This a pic of an heirloom tomato plant that I brought into the house about 3 weeks ago because it was getting too cold at night and I had only gotten two tomatoes from it. I just threw it out today and when I dumped out the soil there was larvae in the soil. I believe it is fungus gnats as they are flying all over my house. I treated my plants (not edible plants) with a systemic insecticide and yet these bugs persist. Help!!! Please.

