Can Fungi Really Eat Plastic?

Fungi digest food outside their bodies. They release enzymes into a material, break large molecules into smaller ones, and absorb compounds they can use. That strategy allows wood-decay fungi to attack complex natural polymers such as cellulose and lignin.

Synthetic plastics are different. Polyethylene and polypropylene have strong carbon-carbon backbones and water-repelling surfaces that resist enzyme attack. Other plastics, including some polyesters and polyurethanes, contain chemical bonds that may be easier for certain enzymes to cut.

Researchers therefore use “degradation” for several stages. A fungus may roughen a surface, change chemical bonds, shorten polymer chains, or release smaller molecules. Complete mineralization is the much higher bar: converting the plastic’s carbon into fungal biomass, carbon dioxide, water, and other simple end products.

Seeing mold on a plastic film is not enough. The fungus might be feeding on dust, manufacturing residues, plasticizers, or another carbon source in the culture medium. A lighter sample can also be misleading if additives washed out or pieces broke away.

Stronger experiments combine several measurements. Respirometry tracks carbon dioxide produced while a microbe grows with a plastic polymer. Infrared and Raman spectroscopy look for changes in chemical bonds. Microscopy reveals pitting and erosion, while molecular-weight analysis can show whether long polymer chains became shorter.

No single test answers every question. Carbon dioxide provides evidence that some carbon was metabolized but can miss organisms that only perform the first depolymerization step. Surface imaging shows damage but cannot, by itself, prove that the polymer was consumed.

A 2024 study screened 146 fungal strains collected from car-repair shops and hypersaline water. The researchers tested five purified polymers without added carbon and then examined promising candidates with microscopy, infrared spectroscopy, and Raman spectroscopy.

Four strain-and-plastic pairings stood out: a Cladosporium strain affected polyamide; Rhodotorula dairenensis affected polypropylene; another Rhodotorula strain affected low-density polyethylene; and Wickerhamomyces anomalus affected polyethylene terephthalate, or PET.

The important lesson was specificity. Individual strains acted on particular polymers under particular conditions, and some plastics showed only modest changes. The authors concluded that a useful process may require a collection of specialized microorganisms rather than one universal “plastic-eating” fungus.

Polyethylene is especially important because it is common and difficult to biodegrade. A 2025 review covering 40 studies published through the end of 2024 identified 26 cultivable fungal genera reported to affect polyethylene. Aspergillus appeared most often, while some of the strongest reported results came from fungi isolated from aquatic environments.

The same review found a recurring pattern: pretreating the plastic and using mixed microbial communities often improved degradation. That matters because sunlight, heat, oxidation, or chemical treatment can make a polymer easier to attack—but also means the fungus may not be doing the whole job by itself.

In a separate 2025 laboratory study, four Fusarium and Penicillium strains isolated from plastic-mulched agricultural soil produced reported weight losses of roughly 2.4 to 5.25 percent in low-density-polyethylene microplastics after 30 days. Microscopy and enzyme measurements supported surface degradation, but the authors still called for tests under variable, competitive, real-world conditions.

• Real waste is a mixture of polymers, dyes, fillers, flame retardants, food residue, and other contaminants.
• Many experiments use small, thin, clean, or pretreated plastic samples under controlled temperature and moisture.
• A percentage of weight loss does not reveal whether carbon became harmless end products, fungal biomass, dissolved fragments, or smaller microplastics.
• A process must be fast, repeatable, safe, and economical at large scale—not merely detectable in a flask.
• Researchers must identify degradation products and confirm that the treatment does not create a new toxicity problem.

This is why the strongest recent papers describe fungal plastic degradation as early-stage biotechnology. The field has candidates and better screening tools, but not a general-purpose fungal recycling plant ready to handle municipal waste.

Usually not. Many of the organisms in this research are molds or yeasts, and “fungus” is a much broader category than the familiar fruiting mushrooms people grow or forage. Even when a mushroom-forming species is studied, the active organism is typically its mycelium and enzymes rather than a mushroom cap.

This work is also not a home experiment. Some studied fungi can spoil food, damage crops, trigger allergies, or cause opportunistic infections. Plastic additives and breakdown products can be hazardous. Cultures and treated material belong in properly controlled laboratories.

The most realistic near-term path may be to identify useful enzymes, improve them, and place them in a controlled treatment process. Another possibility is a staged microbial community in which one organism opens the polymer and others consume the resulting fragments.

Fungi might also help with selected waste streams rather than mixed trash—for example, one known polymer from an industrial process. A narrow, contained application makes it easier to control conditions, collect products, and prove where the plastic carbon went.

Future studies need standardized methods, untreated commercial plastics, full carbon accounting, product-toxicity tests, long-term trials, and pilot-scale cost and energy measurements. Those results will tell us whether fungal degradation complements recycling or remains mainly a source of interesting enzymes.

Yes: certain fungi can partially degrade particular plastics under controlled conditions, and researchers now have stronger ways to measure that activity.

No: fungi do not currently offer a simple way to make ordinary plastic waste disappear. The evidence is polymer-specific, the processes are usually slow, and complete mineralization and safe end products are not always demonstrated.

The responsible takeaway is neither miracle nor myth. Fungal chemistry may contribute useful tools to a larger recycling system, but reducing unnecessary plastic and using established recovery methods remain the practical options today.

This overview emphasizes recent peer-reviewed research and methodological limitations. It does not treat visible fungal growth or sample weight loss alone as proof of complete biodegradation.

• Heliyon (2024): A screening method for plastic-degrading fungi
• Science of the Total Environment (2024): Tapping into fungal potential
• Biodegradation (2025): Polyethylene biodegradation by cultivable fungi
• Journal of Environmental Management (2025): LDPE microplastics degraded by soil fungi