The present invention provides a method for determining whether or not a sample contains at least one of Cercospora fungus and Pseudocercospora fungus. In the method, first, the sample is added an aqueous solution containing N,N,N',N'-Tetramethyl-1,4-phenylenediamine and 5-(2,4-disulfophenyl)-3-(2-methoxy-4-nitrophenyl)-2-(4-nitrophenyl)-2H-tetrazolium to provide a mixture. The aqueous solution has a pH of not less than 5.1 and not more than 6.5. Then, the mixture is irradiated with light having a wavelength of 400 to 500 nanometers to measure a first absorbance Ay of the mixture, and the mixture is irradiated with light having a wavelength of 500 to 800 nanometers to measure a second absorbance Ax of the mixture. If the value of Ay / Ax is not less than 1.5 or the mixture is orangey, it is determined that the sample contains at least one of Cercospora fungus and Pseudocercospora fungus.
本发明提供了一种用于确定样品中是否含有至少一种子囊真菌和假子囊真菌的方法。在该方法中,首先向样品中加入含有 N,N,N',N'-四甲基-1,4-
苯二胺和 5-(2,4-二
磺酸苯基)-3-(2-甲氧基-4-
硝基苯基)-2-(4-
硝基苯基)-2H-
四氮唑的
水溶液,以提供混合物。
水溶液的 pH 值不低于 5.1,不高于 6.5。然后,用波长为 400 至 500 纳米的光照射混合物,测量混合物的第一吸光度 Ay,再用波长为 500 至 800 纳米的光照射混合物,测量混合物的第二吸光度 Ax。如果 Ay / Ax 的值不小于 1.5 或混合物呈橙色,则可判定样品中含有至少一种真菌,即 Cercospora 真菌和 Pseudocercospora 真菌。