
Mushrooms are a versatile ingredient used in a variety of dishes, but they can sometimes be infested with bugs. While button mushrooms are generally not infested, other varieties like Portobello and shiitake mushrooms may harbour small flies, worms, and other insects. To ensure your mushrooms are bug-free, it's important to inspect and clean them properly. This involves checking the stem, cap, and fan-like underparts for any signs of infestation before thoroughly washing them. In this paragraph, we will explore the steps to ensure your mushrooms are safe to consume and free from unwanted pests.
| Characteristics | Values |
|---|---|
| Types of Mushrooms | Button, Portobello, Shiitake |
| Infestation | Flies, worms |
| Seasonality | Summer months (June-September) |
| Inspection Method | Separate parts, run fingers through, observe, wash |
| Action if Infested | Discard |
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What You'll Learn
- Button mushrooms are usually bug-free and can be used after washing
- During summer, shiitake mushrooms can have small flies hiding in the white fan
- To clean, run fingers through the fan and discard if flies are present
- Portobello mushrooms can have flies and worms in the underpart or inner section
- Remove the stem, scrape out the underpart, and wash the cap and stem thoroughly

Button mushrooms are usually bug-free and can be used after washing
It is important to check mushrooms for bugs before consuming them. While button mushrooms are usually bug-free, it is still a good idea to give them a thorough wash before use. This is because, while rare, it is possible for them to be infested with insects.
Button mushrooms have a low risk of bug infestation under normal circumstances. However, it is always a good idea to be cautious and inspect any mushrooms you plan to consume. If you find any bugs, it is best to discard the mushrooms.
To inspect button mushrooms, start by visually examining them for any signs of bugs or insects. Look for any small flies, worms, or other insects that may be present. If you see any bugs or insect eggs on the mushrooms, do not consume them.
After a thorough inspection, if no bugs are found, you can proceed to wash the mushrooms. Wash the mushrooms under running water, gently rubbing them with your fingers or a soft vegetable brush to remove any dirt or residue. Make sure to wash them thoroughly to reduce the risk of any potential insect contamination.
Finally, after washing, give the mushrooms a final inspection before using them. Cut or slice the mushrooms as needed for your recipe. By following these steps, you can ensure that your button mushrooms are bug-free and safe to consume. Remember to practice good food hygiene and always wash your mushrooms, even if they appear bug-free.
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During summer, shiitake mushrooms can have small flies hiding in the white fan
During the summer months, shiitake mushrooms can be infested with small flies hiding in the white fan-like gills of the mushroom. This is more likely to occur during the warmer months of June to September. The flies are typically mushroom phorid flies, which are very small, usually between 1/64 and 1/8 inch long. They have a steep arch or hump behind their heads and their eyes are dark. They also have a distinct anise-like odour.
To check for these small flies, firmly run your fingers through the white fan-like gills of the shiitake mushroom and observe if any flies come out. If flies are noticed, discard that mushroom. This process is quick and recommended, even though shiitake mushrooms are not infested under normal circumstances.
It is worth noting that button mushrooms are typically not infested and may be used after a thorough washing. Portobello mushrooms, on the other hand, may be infested with flies, worms, or other bugs, and require more thorough checking and cleaning. To clean them, separate the stem from the cap, then scrape out the entire brown fan-like underpart, which can be done easily with a spoon. Wash the cap and stem thoroughly with water.
If you are foraging for mushrooms, it is important to inspect your mushrooms closely as they can be infested with various insects and larvae. Common bugs found on wild mushrooms include springtails, fungus gnat larvae, slugs, and snails. Springtails are very small (0.5-3mm) and can be found in large swarms on the exterior of mushrooms. They are harmless and edible, and get their name from their ability to jump up to 10cm. Fungus gnats leave their mark on mushrooms by taking large chunks out of the cap or stem. Slug and snail mucus is generally harmless, but wild mushrooms should always be cooked before eating.
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To clean, run fingers through the fan and discard if flies are present
To check mushrooms for bugs, you must first identify the type of mushroom. Button mushrooms, for example, are generally not infested and can be used after a thorough washing. Portobello mushrooms, on the other hand, may have flies embedded in the underpart or inner section. To clean Portobello mushrooms, follow these steps:
- Separate the stem from the cap.
- Check the stem for any signs of infestation.
- Examine the cap by scooping out the fan-like underpart. During summer, shiitake mushrooms can harbour small flies in this area. Run your fingers through the fan and discard the mushroom if flies are present.
- Wash the mushroom thoroughly.
It is important to note that this process is specific to Portobello mushrooms. Other types of mushrooms may require different cleaning methods. Always inspect mushrooms carefully and wash them thoroughly before consumption to ensure they are free of bugs.
In summary, when cleaning Portobello mushrooms, it is crucial to inspect the fan-like underpart for the presence of flies, especially during the summer months. If flies are detected, discard the mushroom and do not consume it. This step helps ensure that the mushrooms are safe and bug-free.
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Portobello mushrooms can have flies and worms in the underpart or inner section
Portobello mushrooms can sometimes contain flies and worms in the underpart or inner section. To check for bugs, start by removing the stem. If the mushroom has a noticeable stem, this can be easily twisted off. If the mushroom is stemless, you can skip this step.
Next, examine the detached cap. The fan-like underpart of the mushroom can contain small white or red worm mites, flies, and maggots. To check for these, scrape out the entire brown fan-like underpart with a spoon. If it is summer, you should also check for small flies. Firmly run your fingers through the fan and observe if any flies come out. If flies are noticed, discard the mushroom.
Finally, wash the mushroom thoroughly with water. No inspection is necessary, but a thorough wash will ensure that any remaining bugs are removed. This process is the same for pre-sliced Portobello mushrooms, which are less likely to contain bugs.
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Remove the stem, scrape out the underpart, and wash the cap and stem thoroughly
When preparing mushrooms, it is important to check them for bugs and clean them thoroughly before cooking and consuming them. Here is a detailed guide on how to do this:
Remove the stem:
Using your hands or a small knife, gently twist and pull the stem away from the cap of the mushroom. This step is crucial as bugs and insects can hide in the small space between the stem and the cap. By removing the stem, you can expose any hidden pests and make it easier to inspect the rest of the mushroom.
Scrape out the underpart:
The underpart of a mushroom is the fan-like structure located on the underside of the cap. This area is particularly susceptible to bug infestations, especially in the case of Portobello and shiitake mushrooms. Use a spoon or your fingers to gently scrape away the entire underpart, ensuring that you remove all the brown or white fan-like material. This step helps dislodge any small flies, worms, or other insects that may be embedded in this section.
Wash the cap and stem thoroughly:
Once you have removed the stem and scraped the underpart, it is important to wash the mushroom thoroughly. Rinse the cap and stem under running water, gently rubbing and agitating them with your fingers to dislodge any remaining dirt, debris, or hidden bugs. Ensure that you wash both the inside and outside surfaces of the cap and stem to eliminate any traces of pests or impurities.
It is worth noting that button mushrooms are typically not infested and can be used after a thorough washing. However, during the summer months, shiitake mushrooms may harbour small flies in their white fan-like underparts, so extra care should be taken during this period. Always inspect your mushrooms closely and, if you notice any signs of bug infestation, discard those mushrooms to ensure food safety and hygiene.
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Frequently asked questions
Button mushrooms are not usually infested. They can be used after a thorough washing.
Portobello mushrooms can be infested with flies and worms. To check, separate the stem from the cap and check both parts. Then, scoop out the brown fan-like underpart with a spoon and wash thoroughly.
During the summer, shiitake mushrooms can be infested with small flies. Firmly run your fingers through the white fan and observe if any flies come out. If flies are noticed, discard the mushroom. During the winter, you do not need to check for flies.

























