Whether the flying insects infesting the soil are in your garden or in your houseplants, chances are they are fungus gnats, which thrive in moist, organic-rich soil conditions. In general, fungus gnats cause little damage to most plants. Larvae, though, feed on roots, so large infestations can make some plants more susceptible to root rot. Because eggs hatch one or two times a week, generations can be present at the same time. For best results in getting rid of fungus gnats from your soil, implement more than one control strategy.
1. Remove the debris, such as decaying organic matter, that accumulates on top of the soil. Perform this task regularly, about once a week, to keep the soil unattractive to fungus gnats.
2. Irrigate only when the plants need water, because overwatering encourages fungus gnats. Typically, most plants grow well when the soil is watered after it dries 1 or 2 inches deep.
3. Set up sticky yellow fly traps near the infested soil. You can hang them from a nearby shrub or tree and some traps have a stake that you can insert into the soil. Check the traps one or two times a week and replace as needed.
4. Spray adult fungus gnats directly with a ready-to-use spray that contains pyrethrin or pyrethroid. Repeat this every three days for two weeks until the gnats are not an issue.
5. Mix a Bacillus thuringiensis var israelensis pesticide product with water to kill fungus gnats in their larvae stage. Use this solution to water the soil at watering time until it is thoroughly wet. Repeat each week until the infestation is eradicated. Mix this product with water according to label instructions. For example, mix a 37.4 concentrate of Bacillus thuringiensis at a rate of one-third to 2 1/2 ounces per 10 gallons of water, depending on the severity of the infestation.
6. Mix beneficial nematodes with water and spray evenly over the infected soil to make the surface thoroughly wet; this controls gnat larvae. Then water the soil with one-fourth inch of water. Keep the soil moist for one week so the nematodes perform their best. Mix the product as indicated on the label, but about 1 teaspoon of nematodes per gallon of water often suffices. Store nematodes in the refrigerator as soon as you get them; they will keep for up to three weeks.
Things You Will Need
- Yellow fly traps
- Ready-to-use pesticide
- Bacillus thuringiensis var israelensis
--Ads-- Flying Plant Insects Sticky Traps www.tagreat.com Perfect detector of insects invasion (such as aphids, leaf miners, fungus gnats, thrips, white flies, black flies, midges. ) and infest. --Ads--