I'm posting this in the Tomato Forum b/c that's where my whitefly problem is. I put pine bark mulch around my tomato plants this season and also in two flower beds containing impatiens. I discovered webbing around the impatiens a few weeks ago and sprayed with Pyola and the problem is pretty much under control. Just last week, I've discovered whiteflies and fungus gnats hanging out on the tomatoes. My Bawole Serce (Buffalo Heart) and Krakus tomato plants had some wilted, yellow stems that I had to cut out and I believe it's from the whiteflies causing disease. All the tomato plants are surrounded with the mulch and I can see "webbing" on several areas of the mulch. I take a stick and break it up but the webbing appears again within a day or two.
Is it possible that the mulch was infested? Should I get rid of this stuff ASAP? I like having mulch b/c it cuts down on weeding but I have never had whiteflies and fungus gnats especially on plants inground. I did experience fungus gnats with Earthboxes. I no longer use them. We have not had rain in awhile so it's not super wet out there.
My plants are starting to produce fruit and still look healthy but I can see potential disaster just around the corner. My intuition is saying "get rid of the mulch now"!