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心叶期
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  whorl stage
     Studies on the effect of European corn borer, Pyrausta nubilalis Hubner, on yield were carried out in Peking, 1963. A single cross hybrid was planted in pots in a moth-proof screen cage and manually infested with several levels of egg masses at mid-whorl stage, late whorl stage and early silking stage.
     1963年在北京防蛾网室的条件下,在盆栽春玉米上分期用人工接种螟卵,試驗螟害对产量损失的影响,得出如下的結果: 玉米产量的损失与玉米螟为害当时玉米的生育时期有密切的关系。 在螟虫数量相同或接近的情况下,心叶期(心叶中期、心叶末期)被害较穗期(灌浆期)影响产量显著为大;
短句来源
     In the past satisfactory control may be achieved by using granulated insecticides at the late whorl stage of the corn.
     过去在玉米心叶期应用颗粒剂防治已可基本控制为害。
短句来源
     The tested results on the resistance of F_1 generation to Asian Cornborer Ostrinia furnacalis(Guenée)(ACB)in whorl stage from differentcrosses of parent inbred lines possessing different capabilities of ACBresistance showed it belongs to quantitative inheritance; the resistanceof parents has accumulative effect into hybrid descendants,and the resis-tance of hybrids was high-positively correlated with the mean resis-tance of their parents.
     不同抗螟性亲本所组配的F_1代在玉米心叶期,对亚洲玉米螟 Ostrinis furnacalis(Guenée)抗性研究表明,玉米抗螟牲为数量遗传,亲本抗性在杂种后代中具有累加效应,杂种的抗性与双亲平均抗性呈高度正相关。
短句来源
     The results further certified that the corn field interplanting CTM has the AAF, which integrated inoculative release with/without interplanting single cross of corn resistant to ACB in whorl stage have good effect in controlling the ACB in corn ear stage.
     试验结果显示采用心叶期玉米抗螟品种间作匍匐型绿豆,并接种释放少量赤眼蜂等综合措施对穗期玉米螟害有明显的控制作用
短句来源
  “心叶期”译为未确定词的双语例句
     There is close relation between different sowing time and the damage of Ostrinia nubilalis (Hubner). In heart-leaf period,the best elimination effect is 4.5% beta-cypermethrin 450mL/hm 2,the next is 5% Regent 150mL/hm 2 and 50% methamidophos 450mL/hm 2.The corrective elimination effects are all over 90%.
     在心叶期进行药剂防治 ,以 4 .5 %高效氯氰菊酯EC4 5 0mL/hm2 防效最好 ,其次是 5 %锐劲特悬浮剂15 0mL/hm2 和 5 0 %甲胺磷EC4 5 0mL/hm2 ,校正防效均达 90 %以上
短句来源
     The comlimed survival rate and its standard error of both egg and larval populations was 3.4±0.51%.
     心叶期卵和幼虫的合計平均成活率及其标准誤为3.4±0.51%。
短句来源
     In seedling stage (leaf age:0 ̄8, leaf shape:cordate leaves), the rate of fiber cell differentiation was low, and the early vigorous growth stage (leaf age:9 ̄12, leaf shape:palmate 3 split) was also the early vigourous differentiation stage of fiber cells.
     苗期和旺长初期与纤维细胞的慢速分化期和旺盛分化初期相对应,分别为心叶期(0~8叶龄)和3裂叶期(9~12叶龄);
短句来源
     The relation between the insect-resistant characteristics and the secondary metabolites of sixteen maize varieties were studied through the field investigation and the laboratory biochemical analysis.
     在自然感虫条件下,对辽宁广泛种植的16个主要玉米品种进行了田间调查和室内生化分析,以研究不同玉米品种心叶期对亚洲玉米螟Ostrunia. furnacalis(Guené)é的抗性及与次生代谢物的关系。
短句来源
     The number of holes per hundred plants was 54.8, 102.6 and 277.2 in resistant single cross field interplanting CTM integrated with inoculative release, in the field without interplanting CTM and inoculative release and in the susceptible single cross field, respectively.
     心叶期抗螟品种间作匍匐型绿豆结合接种式放蜂区、心叶期抗螟夏玉米平作不放蜂和感螟品种不放蜂对照区的平均百株蛀孔数分别为54.8、102.6和277.2个,放蜂区与两个不放蜂对照区相比,对玉米螟的防效分别为46.6%和80.2%。
短句来源
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  相似匹配句对
     Chemical composition of epimedium brevicorum
     淫羊藿化学成分研究
短句来源
     Studies on Chemical Constituents of Epimedium brevicornum Maxim
     淫羊藿的化学成分研究
短句来源
     DISTRIBUTION PATTERN OF EGG MASSES OF EUROPEAN CORN BORER IN CORN FIELDS AT WHORL STAGE AND ITS PRACTICAL IMPLICATIONS
     玉米玉米螟卵块的分布型及其在实践上的应用
短句来源
     5. heart-shaped stage;
     5.形胚;
短句来源
     In the past satisfactory control may be achieved by using granulated insecticides at the late whorl stage of the corn.
     过去在玉米应用颗粒剂防治已可基本控制为害。
短句来源
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  whorl stage
Both insects feed extensively on leaves of plants in the whorl stage of growth.
      
nubilale/SAI when plants were in the mid to late whorl stage, where SAI, surface area index, is the plant surface area/m2.
      
nubilalis in those plants infested at whorl stage.
      
Stowell's Evergreen (susceptible) had a mean damage index three to six times that of Maiz Amargo (resistant) at the whorl stage and the progeny plants were more resistant than the susceptible parent.
      
County Co-op called about several whorl stage cornfields having numerous caterpillars feeding on the leaves of corn.
      
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Field plot tests on the control of the European corn borer,Pyrausta nubilalis Hubn.,withgranulated insecticides were carried out at Heng-shui,Ho-pei,during the year 1960-1961.One application of 5% DDT granules at the late whorl stage reduced the earlier borerpopulation about 80-90%,and the insecticides deposited in the leaf axils remained sufficientlyeffective for the control of those larvae hatched after tasselling.The total borer populationbrought under control by a single application was 65-77.4% on corn...

Field plot tests on the control of the European corn borer,Pyrausta nubilalis Hubn.,withgranulated insecticides were carried out at Heng-shui,Ho-pei,during the year 1960-1961.One application of 5% DDT granules at the late whorl stage reduced the earlier borerpopulation about 80-90%,and the insecticides deposited in the leaf axils remained sufficientlyeffective for the control of those larvae hatched after tasselling.The total borer populationbrought under control by a single application was 65-77.4% on corn planted in the spring and60-71.9% on corn planted in the summer.The best time for a single treatment was found tobe late whorl stage,earlier application of granules would be less effective.Double applicationsof insecticides,with the first at the late whorl stage and the second at the silking stage,weremore effective.The borer population on corn planted in spring and summer was reduced85.8-88.6% and 90.6-91:0%,respectively.No significant difference was found between formulations,dosages,and methods of applica-tion.Although the residual toxicity of 5% DDT and 0.5-1.0% γ BHC granules was found tobe well above one month,as the insecticides deposited in the leaf axils lost 85-88% of theiroriginal quantity within the same period,it is concluded that double application might benecessary espeeially when borer population is high.As the relation between amount of egg laying and the effectiveness of insectieidai applica-tion was insignificant,it is suggested that growth stage of corn can be used as the basis fortiming the insecticidal application.

1960—61连续二年在河北衡水施用颗粒剂防治玉米螟:春、夏玉米心叶末期用5% DDT 颗粒剂,不仅前期的螟虫减少了80—90%左右,穗期的螟害也适当地被控制。1次施药能减少整个春玉米生育期的虫数65—77.4%,夏玉米60—71.9%。防治效果似与玉米后期虫口密度有关。心叶期防治以在心叶末期为最理想,提早施药不能获得最高效果。心叶期防治2次与防治1次的效果没有差异。心叶末期与穗期各防治1次,收获时检查,防治效果春玉米上可达85.8—88.6%,夏玉米90.6—91%。因此,在螟害较轻的年分,防治1次即能解决大部分的螟害问题,大发生年分,可以在穗期再防治1次。试验证明不同载体、不同加工方法配制的颗粒剂、不同用量和不同施用方法的防治效果差异都不显著。虽然含5% DDT 或0.5—1%666的颗粒剂的残效能维持1个月以上,但由于田间植株上残存的颗粒剂损失很快,1个月后的残存量仅为12—15%,因此1次防治的效果受到限制。由于防治效果与施药时螟卵发生的情况关系不大,而心叶未期是防治最适时期,因此作者建议可以玉米生育阶段作为施药时期的标准。

Studies on the chemical control of European corn borer, Pyrausta nubilalis Hubner, were carried out in Liaoning province in 1958—1962. Application of 5% DDT granules or 1% γ BHC granules was found to be very effective in combating the borers infesting maize. When applied at the proper time, the above-mentioned insecticides killed 100% of the first generation larvae and reduced the total borer population by 70% and 60% respectively. Grapules could best be applied on the late whorl stage, or on the date 20—25...

Studies on the chemical control of European corn borer, Pyrausta nubilalis Hubner, were carried out in Liaoning province in 1958—1962. Application of 5% DDT granules or 1% γ BHC granules was found to be very effective in combating the borers infesting maize. When applied at the proper time, the above-mentioned insecticides killed 100% of the first generation larvae and reduced the total borer population by 70% and 60% respectively. Grapules could best be applied on the late whorl stage, or on the date 20—25 days after the first appearance of egg mass in the field, or near the end of the oviposition period of the first generation. A single application of granules at late whorl stage was sufficient and an additional application before this period proved to be unnecessary. Insecticides prepared by thoroughly mixing the toxicant with the carrier before making granules were found to be superior to those prepared by merely mixing the toxicant with the granules. Control borers infesting millet with a mixture of 5% DDT dust and 0.5% γ BHC dust on a ratio of 1: 1 was highly effective. The best time to apply insecticide was during the oviposition peak, which generally appeared about 15—20 days after the appearance of the first egg mass in the field. A mortality of 70—80% was expected when the dust was applied to the lower portion of the plants.

1958—1962年在辽宁省新金、辽中及沈阳三地,对为害玉米及谷子的玉米螟进行了化学防治試驗。試驗証明:玉米心叶末期或田間初見卵后20—25天,或田間第一代螟卵接近绝跡时均可作为辽宁地区进行化学防治适期的标准。用5%DDT或1%六六六顆粒剂适期施药,对第一代玉米螟都有100%效果。于玉米收获前剖查,經5%DDT与1%六六六顆粒剂处理后,減虫率分別为70%以上和60%以上。心叶期增加施药次数并不能增加防治效果。从顆粒剂的加工方法来看,混和顆粒剂优于拌粉顆粒剂。谷子上化学防治的适宜时期,为田间初見卵后15—20天,相当于第一代卵高峯或卵高峯后3—5天。用5%DDT、0.5%六六六1∶1混合粉剂,每亩4斤施于谷子茎基部,一次施药,可得70—80%以上的防治效果。

Studies on the effect of European corn borer, Pyrausta nubilalis Hubner, on yield were carried out in Peking, 1963. A single cross hybrid was planted in pots in a moth-proof screen cage and manually infested with several levels of egg masses at mid-whorl stage, late whorl stage and early silking stage. Yield reduction was found to be affected by the developmental stages of corn, at which infestations were being made. The reduction it_ yield of corn infested at whorl stages was greater than that of early siIking...

Studies on the effect of European corn borer, Pyrausta nubilalis Hubner, on yield were carried out in Peking, 1963. A single cross hybrid was planted in pots in a moth-proof screen cage and manually infested with several levels of egg masses at mid-whorl stage, late whorl stage and early silking stage. Yield reduction was found to be affected by the developmental stages of corn, at which infestations were being made. The reduction it_ yield of corn infested at whorl stages was greater than that of early siIking stage. Corn infested at late whorl stage suffered significantly more loss than that of mid-whorl stage. Reduction in yield in all treatments, except those infested at early silking stage, was significant when compared with the check plots. The difference in yield due to variation in time of infestation was much more prominent than that caused by difference in borer population of a particular infestation time. The correlations between borer population and yield in those treatments infested at mid-whorl stage and early silking stage were statistically significant. For every additional borer per plant, a yield reduction of 3.17% was calculated in corn infested at mid-whorl stage, and 1.84% finro that of early silking stage. The authors point out that the current recommendation for borer control with granulated insecticide at late whorl stage not only proves to be effective in reducing the borer population, but also seems to be profitable from the point of view of crop yield.

1963年在北京防蛾网室的条件下,在盆栽春玉米上分期用人工接种螟卵,試驗螟害对产量损失的影响,得出如下的結果: 玉米产量的损失与玉米螟为害当时玉米的生育时期有密切的关系。在螟虫数量相同或接近的情况下,心叶期(心叶中期、心叶末期)被害较穗期(灌浆期)影响产量显著为大;心叶末期孵化的螟虫,其为害所造成的損失又显著较心叶中期为大。心叶期被害的处理,产量較对照区显著減低,但穗期被害的处理,每株平均虫数为3.5—15.1时,产量仍与对照差异不显著。同一接种时期,处理間平均虫数的差异大部分是显著的,但产量間的差异則不显著。玉米受害时期对产量的影响远較同一时期不同虫量的影响为明显。虫数与心叶中期和穗期接种的两个处理的产量有显著的負相关,相关系数分別为-0.89和-0.88;虽然产量随着虫数的增加而递減的趋势是明显的,但每株虫数在1—12头的范围內,产量间差异不一定显著。虫数与心叶末期接种的处理的产量,相关不显著,这可能是由于供試株数太少的原因。应用迴归方程式計算时,每增加一虫产量的損失,心叶中期为3.17%,穗期为1.84%。接种后被害玉米发育受到影响,心叶期遭受螟害植株高度減低17%。...

1963年在北京防蛾网室的条件下,在盆栽春玉米上分期用人工接种螟卵,試驗螟害对产量损失的影响,得出如下的結果: 玉米产量的损失与玉米螟为害当时玉米的生育时期有密切的关系。在螟虫数量相同或接近的情况下,心叶期(心叶中期、心叶末期)被害较穗期(灌浆期)影响产量显著为大;心叶末期孵化的螟虫,其为害所造成的損失又显著较心叶中期为大。心叶期被害的处理,产量較对照区显著減低,但穗期被害的处理,每株平均虫数为3.5—15.1时,产量仍与对照差异不显著。同一接种时期,处理間平均虫数的差异大部分是显著的,但产量間的差异則不显著。玉米受害时期对产量的影响远較同一时期不同虫量的影响为明显。虫数与心叶中期和穗期接种的两个处理的产量有显著的負相关,相关系数分別为-0.89和-0.88;虽然产量随着虫数的增加而递減的趋势是明显的,但每株虫数在1—12头的范围內,产量间差异不一定显著。虫数与心叶末期接种的处理的产量,相关不显著,这可能是由于供試株数太少的原因。应用迴归方程式計算时,每增加一虫产量的損失,心叶中期为3.17%,穗期为1.84%。接种后被害玉米发育受到影响,心叶期遭受螟害植株高度減低17%。作者等指出心叶末期孵化为害的螟虫影响玉米产量特别严重的原因,可能是由于玉米抽雄时,这批幼虫尚未成熟,大量轉移蛀入茎稈或为害正在成长中的雌穗,妨碍营养物的輸送和雌穗的正常受粉所致。本文試驗所得的結果,初步指出当前用颗粒剂防治玉米螟,提倡在心叶末期施药的措施,不仅从減少虫数上看是适当的,从保証产量的角度来看也是有利的。

 
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