{"title":"Effects of Host Variety, Plant Maturity, Soil Temperature, and Soil Moisture on the Severity of Macrophomina Stem Rot of Jute","authors":"Yung-Hsiung Cheng, C. Tu","doi":"10.29951/JARC.197212.0008","DOIUrl":null,"url":null,"abstract":"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,其次爲臺農選1號,再次爲臺農1號,而以臺農2號最爲感病。黃麻自發芽後14日內可因(Macrophomina phaseoli (Maubl)Ashby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)亦未見有根腐型病徵。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號爲例、生長日數30日者爲21.69平方公厘,60日者爲31.38平方公厘,90日者爲32.63平方公厘,120日者爲34.69平方公厘。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爲19.26,31℃爲12.3,27℃爲9.90,而以23℃最少爲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;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者平均爲17平方公厘,35%MHC者爲25平方公厘,25%MHC者爲26平方公厘,而以15%MHC者病斑最大爲44平方公厘。","PeriodicalId":159002,"journal":{"name":"Taiwan Agricultural Research","volume":"3 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1972-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Taiwan Agricultural Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.29951/JARC.197212.0008","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}