Fungicides

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Fungicides & Fungal Disease Control for Growing Fungal diseases are among the most common and damaging problems in controlled environment agriculture - powdery mildew, botrytis gray mold, Pythium root rot, Fusarium wilt, downy mildew, and damping off all impact indoor and greenhouse crops under the warm, humid conditions that intensive production requires. Fungicide products control fungal pathogens through chemical, biological, or physical mechanisms - used preventively to prevent establishment or curatively to slow progression of active infections. The most effective fungicide programs combine multiple modes of action with cultural practices (humidity management, air circulation, plant spacing) that reduce the environmental conditions that favor disease development. Fungicide Categories Biological fungicides use living organisms or their metabolites to suppress fungal pathogens. Bacillus subtilis and Bacillus amyloliquefaciens products (Cease, Serenade, and similar) produce lipopeptide antibiotics that disrupt fungal cell membranes and inhibit sporulation. Trichoderma species products (RootShield and similar) colonize root surfaces and suppress soilborne pathogens through competition, antibiosis, and induced resistance. These are OMRI-listed, safe for use up to harvest, and compatible with beneficial insect programs. Chemical fungicides (copper-based, sulfur, potassium bicarbonate, and synthetic systemic fungicides) provide faster knockdown of active infections but require attention to pre-harvest intervals, resistance management through mode-of-action rotation, and compatibility with beneficial biology. For preventive disease programs, see our bactericides collection for root disease management alongside foliar fungicide options. Browse the full disease and pest control collection for the complete range. Resistance Management Fungal pathogens develop resistance to repeatedly-applied fungicides rapidly. Rotate between fungicide classes with every 2-3 applicati