potting soil bugs - Knowledgebase Question

SOUTH DEERFIELD, Ma
Question by boredstr8
June 28, 2009
I bought a bag of potting soil last week from homedepot and now all my indoor plants that I transplanted have these little bugs crawling and flying all over the soil and the pots. What can I use to get rid of the bugs but not kill my houseplants?


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Answer from NGA
June 28, 2009

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What you describe sound like fungus gnats. These pesky insects feed and breed in moist potting soil. Here are two strategies for controlling them: They breed in moist potting soil, so you can break the breeding cycle by allowing the surface of the soil to dry out. If you have plants that need moist soil simply place a quick draining and fast drying layer of gravel or sand on top of the potting soil. This will act as a barrier to the soil. Or, you can drape plastic wrap over the soil (cut a slit so you can place it close to the stems of your plant, then overlap the cut ends so the pests cannot find a way to the potting soil). You have to be a little patient with this method because you have to wait through the next generation's maturation before they are gone for good. In other words, once the generation now already in the soil become adults and die off without being able to reproduce, there should be no more gnats. Another method is to use a product called Gnatrol as a soil drench, another is to use an insecticidal soap as a soil drench. Of course, always follow the label instructions carefully. I hope this helps!

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