Table 1: Action mode and possible nontarget effects of fungicides.

Action mode Fungicide chemical group Common name Nontarget effects Lipid, sterol, and other membrane components Lipid Aromatic hydrocarbons Dicloran Mutagen to Salmonella typhimurium [12] Etridiazole Retards nitrification by affecting ammonium oxidizers [13] Sterol     Triazoles Triadimefon Long-term inhibiting effects on soil bacterial community [7] Triticonazole Increases total number of bacteria in soil [15] Cinnamic acid amide Dimethomorph Impacts nitrifying and ammonifying bacterial activities in sandy soils [17] Triazole Hexaconazole Impacts bacterial activities related to N cycling [19] Morpholine Fenpropimorph Inhibit general bacterial activity in wetland [16] Triazole Propiconazole Tebuconazole May retard plant-growth-promoting effects of Azospirillum brasilense on its hostplant [20] Intracellular membrane components Hydrochloride Acriflavine Thickens peripheral and cross cell wall of Staphylococcus aureus [18] Amino acid and protein synthesis        Glucopyranosyl antibiotic Streptomycin Inhibits amino acid synthesis in bacteria [3] and is neurotoxic to amphibian [4] Tetracycline antibiotic Oxytetracycline Also used as bactericide [21] Signal transduction       Phenylpyrroles Fludioxonil Toxic to algae [22] and potential risk to prokaryotes [23] Dicarboximides Iprodione Affects signal transduction in bacteria [24] Vinclozolin Inhibits total bacterial growth [25] Respiration NADH oxido-reductase (Complex I) inhibitors Pyrimidinamines Diflumetorim Unknown Succinate-dehydrogenase (Complex II) inhibitors Pyridine carboxamides Boscalid May affect growth of prokaryotes [26] Benzamides Flutolanil Gxathiin carboxamides Carboxin Inhibits denitrifying bacterial activity in wetland sediment [16] Oxidative phosphorylation uncouplers 2,6-dinitroanilines Fluazinam Have a potential risk to environmental microorganisms [27] Dinitrophenyl crotonate Dinocap Inhibits ammonifying bacterial activity and stimulate general bacterial respiration in soil [28] Mitosis and cell division Inhibitor of spindle microtubules assembly Methyl benzimidazole carbamate Benomyl May affect nitrifying bacteria [29] and arbuscular mycorrhizal fungi [30] Carbendazim Reduces the diversity of soil bacteria [31] Phenylurea Pencycuron May affect metabolically activated soil bacteria in short term [32] Nucleic acids synthesis RNA polymerase I inhibitors Acylalanines Metalaxyl Affects activities of ammonifying and nitrifying bacteria in soil [33] Oxazolidinones Oxadixyl Unknown Adenosin-deaminase inhibitors Hydroxypyrimidines Ethirimol Unknown Phthalonitrile Chlorothalonil Impacts bacterial activities related to N cycling [29] Multisite activity Dithiocarbamate Mancozeb Impacts bacterial activities related to nitrogen cycling [17] and carbon cycling [28] in soils Phthalimide Captan Inhibits denitrifying bacterial activity [16] Dithiocarbamate Thiram Anthraquinone Dithianon Reduces bacterial diversity in soil [34] Copper Copper sulfate Reduces the number of bacteria and streptomycetes in sandy soil [35]