Banker plants refer to non-crop plants that are used to raise beneficial insects for the purpose of controlling greenhouse pests. They work best preventatively, before the pest becomes established in the crop. Increasing the beneficial insects early on will increase their effectiveness and lead to a higher success rate as well as reducing cost of purchasing biocontrol agents.
Aphid Banker Plants
Aphid banker plant systems were developed in the 1990's in the Netherlands by Dr. Pierre Ramakers and now they are used globally in many crop settings. The idea is to culture a population of cherry oat aphids (Rhopalosiphum padi) that can only survive on monocots, such as barley, oats, wheat or rye. Aphidius, the aphid parasitoid, can then use these populations to breed and spread throughout the greenhouse. Aphid banker plants are designed for Aphidius species, but they can also attract and support other beneficial insects such as syrphid flies, lady bugs, lacewings and Aphidoletes.
Visit our product page to order aphid banker plants. For details on setting up an aphid banker plants system, please review the following.
Aphid Banker Plant System for Greenhouse IPM, Step by Step, 2017
The Basics of Banker Plants, Greenhouse Canada, 2024
Saving 'Bank' with Banker Plants, ONfloriculture, 2024
Pepper Banker Plants
Pepper plants (Purple Flash) are an excellent host for Orius insidiosus, the minute pirate bug. The high protein pollen of pepper plants supports development of Orius which contributes significantly to thrips control. Orius also feeds on moth eggs and two-spotted spider mites. Start early for best results as this system takes time to get up and running (14-16 weeks).
Thrips Banker Plants, UConn Extension, 2019
Banking on Bankers, Greenhouse Canada, 2018
Orius Banker Plant Systems for Controlling Thrips in Greenhouses, Michigan State, 2025
Alyssum Banker Plants
Alyssum plants (Lobularia maritima) support multiple species of biocontrol agents. Alyssum is highly attractive for syrphid flies, ladybugs, lacewings, parasitic wasps and other pollinators. For crops without enough nectar, the alyssum provides parasitic wasps with extra energy needed to fly and reproduce.
The Natural Power of Biological Control, Ronald Valentin, 2024
Dalotia Breeder Box
While not a plant system, raising Dalotia for thrips and fungus gnat control is often done in a tub or box-like container. Watch our Sound Horticulture video to learn more.
For more details on starting a banker plant system or breeder box for your growing system, please contact Sound Horticulture (360) 656-6680.