Pests and Diseases forum: flies or bugs in my soil?

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Name: Carol Texas
Central Texas (Zone 8b)
"Not all who wander are lost."
Region: Texas Composter Greenhouse Cactus and Succulents Organic Gardener Hummingbirder
Herbs Garden Art Dragonflies Garden Ideas: Level 2
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Ecscuba
Jan 21, 2015 6:36 PM CST
Almost all the plants in my GH have these -- very tiny - almost look like small flies - they fly around the pots a little, but mostly I see them crawling around in the pots. What are they? And do I need to treat them?
[url=Www.carolmedfordart.com]Www.carolmedfordart.com[/url]
My passion is painting but gardening is running a close second.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Jan 23, 2015 9:21 AM CST
From the limited description and behaviour it sounds like it could be fungus gnats. You might find this PDF of an article by an expert in fungus gnats useful:

http://www.ksre.ksu.edu/bookstore/pubs/MF2937.pdf
Name: Carol Texas
Central Texas (Zone 8b)
"Not all who wander are lost."
Region: Texas Composter Greenhouse Cactus and Succulents Organic Gardener Hummingbirder
Herbs Garden Art Dragonflies Garden Ideas: Level 2
Image
Ecscuba
Jan 24, 2015 3:41 PM CST
@sooby oh, I hope that's not what it is -- the article makes it sound ominous. Yikes !
[url=Www.carolmedfordart.com]Www.carolmedfordart.com[/url]
My passion is painting but gardening is running a close second.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Jan 24, 2015 4:14 PM CST
Try the potato disks on the soil and see if they attract any larvae, then that would be diagnostic. The larvae are fairly distinctive because they have a shiny black head. It's possible to identify the adult flying gnats if they're caught on sticky yellow cards, but they're very small and one would need to be able to see the vein pattern on the wings to ID them. If you have a camera that can take macros it might be possible.
Name: Carol Texas
Central Texas (Zone 8b)
"Not all who wander are lost."
Region: Texas Composter Greenhouse Cactus and Succulents Organic Gardener Hummingbirder
Herbs Garden Art Dragonflies Garden Ideas: Level 2
Image
Ecscuba
Jan 25, 2015 10:07 AM CST
@ sooby thank you. I'll try that. I read on line somewhere to sprinkle the soil with cinnamon and I did that last night -- all the plants in the GH. Also it said to put out a dish of sugar water (preferably a yellow dish). I put out two yellow and one blue. The yellow caught a bunch of them. Blue - they ignored.
The population seems to be way down this morning (but not all gone). I'll do the potato disk test. Thanks much,
[url=Www.carolmedfordart.com]Www.carolmedfordart.com[/url]
My passion is painting but gardening is running a close second.

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