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Effects of exogenous addition of pectinesterase (PE) at various concentrations on the colony size of Phytophthora infestans strains HZ02 (A), DL04 (B), HJG02 (C), and ML01-2018 (D), mycelial weight of the four strains (E), sporangial production of the four strains (F), and spore germination of DL04 (G). Different letters on the bars indicate significant differences between treatments (p < 0.05).
