Lexicon Intrinsic Fungicide 21 oz. Bottle (Agency). Lexicon Intrinsic brand fungicide is the most effective, broadest spectrum turf fungicide and provides the ultimate protection and plant health for your turf. Lexicon Intrinsic brand fungicide is a new chemistry combination for control of the toughest turfgrass diseases, including brown patch, dollar spot, fairy ring, pythium root dysfunction , snow mold, and summer patch, in addition to 22 other diseases. It also increases photosynthesis, strengthens roots and improves resilience to stress. Combining the enhanced systemic properties of Xemium fungicide with the proven success of Insignia Intrinsic brand fungicide, Lexicon Intrinsic brand fungicide provides turfgrass professionals with a superior cornerstone product for fungicide programs. Intrinsic is a brand of products from BASF that provide disease control and plant health benefits.