Scytalone ((+)-Scytalone) is a naphthalenone pentaketide which can be extracted from some tracheiphilous fungi. Scytalone is a natural precursor to Melanin. Scytalone is possibly related to grape esca disease [1].
References:
[1]. Bruno G, et al. Effects of three esca-associated fungi on Vitis vinifera L.: IV. Diffusion through the xylem of metabolites produced by two tracheiphilous fungi in the woody tissue of grapevine leads to esca-like symptoms on leaves and berries[J]. Physiological and Molecular Plant Pathology, 2007, 71(1-3): 106-124.
References:
[1]. Bruno G, et al. Effects of three esca-associated fungi on Vitis vinifera L.: IV. Diffusion through the xylem of metabolites produced by two tracheiphilous fungi in the woody tissue of grapevine leads to esca-like symptoms on leaves and berries[J]. Physiological and Molecular Plant Pathology, 2007, 71(1-3): 106-124.