Ask-a-Dave's-Gardener: Help with houseplants , 0 by Jwil84

Jwil84 wrote:
I have several house plant that have been showing some leaf damage. Overall the plants appear healthy but the problem seems to be spreading to other plants and leaves. House humidity is kept around 50%, I used filtered well water, and miracle grow potting mix with additional perlite added for drainage. I\'ve used this mix for years without any issues. I have seen some fungus knats around and am working on that issue, but haven\'t been able to find any other pests. Below are some pics of the a few of the leaves. A croton, calathea, dieffenbachia, aglaonema, and pothos. I\'ve had quite a few houseplants for years, but have never had any problems like this. My concern is that it does seem to be spreading. I did purchase a few new plants from some nurseries online as well as big box store and wonder if I brought in a pest.