| 棉苗黑斑病的发生条件及其防治途径 |
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| 引用本文： | 李君彦,仇元.棉苗黑斑病的发生条件及其防治途径[J].植物保护学报,1963,2(2):195-204. |
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| 作者姓名： | 李君彦 仇元 |
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| 作者单位： | 西北农学院,西北农学院 |
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| 摘 要： | 棉苗黑斑病的致病菌在关中棉区初步认为是 Alternaria tenuis Nees 与棉成株期叶片上的致病菌不同。病菌孢子借气流传布。种子带菌率虽然很高,但诱发苗病率却很低,因此,种子消毒或采用轮栽来控制这个病害,是不能达到预期效果的。病害发生与棉苗受冻、强风对棉苗的伤害以及棉苗阶段发育有密切的关系。各年发病期有早有晚,但以真叶出现时为易感阶段。本文阐述了棉苗生育阶段、气候条件与发病的关系,为预测病害发生的物候与气象参考条件提供了资料。棉株伤害与发病有关系,建议在生产上适当降低播种量,提高播种质量,适期早疏苗、早间苗;以减轻由于伤损而导致病害侵染。品种与病害发生的关系不显著。试验证明,使用波尔多液加1059于降温前喷射效果较好。
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STUDIES ON THE CONDITIONS FOR INCIDENCE OF COTTON SEEDINGS BLACK SPOT AND METHODS FOR ITS CONTROL |
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| Lee Cheun-yen and Chiu Yuen.STUDIES ON THE CONDITIONS FOR INCIDENCE OF COTTON SEEDINGS BLACK SPOT AND METHODS FOR ITS CONTROL[J].Acta Phytophylacica Sinica,1963,2(2):195-204. |
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| Authors: | Lee Cheun-yen and Chiu Yuen |
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| Abstract: | Black spot of cotton seedlings caused by Alternaria tenuis Nees.Formerly designated as "zenate leaf spot" is differentiated from the true zonate leaf spot of cotton caused by A.macrospora Zimm.The former appears on the cotyledons and the young true leaves as irregular brownish-black spots which then covered with olivaceous sporulations with a few inconspicuous zonations,while the later occurs most prevalent in the late autumn as circular brown spot with several zonations.Owing to the fact that spores of this pathogen was disseminated by air current,the seed treatment or crop rotation alone,was not sufficient to attain satisfactory control.The disease development was closely correlated with chilling and wind injuries of the seedlings and also with growth-stage of the plant.The date of disease incidence varied with years and was apparently influenced by the climatic factors.This correlation suggested the possibity for prognosis.It was suggested that for avoiding the chilling and wind injuries in the seedling stage,an adequate early thining was to be scheduled.The varietal difference in resistance to this disease was not significant.However it was demonstrated that,the application of a mixture of Bordeaux mixture and E1059 before the temperature lowering,yielded a fair result. |
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