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Mulch Fungi

Host: Joanna Coles, Warren County Extension Agent for Agriculture and Natural Resources Guest: Dr. Nicole Gauthier, UK Extension Plant Pathologist Topic: Mulch Fungi “Organic mulches, such as shredded cypress and pine bark, are commonly used in commercial and home landscapes. Mulches provide numerous benefits, including conservation of soil moisture and suppression of weeds, as well as offer a visually pleasing background for landscape plantings. However, mulch is also a substrate for a diverse group of saprophytic organisms (saprobes), such as mushrooms and slime molds. While often causing alarm to gardeners unfamiliar with them, saprobes do not infect plants or cause plant diseases. The following overview is intended to dispel concerns while focusing on the beauty and benefits of mulch saprobes. Saprobes are microorganisms, such as fungi and slime molds, which decompose plant materials (including wood mulch and leaves). These scavengers get their nutrients from nonliving organic materials. They are not pathogenic, so they do not cause plant disease. A variety of saprobes are needed to completely recycle nutrients from organic matter, so it is advantageous to have diverse variety of beneficial fungi present and growing in garden beds. Mulch fungi break down organic matter, such as plant debris and wood mulch. This process releases nutrients back into the soil, thus improving soil fertility. Mulch fungi can include species that are mostly invisible or mushroom-producers that send up fruiting structures. Slime molds are not fungi, but they have life cycles similar to saprophytic fungi. They obtain nutrients from already-decomposed matter. The presence of slime molds is typically a sign of high organic matter and healthy soils.” Follow this caption source link to the publication for more information: https://plantpathology.ca.uky.edu/fil...