About 2 years ago, the fungus gnat problem occurred in advance, which I however get by yellow stickers still well under control. This time bought expensive herbs and earth was over contaminated. First it began again with a few harmless individual beasts which remained stuck or have been done by me when they were sitting on the yellow flower pot of my gingko. But my herb box lived for two days in view of the Earth completely. The savory was assassinated, the rest of the plant, it went well except for a few Basil sprouts. Since I am not a fan of the chemistry club and I want my herbs like eat later so I'm rummaging encountered on fungus gnats on the nematodes. Ordered (Samenshop24), plants repotted every precaution one day before delivery because (Thank you). Except for the herb box, which is very troublesome in young herb fields. And then clean with the small destroyers. The very next day lying around the first fallen on the battlefield larvae. Now after 2 weeks crawls there any more. The Yellow traps are all yellow and black, and if not an army of fungus gnats again said to colonize my apartment. I know what I need to order. I can only recommend the nematodes. For my complete windowsill (6x 3 liter bucket and the large herb window box) I have the package used half and half. Once deploy for the first and then for the aftertreatment. There was even a little bit for my tomatoes in the kitchen on that offer because of much water demand perfect attack surface. Good luck fighting the pesky black flies and a fly free nerve further gardeners :)