Determining six sets (S1–S6) of loop-mediated isothermal amplification (LAMP) primers. Label 1, 3, 5, 7, 9, 11: the template DNA was extracted from the carbendazim sensitive strain (S). Label 2, 4, 6, 8, 10, 12: the template DNA was extracted from the isolates of Botrytis cinerea with the E198A mutation (E198A). (a) LAMP primers sets. (b) HNB-based visual changes in colors. The positive samples were pointed out by red arrows.