Antifungal Activity of Pseudomonas choloeaphtis HL5-4 Against Tomato Gray Mold and Its Colonization Ability Antifungal Activity of Pseudomonas choloeaphtis HL5-4 Against Tomato Gray Mold and Its Colonization Ability Analyses for the colonization ability of Bacillus subtilis XF-1 in the rhizosphere