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    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%。
    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
    DISTRIBUTION PATTERN OF EGG MASSES OF EUROPEAN CORN BORER IN CORN FIELDS AT WHORL STAGE AND ITS PRACTICAL IMPLICATIONS
    玉米心叶期玉米螟卵块的分布型及其在实践上的应用
    PRELIMINARY STUDIES ON THE INHERITANCE OF INBRED LINES RESISTANT TO ASIAN CORN BORER IN WHORL STAGE OF MAIZE
    玉米自交系心叶期对亚洲玉米螟抗性遗传规律的研究初报
    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;
    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.
    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%。
    On the basis of these equations, it is calculated that this egg mass count corresponds to a frequency index of 21% or a number of 6 egg masses per 100 plants at the peak of egg deposition.
    根据心叶期百株累計卵块数与累計着卵株百分率或百株高峯卵块数之間存在的相关,百株累計24块卵,相当于累計着卵株率28%,或百株高峯卵块6块。
    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。
    in the whorl-stage reduced, the population of ACB by 90.5-91,6%. Field applications of the spray, dust, and granules on atotal area of 800 ha.
    用2.5×10~4亿孢子/亩剂量,在玉米心叶期防治一次,玉米螟幼虫可减少90.5~91.6%。
    4 and 12 egg masses per 100-plant for Zhongdan No. 2 at the whole and the silking stages, respectively.
    感虫品种中单2号心叶期和穗期百株累计卵量均为12块。
    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。
    Based on the level of corn yields 4500kg/h,the,diseased plants could be decreased22% when"Jing gang met su "was sprayed and diseased leaves were pick off during thecentral leaf stage.
    进而计算出在目前公顷单产4500kg的玉米田,采用摘除病叶加喷施井岗霉素防治时,其防治指标为心叶期病株率的22%。
    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);
 

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