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“Phyllosphere” is an ancient Greek word. “Phyllo” means leaf, and “sphere” refers to the field of influence. The term “Phyllosphere” referred to the above-ground part of a plant and was coined by Last and Ruinen in the 1950s in “Analogy to the Rhizosphere” [81,82]. The phyllosphere is associated with the largest biosphere–atmosphere interphase on Earth and is dominated by aerial plant parts, such as leaves, flowers, fruits, and others. The phyllosphere microbiota interacts with host and other microbes to colonize outer plant surfaces in addition to biotic, abiotic, and anthropogenic factors. Most biomes reach the phyllosphere via soil, wind, water, or insect transmission [83]. Leaf microbiotas first interacts with the outer cuticular layer, and the leaf micro-environment determines microbial communities [84]. Stomatal opening and wounds on the leaves surface are the primary paths for microbiota entering the inner phyllosphere [85]. Leaf exudates, such as terpenes, benzenoids, methanol, sugar, amino acids, and organic acids, also shape phyllosphere microbial assembly [86].