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How to Kill Whiteflies on Gardenias

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How to Kill Whiteflies on Gardenias

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Overview

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.

Step 1

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.

Step 2

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

Step 3

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.

Step 4

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.

Things You'll Need

  • Vacuum
  • Pruning shears
  • Insecticidal soap, horticultural oil or pesticide
  • Beneficial insects

References

  • Golden Harvest Organics: Dealing With Whiteflies
  • Walter Reeves: Whitefly
  • University of California: Whiteflies
Keywords: kill whiteflies, whiteflies gardenia, spray whiteflies

About this Author

Emma Gin is a freelance writer who specializes in green, healthy and smart living. She is currently working on developing a weight-loss website that focuses on community and re-education. Gin is also working on a collection of short stories, because she knows what they say about idle hands.

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