Question
Thank you very much for the info. I bought SCHULTZ Houseplant and Garden Insect Spray. If I use it, dou you think that It will be enough to get rid of gnats.
I am feeling like I have to use something to save the plant as soon as possible  because leaves of diffenbachia are turning yellow very quickly. I am feeling like it is dying.
What do you suggest to do?
Thanks DERYA

Answer
Derya,

You can try the spray to kill the gnats but the plant is dying because the soil is too wet and the roots are rotting off.  If you feel you have to do something then remove some of the wet soil and replace it with dry soil. Immediately drain off all the water in the drain tray. Set the plant in the sink overnight without the drain tray under it. Good luck.

Darlene