Mushroom foragers warned of heavy metal accumulation and larvae risks

As the mushroom foraging season approaches, experts are issuing warnings regarding the safety of wild mushrooms. A study indicates that larger, older mushrooms may pose health risks due to the accumulation of heavy metals, such as cadmium, arsenic, chromium, mercury, and lead. While size is often a sought-after trait for foragers, older specimens are more likely to have absorbed these substances and are frequently damaged by insects or mold.

Additionally, warm summer temperatures can increase the presence of larvae, such as those from flies or click beetles, within edible mushrooms. Experts advise that simply removing larvae is insufficient, as the tunnels left behind may contain excrement and other contaminants. Consuming such mushrooms can lead to poisoning, abdominal pain, or vomiting. Foragers are encouraged to inspect mushrooms thoroughly by cutting them open and are advised to avoid specimens that are overly waterlogged, moldy, or heavily damaged. The Czech Mycological Society also notes that most edible mushrooms are weakly poisonous, posing a higher risk to small children.