摘要
厚朴苗根腐病菌(Fusarium oxysporum Schlecht)生长发育的温度范围为12—36℃,最适25—29℃。该菌适应的pH值范围较广,在pH 3—12之间均能生长,但以pH6.5最佳。病菌要求较高的湿度,相对湿度90％以上,有利于分生孢子萌发。它能有效地利用多种碳源,但以蔗糖和葡萄糖为最佳;也能利用多种氮源,其中以蛋白胨、尿素为好。 试验证明,本病是典型的土传病害,病残体也是侵染来源之一。湿度是年份流行的主导因素。土质、连茬、林间管理等对病害发生与否也起很大作用。选择土层深厚的砂壤土为苗圃地,加强抚育管理,适时灌药是防病的根本措施。
The studies revealed that the temperatures for the growth and development of Fu-sarium oxysporum were between 12-36℃, and the optimum was 25-29℃. the substrat has a relatively broader range of pH values from pH 3 to 12, with an optimum PH 6.5 for the mycelial growth and sporulation. The relative humidity for conidia germination ranged from 90 to 100%.The fungus grew and sporulated better in sucrose and glucose as the carbon sources,and in urea as the nitrogen sources tested.
The root rot of Magnolia biloba has been widely transmited by infected soils The infected plant residue was the most important carrier. The prevalence of this disease was closely related with the climatic factors, soil.croppieng systems and cultural-measures.
That the selection of plantation land, improved cultural measures and timely applying of 50% Bavistin at a dilution of 1 : 500 had a best effect in the control of the seedling root rot of Magnolia biloba.
出处
《福建林学院学报》
CSCD
1990年第1期57-62,共6页
Journal of Fujian College of Forestry
