I want to release some beneficial insects in my garden to help control aphids and other insect pests. Can you recommend a company where I can buy some?
Some retail nurseries sell lady beetles and a few other beneficial insects. You can also find a list of suppliers of beneficial organisms in North America at: SUPPLIERS OF BENEFICIAL ORGANISMS IN NORTH AMERICA.

Most gardens and landscapes already have a complex of beneficial insects and other natural enemies which control pests. You can increase the effectiveness of these beneficial biological control agents by not applying insecticides which leave a persistent toxic residue on plant foliage. If you need to use an insecticide, try insecticidal soap or horticultural oil which kill pests on contact and are less harmful to beneficial insects. Plants should also be washed periodically with a forceful spray of water to remove dust and other debris which interferes with the activity of beneficial insects.

Ants may also interfere with biological control and make pest populations worse. They feed on sugary secretions of aphids, whiteflies and other sap sucking pests and drive off or kill beneficial insects which help control the pests. Ants can be controlled with toxic bait which they take back to their nests. Trees can be protected from ants with a sticky barrier like Tanglefoot which can be applied on a strip of paper wrapped around the trunk.

 

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