A method of increasing pathogen resistance in a plant or a part of a plant, the method comprising: contacting the plant or the part of the plant with a first double-stranded RNA, small RNAs, or small RNA duplexes that target a first fungal pathogen dicer-like gene or promoter, and contacting the plants or part of the plant with a second double-stranded RNA, small RNAs, or small RNA duplexes that target a second fungal pathogen DCL gene or promoter, wherein (a) the first double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:1, SEQ ID NO:3, SEQ ID N0:9, SEQ ID NO:10, SEQ ID NO:28, or SEQ ID NO:29, or a fragment thereof comprising at least 50 contiguous nucleotides, or (b) the first double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:5, SEQ ID NO:7, SEQ ID NO:11, SEQ ID NO:12, SEQ ID NO:30, or SEQ ID NO:31 or a fragment thereof comprising at least 50 contiguous nucleotides, wherein the plant is a species of the genera Asparagus, Atropa, Avena, Brassica, Citrus, Citrullus, Capsicum, Cucumis, Cucurbita, Daucus, Fragaria, Glycine, Gossypium, Helianthus, Heterocallis, Hordeum, Hyoscyamus, Lactuca, Linum, Lolium, Lycopersicon, Malus, Manihot, Majorana, Medicago, Nicotiana, Oryza, Panieum, Pannesetum, Persea, Pisum, Pyrus, Prunus, Raphanus, Rosa, Secale, Senecio, Sinapis, Solanum, Sorghum, Trigonella, Triticum, Vitis, Vigna, or Zea, and wherein the plant or the part of the plant has increased resistance to the fungal pathogen compared to a control plant or control plant part that has not been contacted with the double-stranded RNA, small RNAs, or small RNA duplexes. contacting the plant or the part of the plant with a first double-stranded RNA, small RNAs, or small RNA duplexes that target a first fungal pathogen dicer-like gene or promoter, and contacting the plants or part of the plant with a second double-stranded RNA, small RNAs, or small RNA duplexes that target a second fungal pathogen DCL gene or promoter, wherein (a) the first double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:1, SEQ ID NO:3, SEQ ID N0:9, SEQ ID NO:10, SEQ ID NO:28, or SEQ ID NO:29, or a fragment thereof comprising at least 50 contiguous nucleotides, or (b) the first double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:5, SEQ ID NO:7, SEQ ID NO:11, SEQ ID NO:12, SEQ ID NO:30, or SEQ ID NO:31 or a fragment thereof comprising at least 50 contiguous nucleotides, (a) the first double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Botrytis DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:1, SEQ ID NO:3, SEQ ID N0:9, SEQ ID NO:10, SEQ ID NO:28, or SEQ ID NO:29, or a fragment thereof comprising at least 50 contiguous nucleotides, or (b) the first double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL1 and the second double-stranded RNA, small RNAs, or small RNA duplexes target Verticillium DCL2; wherein the first and second DCL gene or promoter comprise a sequence of SEQ ID NO:5, SEQ ID NO:7, SEQ ID NO:11, SEQ ID NO:12, SEQ ID NO:30, or SEQ ID NO:31 or a fragment thereof comprising at least 50 contiguous nucleotides, wherein the plant is a species of the genera Asparagus, Atropa, Avena, Brassica, Citrus, Citrullus, Capsicum, Cucumis, Cucurbita, Daucus, Fragaria, Glycine, Gossypium, Helianthus, Heterocallis, Hordeum, Hyoscyamus, Lactuca, Linum, Lolium, Lycopersicon, Malus, Manihot, Majorana, Medicago, Nicotiana, Oryza, Panieum, Pannesetum, Persea, Pisum, Pyrus, Prunus, Raphanus, Rosa, Secale, Senecio, Sinapis, Solanum, Sorghum, Trigonella, Triticum, Vitis, Vigna, or Zea, and wherein the plant or the part of the plant has increased resistance to the fungal pathogen compared to a control plant or control plant part that has not been contacted with the double-stranded RNA, small RNAs, or small RNA duplexes.