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29 votes
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Why did my sweet corn kernels grow into this?

That's corn smut, a fungus. It's edible and a part of Mexican cuisine. I doubt that you need to notify the authorities, but given that USDA has been trying for decades to eradicate it in the US, it's ...
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16 votes
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What are these brown, cap-shaped mushrooms on my birch tree?

Those look like Birch Polypore, scientific name Piptoporus betulinus. This mushroom is global but found almost exclusively on birch trees. The polypore is called "saprobic," which means it feeds on ...
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16 votes
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Is this heavy blue-green growth on my tree trunk and branches a form of lichen?

These look like the tree lichens that are growing on my own trees. A lichen is a composite organism where by a fungus lives together with an algae in a symbiotic relationship. They don't hurt the tree,...
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15 votes
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What is this (fungus?) on my fruit trees, and should I treat it?

That is lichen, which is not detrimental to your tree's health (it's not a parasite, it lives off of photosynthesis). This is normal, no need to worry.
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9 votes

Is this heavy blue-green growth on my tree trunk and branches a form of lichen?

As Graham says they are lichen and moss. A tree will commonly live in a symbiotic relationship with millions of macro and micro-scopic organisms. In tropical and temperate rain forests overgrowth on ...
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8 votes
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What is this yellow mold or fungus in my container?

It is a fungus digesting the organic matter in the soil underneath the plant, and it is, if anything, beneficial. See the bark chips in the soil? They are what the fungus is breaking down. The white ...
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8 votes

How can I get rid of fungus on my pepper plants?

There appears to be a long standing insect infestation, possiby whitefly (does anything rise up and fly about when you go near or disturb the plant?) or scale infestation of some sort. The leaves ...
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7 votes
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What fungus is this?

This is a member of the Nidulariaceae / birds nest fungi, the exact variety would need better photos and possibly a microscope, but I can still answer your other questions: No, they are not dangerous....
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7 votes
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What is this 'bleeding' mushroom?

I don't know which fungus it is, but there are bracket fungii which exude amber coloured droplets (Shaggy Bracket, Oak Bracket fungus) although this one doesn't look like either of those. Trees, when ...
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7 votes
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How can I get rid of fungus on my pepper plants?

Your close up leaf images show an aphid infestation. In my experience, this is a highly persistent insect that infests chili plants amongst others with over 500 different types of Aphids specific to ...
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7 votes
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Identify brown fungus growing on dead branches of an Escarpment Live Oak

It is a little hard to tell for sure from the single photo (if you could pick a specimen & post more detailed photos including the underside & provide a description of the texture, it would ...
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7 votes
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What are these small white balls that appeared on the soil in my greenhouse?

How impressive! I think you can relax - this is not a sign of a massive insect infestation and not a fungus, but one of nature’s wonders known as slime mold. The “eggs” are the spore-carrying ...
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6 votes
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Should I remove brown, cap-shaped Birch Polypore mushrooms from my tree?

Removing the fruiting bodies will not slow the damage/decay to the host tree. They do not affect the rate of the mycelium growth within the tree, and, if anything, removing the fruiting bodies will ...
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  • 51.5k
6 votes

How to completely rid my potting soil/container of fungi which seems to continually attack my plants

I would also suggest that you only water the plants in the morning when the excess water will evaporate in the sunlight. I made this mistake several times with midnight watering which caused my salvia,...
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6 votes
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How do I get rid of worm-like trails all over my Senetti plants' leaves?

That is leafminer damage. You can control leafminers by cutting off affected leaves, to improve appearance, and remove existing leafminers before they mature (for minor infestations) Spraying with ...
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6 votes

Is this powdery mildew on my tomato?

That appears to be Southern Blight, Sclerotium rolfsii It's a fungal disease from the soil, and affects many species of plants. You cannot cure plants infected with it. From the University of ...
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6 votes

Is powdery mildew spreading through my garden?

Looks like some kind of Verbena in the top pic, possibly Verbena bonariensis - these are prone to getting powdery mildew, particularly towards the end of the growing season, and the usual cause is ...
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  • 128k
6 votes

Are these mushrooms poisonous and how can I get rid of them?

It's a member of the order Agaricales. Which contains many edible mushrooms such as the white mushrooms you buy in the store as well as very poisonous mushrooms such as the European destroying angel. ...
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  • 509
6 votes

Why is this years-old vine dying and showing strange beige spots?

The plant is Rhoicissus rhomboidea 'Ellen Danica', common name Mermaid Vine, though its often referred to as grape ivy. At first glance, rust infection springs to mind, but a closer examination ...
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6 votes
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How to get rid of this white fungus

These are Parasola plicatilis, the pleated inkcap. They are saprobic, meaning they live off decaying matter in the soil, and these fruiting bodies are usually short lived. Common in grass, but ...
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  • 128k
6 votes

What are these fungus-like things in my tree?

It is lichen, yes - if it's only excessive on dead branches, that's why it's proliferating, because the wood is dead, although it does occur on live branches or trunks of trees as well, though not ...
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  • 128k
5 votes
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Identification of fungus like fuzz on apple tree

Depends - is there anything resembling this on other parts of the tree, perhaps on the leafed branches? This could be woolly aphid, it could be scale eggs (some scale insects lay their eggs under ...
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  • 128k
5 votes

What are all the methods to control powdery mildew?

That time of year and inevitable. For summer squash, you can cut the worst affected leaves off, leaving the stem. We make sure all the cucumbers grow up on frames so they're well off the ground and ...
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  • 3,873
5 votes

What is this yellow mold or fungus in my container?

Looks like Fuligo septica, one of the slime moulds, also known charmingly as dog vomit slime mould. Harmless, but not attractive, and very common where there are bark chips within the compost mix or ...
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  • 128k
5 votes
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How can I control mint rust?

I bought some Neem Oil to control spider mites, a task for which it has been largely ineffective. However, on trying it on the mint, the mint rust went away almost immediately ... within 4 days the ...
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  • 717
5 votes

What is this fungus that looks like a brain coral?

I've got to say that looks an awful lot like a brain coral with moss growing on it. I know of no mushrooms that look nearly as similar to brain coral, and I don't think any fungal fruiting body would ...
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  • 6,937
5 votes

How many times do Fungus Gnats lay eggs?

Fungus gnats have a busy but short life. As this site indicates An adult fungus gnat lays up to 200 eggs during the one week it spends as an adult winged gnat. The adult then dies. Legless larvae ...
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