹配句对
     and cotton's ability to compensate for damage is limited.
     棉花受害后自我调节补偿能力有限。
短句来源
     Study on the damage of the cotton plant-bug to cotton
     棉盲蝽对棉花的危害研究
短句来源
     And with the cotton roots,the G.
     G.
短句来源
     Rail Damage
     钢轨破损
短句来源
     On Construction Damage
     施工索赔研究
短句来源
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  damage to cotton
Variation in damage to cotton affecting larval feeding preference of Spodoptera littoralis
      
For instance, cotton leaf curl disease in Pakistan became severe during the past decade, causing extensive damage to cotton production.
      
A number of other insects that are not controlled by the Bt gene also cause significant damage to cotton every year.
      


In the vicinity of shanghai, the damage to cotton caused by the Asiatic Corn Barer has been increasing during recent years and in many places has surpassed that of the pink boll worm, the major pest of cotton in Shanghai area. For the efficient use of chemical control, it is necessary to estimate the yield loss due to it's damage and establish it's economic threshold.These experiments were conducted during 1977~1979, including establishing the relationship between the number of egg masses per...

In the vicinity of shanghai, the damage to cotton caused by the Asiatic Corn Barer has been increasing during recent years and in many places has surpassed that of the pink boll worm, the major pest of cotton in Shanghai area. For the efficient use of chemical control, it is necessary to estimate the yield loss due to it's damage and establish it's economic threshold.These experiments were conducted during 1977~1979, including establishing the relationship between the number of egg masses per 100 plats and the number of damaged plants per 100 plants, determining the yield loss of damaged plants and the compensatory effect of the normal plants immediately surrounding the damaged plant.According to the experimental data, the economic thresholds for the 1st, 2nd and 3rd generations were calculated to be 2.2-2.8, 0.9-1.1 and 3.1 egg masses per 100 plants respectively.The suggested economic thresholds were verified during the growing season at six diffrent places in 1979 by field experiments and the results showed that these economic thresholds were acceptable.

通过玉米螟卵量与棉花被害株、被害铃关系的研究以及被害所造成产量损失的调查,根据经济阈值推算出以百株卵量表示的防治指标。玉米螟卵量(x)与被害株数(y)、被害铃数(n)呈正相关,关系式第1代为:y=1.49x-0.22,第2代为:y=3.47x+0.21,第3代为:n=3.25x+1.2。被害株损失青铃数,第1代为4.36±0.55只,第2代为3.41±0.30只。但与受害株相邻的健株铃数多于一般健株。用药一次每亩成本150元,防治效果为70%,推算出的防治指标为:第1代百株卵量2.2~2.8块,第2代0.9~1.1块,第3代3.1块。经多点大田验证,试验结果与实际情况基本相符。

In 1983 and 1984,simultaneous simulations of the feeling amounts of cotton bollworm,Heliothis armigera(Hbn.)were carried out in cotton fields of Qiliying,Xinxiang County,Henan Province,to determine its damage to cotton in three aspects:the larval densities,the generation of bollworm,and the fertility levels of cotton fields.The conclusions were as follows: 1,There were enough time for the cotton to compensate its loss of squares caused by the second generation infestations.When the damage...

In 1983 and 1984,simultaneous simulations of the feeling amounts of cotton bollworm,Heliothis armigera(Hbn.)were carried out in cotton fields of Qiliying,Xinxiang County,Henan Province,to determine its damage to cotton in three aspects:the larval densities,the generation of bollworm,and the fertility levels of cotton fields.The conclusions were as follows: 1,There were enough time for the cotton to compensate its loss of squares caused by the second generation infestations.When the damage was within a definite level,no yield loss would occur,and the yield might even increase if the damage was slight.However,the compensation ability of cotton decreased conspicously as the plants grew,and the squ- are loss became incurable in case a considerable damage of third genera- tion might take place and thus caused a more serious yield reduction than the second generation did. 2,During the second generation infestations,the tolerance of cott- on plants grown in fields of different fertility levels differed significan- tly.The yield loss in high fertility fields was small or none,as compared with a highest loss at the low fertility fields. 3,Covariance analyses of larval densities(natural logarithm)and percentage reduction in yield indicated that:the difference between years was negligible;the “a” values of regression equations of second genera- tion infestation at three different fertility levels differed significantly, While “b” values were not;no conspicuous differences among the regres- sion lines of the third generation infestation(including a slight second generation infestation)at different fertility levels were found. Based on the results mentioned above,the three regression equations obtained were as follows. y_1=-14.59565+4.21216lnx±2.5 y_2=-9.82564+4.21216lnx±2.5 y_3=-13.56878+7.04572lnx±3.7 where y_1,y_2,y_3 and x represented the percentage reduction in yield of second generation infestation at high fertility level,second generation infestation at medium fertility level,third generation infestation(inclu- ding a slight second generation infestation),and larval densities per 100 plants,respectively;and the Economic Thresholds calculated from these equations were 36,12,and 8 larvae(prior to its fourth instar)per 100 plants,respectively.

1983、1984两年在河南新乡七里营从不同虫量、不同世代、棉花不同肥力水平三个方面,采用同步人工模拟的方法研究了棉铃虫对棉花的危害,明确了下面几点:1.据田间定期调查统计,每头二代幼虫约危害10~13个蕾,0.5~0.6个顶尖,每头三代幼虫约危害8~9个蕾,0.3朵花,2.5~2.9个铃。被害蕾全部脱落,被害顶尖不能继续生长,被害部以下长出疯条,蕾铃数大减。部分被害铃霉烂甚至脱落,另一部分仅蛀食部位受损。2.二代棉铃虫危害期棉株受害后有足够的时间补足失去的棉蕾。在一定受害程度内不引起减产,轻度受害甚至增产。受害超过限度,因补偿棉蕾数不足,秋桃比例增加而减产。三代棉铃虫危害期棉株的补偿能力已大为下降,减产比二代棉铃虫引起的严重。3.二代棉铃虫为害期,不同肥力水平的棉花对幼虫危害的忍受力有显著差异。肥力水平高的补偿能力强,减产少或不减产。反之,肥力水平差的棉田受害后减产重。4.由虫量(自然对数)损失率回归线间的协方差分析表明:两年重复试验之间无显著差异;二代三个肥力水平之间 a 值差异显著、b 值差异不显著;二代低产及三代三个肥力水平之间无显著差异。得到下面三个回归方程:(?)=-14.59565+4.2121...

1983、1984两年在河南新乡七里营从不同虫量、不同世代、棉花不同肥力水平三个方面,采用同步人工模拟的方法研究了棉铃虫对棉花的危害,明确了下面几点:1.据田间定期调查统计,每头二代幼虫约危害10~13个蕾,0.5~0.6个顶尖,每头三代幼虫约危害8~9个蕾,0.3朵花,2.5~2.9个铃。被害蕾全部脱落,被害顶尖不能继续生长,被害部以下长出疯条,蕾铃数大减。部分被害铃霉烂甚至脱落,另一部分仅蛀食部位受损。2.二代棉铃虫危害期棉株受害后有足够的时间补足失去的棉蕾。在一定受害程度内不引起减产,轻度受害甚至增产。受害超过限度,因补偿棉蕾数不足,秋桃比例增加而减产。三代棉铃虫危害期棉株的补偿能力已大为下降,减产比二代棉铃虫引起的严重。3.二代棉铃虫为害期,不同肥力水平的棉花对幼虫危害的忍受力有显著差异。肥力水平高的补偿能力强,减产少或不减产。反之,肥力水平差的棉田受害后减产重。4.由虫量(自然对数)损失率回归线间的协方差分析表明:两年重复试验之间无显著差异;二代三个肥力水平之间 a 值差异显著、b 值差异不显著;二代低产及三代三个肥力水平之间无显著差异。得到下面三个回归方程:(?)=-14.59565+4.21216lnx±2.5(?)=-9.82564+4.21216lnx±2.5(?)=-13.56878+7.04571lnx±3.7y_1、y_2、y_3分别代表高产二代、中产二代、三代(包括低产二代)的损失率,x 为百株虫量。由此得出高产地二代防治指标是36头/百株;中产地二代防治指标是12头/百株;三代及低产二代下方治指标是8头/百株。

The Fusarium wilt is a vascular disease of cotton.A large number of microconidia were formed in the vessels.The quantities of microconidia formed in the stem and cotyledon nodes were more than those in the main roots and hypocolyls,while a few microconidia were formed in the growing points and petioles of cotyledons.There were many macroconidia formed on the surface of the infected cotton plants and certain cells of the macroconidia are able to form chlamydospores were observed.The pathogen might produce microconidia,chlamydospores...

The Fusarium wilt is a vascular disease of cotton.A large number of microconidia were formed in the vessels.The quantities of microconidia formed in the stem and cotyledon nodes were more than those in the main roots and hypocolyls,while a few microconidia were formed in the growing points and petioles of cotyledons.There were many macroconidia formed on the surface of the infected cotton plants and certain cells of the macroconidia are able to form chlamydospores were observed.The pathogen might produce microconidia,chlamydospores and a few macroconidia when cultured on the PDA selective medium.It necessatates specified nutrients and ecological conditions to produce macroconidia.The microconidia which can be formed both in the vessels and on the surface of infected plants,often caused more serious damage to cotton plants owing to the quantity and higher adoptability of the microconidia.

棉花枯萎病是一种维管束病害,此病菌在导管中产生大量小分生孢子,小分生孢子在茎中部及子叶节产生较多,其次主根及下胚轴,病子叶柄与生长点较少。棉株随着病情的加重,病导管中孢子数量随之减少。病棉株体表可产生很大数量大分生孢子,并由大分生孢子某些细胞形成厚垣孢子。用 PDA 或选择性培养基培养能产生小分生孢子、厚垣孢子,或数量有限的大分生孢子。体内外部较易产生小分生孢子,而且数量也大。而大分生孢子则需求特定的营养及生态条件才能产生。

 
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