Plan the perfect garden with our interactive tool →

How to Kill Whiteflies on Gardenias

...
bud of gardenia image by Igor Zhorov from Fotolia.com

Whiteflies are hard to miss. Every time you water or walk by your gardenias, they fly up in pesky white swarms. Or, you may have noticed their eggs on the underside of your gardenia’s leaves. Whatever the sign, it’s important to kill white flies as soon as you notice them. These insects spread rapidly, especially in the warm southern areas, and can quickly overwhelm a gardenia bush. Large enough numbers of them will strip its foliage, potentially spread viruses and diseases, and maybe even kill a weakened plant.

Destroy any whitefly eggs that you may find growing on the underside of your gardenia's leaves. Prune the leaves and dispose of them. Crush the eggs or spray them with horticultural oil.

  • Whiteflies are hard to miss.
  • Or, you may have noticed their eggs on the underside of your gardenia’s leaves.

Suck large swarms of whiteflies up with the hose on your vacuum.

Spray the adult population. Whiteflies are quite susceptible to a number of controls: insecticidal soap, neem and horticultural oils, and pesticides like purethrum, permethrin and bifenthrin. The trouble lies in the application. All of these methods work by contact, and whiteflies are quick little blighters. Whichever method you choose, you will likely need to spray your gardenias once weekly for a month. And when you do spray, aim at the underside of your gardenia's leaves where the whiteflies live.

  • Suck large swarms of whiteflies up with the hose on your vacuum.
  • And when you do spray, aim at the underside of your gardenia's leaves where the whiteflies live.

Release beneficial insects into your garden. Ladybugs (Delphastus pusillus), green lacewings (Chrysoperla spp.) and predatory mites (Euseius spp.) all feed on whiteflies. If you release beneficial insects, abstain from spraying your gardenias. The pesticides will kill the beneficial insects as well.

Tip

Your whiteflies may be a sign that your gardenias are suffering from phosphorous or magnesium deficiencies. Large populations of whiteflies can be difficult to control. If a combination of control methods fails, you may need to uproot your gardenias and replace them with a whitefly-resistant plant.

Related Articles

Yellow Leaves on a Butterfly Bush
Yellow Leaves on a Butterfly Bush
How to Clear Pests from Hydrangeas
How to Clear Pests from Hydrangeas
How to Feed Gardenias
How to Feed Gardenias
Insects That Attack Citrus Trees
Insects That Attack Citrus Trees
How to Get Rid of Spider Mites Off Hostas
How to Get Rid of Spider Mites Off Hostas
How to Grow Gardenia Plants in Georgia
How to Grow Gardenia Plants in Georgia
Hydrangeas & Pests
Hydrangeas & Pests
Do Gardenias Lose Leaves in the Fall?
Do Gardenias Lose Leaves in the Fall?
Soapy Water for Treating Rose Bushes
Soapy Water for Treating Rose Bushes
Lantana Pests
Lantana Pests
Bugs on Plumeria Plants
Bugs on Plumeria Plants
How to Get Rid of the Insects on Your Lemon Tree
How to Get Rid of the Insects on Your Lemon Tree
How to Grow Gardenias in Virginia
How to Grow Gardenias in Virginia
How Do You Kill Evergreen Mites?
How Do You Kill Evergreen Mites?
How to Remove Aphids on Mint
How to Remove Aphids on Mint
Spider Mites on White Gardenias
Spider Mites on White Gardenias
Little Green Worms on Jasmine Plants
Little Green Worms on Jasmine Plants
Are Gardenias Annuals or Perennials?
Are Gardenias Annuals or Perennials?
The Leaves on My Gardenia Bushes Are Turning Brown on the Ends
The Leaves on My Gardenia Bushes Are Turning Brown...
Garden Guides
×