pestilence - Knowledgebase Question

apple valley, Ca
Question by dazzllyng
June 15, 2009
how do you successfuly get rid of gnats in the house and outside!


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Answer from NGA
June 15, 2009

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Here are two strategies for controlling fungus gnats indoors. 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. Outdoor control is more difficult. The key is to allow the soil to dry out slightly between waterings. This includes your lawn area. It can be difficult to strike a balance between providing adequate water to your lawn and plants and yet allowing the top of the soil to dry out enough to discourage gnats. Hope this information helps.

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