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Provedor de dados:  Taiwan Agricultural Research Institute
País:  Taiwan
Título:  EFFECTS OF HOST VARIETY, PLANT MATURITY, SOIL TEMPERATURE, AND SOIL MOISTURE ON THE SEVERITY OF Macrophomina STEM ROT OF JUTE
黃麻品種,植株成熟度,土壤溫度及土壤濕度對立桔病發生之影響
Autores:  Yung-Hsiung Cheng
Chin-Chyu Tu
程永雄
杜金池
Data:  1972-12
Ano:  1972
Palavras-chave:  [[classification]]14
Resumo:  [[abstract]]Stem rot, caused by Macrophomina phaseoli (Maubl.) Ashhy (Scierotium bataticola Maubl.), is one of the most important diseases of jute (Corchorus capsularis) and kenaf (Hibiscus cannabinus) in Taiwan. the organism is also known to cause root and stem diseases of many economic crops, notably charcoal rot of soybean (Glycine mix), corn (Zea mays), and sorghum (Sorghum Vulgare), and root rot of cotton (Gossypium hirsutum). The epidemics of Macrophomina diseases in relation to environmental factors has been discussed in some crops. Edmunds reported that no infection in soils, occurred when the available soil moisture was above 80%, but the infection, as evidenced by abundant sclerotial production, was so severe as up to 25%. Cotton plants subjected to water stress were more susceptible to the disease than plants watered normally. In sugar pine (Pinus lambertiana), infection occurs early and results in death of a large number of seedlings at 35°C. According to field investigations, the incidence of Macrophomina stem rot of jute is especially severe when the plants are mature and almost ready for harvest. However, the significance of the environment in relation to the severity of the disease on jute is not clear. The purpose of this study was to determine the effects of jute variety, plant maturity, and some environmental factors on the severity of the disease. 本省目前推廣之黃麻4品種中並無完全抗立枯病品種。臺農3號具中等抗病性,其次為臺農選1號,再次為臺農1號,而以臺農2號最為感病。黃麻自發芽後14日內可因。(Macrophomina phaseoli) (Maubl.) Ashhy之侵染產生嚴重幼苗根腐型立枯病,但自30日後黃麻根部對立枯病病原菌之侵染具有抵抗性,即使極感病性品種(臺農2號)亦未見有根腐型病微。黃麻愈成熟愈容易發生莖腐型立枯病,經以牙籤接種法將病原菌接種在不同生育日數之黃麻莖部,15日後檢查罹病病斑結果,以臺農1號為例、生長日數30日者為21.69mm2,60日者為31.38mm2,90日者為32.63 mm2,120日者為 34.69mm2。土壤溫度與黃麻根腐型立枯病之發生成正相關關係。在35℃土溫下黃麻根腐型立枯病發生指數為19.26,31℃為12.3,27℃為9.90,而以23℃最少為7.58。土壤濕度與黃麻莖枯型立枯病之發生成負相關關係。低土壤濕度環境下較容易感染;病斑擴大快速,而在高土壤濕度環境者較有抵抗性二病斑擴大緩慢。黃麻(臺農1號)生長在不同含水量土壤1個月後接種病原菌,經15日後調查病斑大小結果,45% MHC者平均為17mm2,35% MHC者為25mm2,25% MHC者為 26mm2,而以15% MHC者病斑最大為44mm2。
Idioma:  Inglês
Identificador:  [[uri]]http://210.69.150.18:8080//handle/345210000/1443
Relação:  Agricultural Research 21(4): 273-279
農業研究 21(4): 273-279
Formato:  [[extent]]767010 bytes

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