x
 
 
Learn which plants thrive in your Hardiness Zone with our new interactive map!

How to Get Rid of Aphids in a Greenhouse

By Joshua Duvauchelle ; Updated September 21, 2017
Aphids can sometimes invade a greenhouse.

Aphids feed off of plants' juices by biting and sucking the plant stems and foliage. These critters may be small and almost unnoticeable, but they can weaken and kill greenhouse plants if not treated right away. Seal off your greenhouse to prevent new infestations, then treat the plants to eradicate this pest before it ruins your harvest.

Remove all weeds that are bordering the outside of the greenhouse in a 5- to 10-foot swath. Maintain a weed-free environment inside the greenhouse.

Netting with small mesh holes can help keep out aphids.

Seal all openings in the greenhouse to minimize the amount of aphids entering the area. Block out aphids' access to the greenhouse with a netting material that has a minimum mesh size of 434 mm, according to the Ontario Ministry of Agriculture. Cover all vents, windows and pipe entrances.

Release biological controls such as Aphidius spp parasitic wasp, Harmonia axyridis and Hippodamia convergens ladybeetle species into the greenhouse to naturally eradicate aphids. These insects can be obtained from many garden stores and nurseries.

Treat the greenhouse plants with chemical controls for faster removal. Spray the plants with a standard garden insecticidal soap if the infestation is light. Mist all exposed surfaces of the plant to smother aphids upon contact. Spray with a commercial garden insecticide formulated with kinoprene or pirimicarb and labeled for use against aphids if the infestation is heavy. Follow the product application guidelines for dosage, since toxicity varies by product.

 

Things You Will Need

  • Weeding equipment
  • Mesh netting
  • Biological controls
  • Insecticidal soap
  • Aphid insecticide

Tips

  • Regular random inspections of the greenhouse plants can catch aphid populations before they swell and become serious enough to require chemical control.
  • Weeds are common hosts for aphids and can contribute to constant re-infestations.

Warning

  • Aphids can sometimes be introduced on new plants. Rinse all new additions to the greenhouse with a strong blast of water to dislodge most pests, including aphids. Inspect the rinsed plant. If aphid activity is noticed, treat the plant with an insecticidal soap before bringing it into the greenhouse.

About the Author

 

Joshua Duvauchelle is a certified personal trainer and health journalist, relationships expert and gardening specialist. His articles and advice have appeared in dozens of magazines, including exercise workouts in Shape, relationship guides for Alive and lifestyle tips for Lifehacker. In his spare time, he enjoys yoga and urban patio gardening.