Hello Judy. I have house plants on my desk at work (as do some of my co-workers) and someone’s plants are having issues with gnats. I don’t think any of the plants are sitting in water (over watered). What might be the cause and what can we do about it without using an insecticide in our office to get rid of these pests?
The gnats usually come from sitting water, damp soil, or fruits that employees might bring from home. Placing small squares of Yellow Sticky Insect Cards in the plants is the best way to get rid of gnats. You can read about Yellow Sticky Insect Cards in the Glossary of the website. Change the cards as they fill up with the insects. Keep using the cards until there are no insects bothering you.