What kind of damage do fungus gnats do?
They may not threaten human health, but with fungus gnats you get a triple whammy: Not only do people hate to see them in general, the pests can be vectors for plant diseases – not good! “What’s a vector,” you ask? It’s an organism that transmits a pathogen, so if you have a sick plant, fungus gnats can spread it to all your healthy neighboring plant friends. They can also vector several different fungal root rots, including ones called Fusarium and Pythium, and even foliage pathogens like Botrytis. And as if that’s not bad enough, fungus gnat larvae make breakfast, lunch and dinner out of your plant roots. So there’s good news, and there’s bad news: The good news is adult fungus gnats only live about one week. The bad news is that in this short time, the female will deposit 100-150 eggs on your plant’s soil surface. These eggs are laid in strings of three to 40 and can hatch within four days of being laid! The emerging larvae are clear to creamy-white and can grow to about 5 ½ millime
