Little Flies and Gnats

I remember getting a call for small gnat like flies in an office and the customer wanting relief from them. It was a seventh floor office and there were offices above. So they weren't coming from a leak above and they were not coming from a broken soil pipe since the bathroom was down the hall. As I took a closer look at he fly and noticed the window sill full of plants, I soon put two and two together and decided that they could be fungus gnats. The soil was very wet and I told the customer to stop watering the plants for a while and in the mean time I placed a glue monitor I had in on of the pots to see what I would find. I said I'd be back in a few days to see how things are. I returned with some yellow glue traps as recommended for adult fungus gnats and a potato, I read that the larvae will migrate to the potato and start to feed on it, leave it for a few days and remove it, and remove a bunch of larvae. With the proper water management and some trapping techniques...the problem was resolved.