How to Get Rid of the Whitefly

There are over 1,000 types of whiteflies, insects that look like small white moths or aphids. They group and breed in large numbers on the undersides of leaves. The nymphs and adults damage plants directly by sucking the sap and by transmitting disease. Once an infestation has taken root, it is difficult to remove. You may need to apply multiple treatments over a period of weeks, and you may even need to trim back your plants.

Part 1

Part 1 of 4:

Using Natural Solutions

Download Article

1
Vacuum the flies. Use a small hand vacuum, or hold the furniture-cleaning nozzle of a standard vacuum cleaner. Walk around your infested plants and suck the pests from the undersides of the leaves and foliage. This method is quick and straightforward, and it can remove whiteflies from all stages of the development cycle – from larvae to mature, plant-munching adults.^{[1]XResearch source} Vacuuming is most effective as soon as you notice an infestation.
- When the vacuum bag is full of whiteflies, trade it out. Seal the vacuum bag inside an airtight plastic bag, then put it into the freezer for at least 24 hours to kill off the insects. Once all of the flies are dead, you can empty the bag into the trash.
2
Remove the severely diseased leaves and branches. Use garden clippers to trim away as much as you can without killing the plant. You can also pluck infested leaves by hand. Look for white eggs and wingless "crawlers" on the underside of the leaves. Extremely infested leaves may be coated with a sticky or waxy fluid—honeydew—that is produced when the feeding nymphs ingest plant juices.^{[2]XResearch source} Leaves may also appear pale and wilted.
- Only trim as much as is healthy for the plant. If a particularly delicate plant is infested, you should cut away only the most infected leaves. If the plant is hardy, consider paring all the way down to the stem in order to stop the infestation in its tracks.^{[3]XTrustworthy SourceUniversity of California Division of Agriculture and Natural ResourcesExtension program of the University of California system devoted to educating and improving local communitiesGo to source}
- Make sure to properly dispose of the diseased leaves. Burn them or seal them into an airtight bag. If you don't handle the leaves carefully, the whitefly infestation may spread again.^{[4]XResearch source}
Advertisement
3
Prepare for repeated applications. The whitefly matures in 4 stages: from eggs, to nymphs, to pupa, to the adult fly.^{[5]XResearch source} Each method typically only targets certain stages in the fly life cycle. Thus, if a method targets the adult fly, you will need to keep applying that treatment until all of the existing eggs have matured into adults. You will need to be quick and diligent in your treatments to make sure that the newly-formed adults do not lay new eggs.^{[6]XTrustworthy SourceUniversity of California Integrated Pest Management ProgramResearch-based pest management program run by the University of California's Cooperative ExtensionGo to source}
- The nymph and adult flies are the only stages that cause physical damage to the host plant. Younger whiteflies will, however, mature into more damaging forms if left unchecked.
- For the best application timeframe, check the lifespan and stages of your particularly whitefly. Various species—including the Silverleaf, Fig, Greenhouse, and Bandedwing whitefly—each have a different lifespan.
4
Wash your plants with a soap solution. Put one good squirt of dish soap into 1 gallon (3.8 L) of water and mix well. Pay special attention to the undersides of the leaves, where most of the whiteflies live. Be aware that this method only kills the adult insect. Wash every 3 or 4 days to eliminate the new whiteflies as they emerge from pupa. Depending on the type of whitefly, you may need to continue this treatment for several weeks until the infestation is gone.
- If you use a highly-concentrated soapy solution, try applying it at the end of the day to avoid burning the foliage.
5
Introduce a natural predator. Various other species of insect love to feed upon the whitefly, and you might be able to rein in the infestation by bringing the right predator into the ecosystem. This predator will depend on the type of whitefly. Consider green lacewings, lady beetles, ladybugs, minute pirate bugs, big-eyed bugs, wasps, and damsel bugs.
- Be careful when intentionally introducing any new insect species to your garden. The predators may take care of your whitefly infestation – but you may soon find yourself contending with far too many of the new bug! Research before you act.

Part 2

Part 2 of 4:

Using Traps

Download Article

1
Use a sticky yellow pad. You can buy these traps in garden stores, or you can craft them at home. To make your own: coat a sturdy yellow surface (cardboard or wood) with a slow-drying adhesive substance. Glue, honey, motor oil, or petroleum jelly are good choices. Whiteflies are said to be attracted to the color yellow. When they flit to the yellow trap, they land and cannot free themselves from the glue.
- If you make your own trap, you may need to reapply the adhesive as it dries out. Glue, for instance, may dry within a matter of minutes or hours. Motor oil or petroleum jelly may be less immediately effective, but might stay sticky for longer.
- Make sure to remove the traps if you use a spray or a wash, or if you introduce natural predators.
Whiteflies tend to group on the undersides of plant leaves, and your trap will be more likely to catch the insects if it is near their natural habitat.
Take down the traps once the whitefly population is mostly dead, and you only find a few flies caught each day. The traps also have the potential to kill whitefly predators. Thus, they may not be well-suited to a low-level infestation unless these predators fail to keep the whiteflies in control. If the whitefly population bounces back and returns, then you can feel justified in resetting the traps.^{[7]XResearch source}

Part 3

Part 3 of 4:

Repelling the Whitefly

Download Article

1
Repel whiteflies with companion plants. French and Mexican marigolds tend to repel whiteflies, as do nasturtiums. Put these companion plants into your garden to keep the pests from returning! Be aware that this is a preventative measure, and not a great solution for existing infestations.^{[8]XResearch source}
- Pot marigolds and calendulas are not effective repellents. Make sure to use the right variety! If you aren't sure, visit a nursery and specifically ask about companion plants that repel whiteflies.
2
Spray your plants with a soap and water mixture. In a 32-ounce spray bottle, mix rubbing alcohol with water at a 2:5 ration. Then, add a tablespoon of liquid dish soap. Use the spray bottle to coat the leaves of plants that are at risk for whitefly infestations. If you don't overdo it, the spray shouldn't harm most plants – and it might keep the flies from putting down larvae.
- Consider spraying a small part of the plant and leaving it for a day or two to check if it has any negative impact on the plant before spraying the whole plant.
- Consider using a natural oil spray, such as Neem oil.
Earthworm castings, when added to the fertilizer bed of whitefly-infested plants, have been found to repel the flies within a matter of weeks or months.^{[9]XResearch source} As an added bonus, these castings are a rich natural fertilizer, and they can greatly stimulate plant growth. Ask for earthworm castings at a local garden store.
4
Cover the ground in a reflective material. Spread a layer of aluminum foil or reflective plastic mulch on the ground around susceptible plants. This may make it much harder for adult whiteflies to locate host plants, which in turn can bring make them less likely to successfully lay eggs.^{[10]XResearch source}
- This step will require special water considerations. Plants surrounded by plastic mulch will need a drip irrigation system.
- Do not use mulch in hot weather. Too much mulch may overheat the plants.

Part 4

Part 4 of 4:

Using Chemicals

Download Article

On one hand, a commercial pesticide is sometimes an effective way to quickly kill off the pests. The whitefly, however, is notoriously resistant to chemical products. Furthermore, these chemicals are often toxic to other organisms in the immediate ecosystem – including the plants and benign insects in your garden, pets and local wildlife, and even your family. Try to keep pesticides as a last resort.
Indeed, the eggs and pupae are able to resist most common insecticides. If you do use chemicals, be sure to switch them out in several-day rotations to keep your fly population from adapting. Even so, there is a strong chance that the whiteflies will adapt. You may unwittingly create a strain of pesky super-flies!

Expert Q&A

Search

Add New Question

Question
How do I get rid of mole crickets?
Lauren Kurtz
Professional Gardener
Lauren Kurtz is a Naturalist and Horticultural Specialist. Lauren has worked for Aurora, Colorado managing the Water-Wise Garden at Aurora Municipal Center for the Water Conservation Department. She earned a BA in Environmental and Sustainability Studies from Western Michigan University in 2014.
Lauren Kurtz
Professional Gardener
Expert Answer
Using a commercially available pesticide is the recommended treatment of a mole cricket infestation. Test the suspected area for mole crickets by wetting the area with a soapy water solution. If you see mole crickets come to the surface you have a problem. Treat the confirmed area with a pesticide such as Imidacloprid.
Thanks! We're glad this was helpful.
Thank you for your feedback.
If How.com.vn has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support How.com.vn
Yes No
Not Helpful 3 Helpful 1
Question
Our whiteflies seem to resist Neem Oil, soap, shooting them with water, and everything else we have tried. Any other suggestions?
Ninox
Top Answerer
Needle manure could be a good natural insecticide. If it doesn't work, you should try chemical ones.
Thanks! We're glad this was helpful.
Thank you for your feedback.
If How.com.vn has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support How.com.vn
Yes No
Not Helpful 18 Helpful 30
Question
Are whiteflies attracted to light?
Ninox
Top Answerer
Yes, whiteflies are attracted to light. Light traps can be very useful to get rid of the whitefly.
Thanks! We're glad this was helpful.
Thank you for your feedback.
If How.com.vn has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support How.com.vn
Yes No
Not Helpful 11 Helpful 28

See more answers

Ask a Question

200 characters left

Include your email address to get a message when this question is answered.

Submit

Video

Tips

Submit a Tip

All tip submissions are carefully reviewed before being published

Submit

Thanks for submitting a tip for review!

Warnings

Insecticides can be effective but can also be harmful when ingested. Much of the insecticides used for whitefly control have been linked to the death and severe decrease in numbers of bees, which are essential for pollination of flowering plants.
Thanks
Helpful5 Not Helpful0
Repeated application is often recommended for maintenance.
Thanks
Helpful33 Not Helpful17