Why You Shouldn't Buy Ladybugs for Natural Pest Control in Your Garden

Close-Up Of Ladybug In Home Garden

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Got ladybugs? Encourage native ladybugs in your garden instead of buying wild-harvested ladybugs to manage pests.

In "10 Online Gardening Communities You Should Join," I recommended Twitter because rarely a day goes by that I don’t learn something new.

Case in point: I was following a discussion when Suzanne Wainwright (also known as @BugLadySuzanne) mentioned that ladybugs that can be purchased for your garden are trapped in the wild and can carry parasites and diseases that will infect ladybugs native to your area.

As an entomologist working for more than 20 years and specializing in biological pest control, I wanted to ask her more about this practice because I always assumed ladybugs were raised in a more sustainable manner. Isn't buying them to release in a garden a good thing?

Here's what I learned.

Treehugger: How common is it that trapped ladybugs are available for sale to gardeners?

Suzanne Wainwright: Almost all ladybird beetles sold in the United States are wild harvested.

How much of the retail market does this consist of?

For homeowners buying the convergent ladybird (Hippodamia convergens) and the Asian lady beetle (Harmonia axyridis), those are all wild harvested.

The only commercially produced (reared at a commercial insectary) “red” ladybirds are the two-spot ladybird (Adalia bipunctata) and the spotted ladybird (Coleomegilla maculata).

There are a few other specialist ladybirds like Delphastus pusillus, Stethorus punctillum, and Cryptolaemus montrouzieri but homeowners do not typically buy them. They are used more by commercial growers because they specialize in feeding on specific pests.

Are there ladybug "farms" gardeners can order from if they don’t want to support the trapping of ladybugs in the wild?

Companies like Insect Lore have them for sale, but often homeowners find them too expensive. An insect that works better as a general predator in the garden is the green lacewing. These can be purchased from Beneficial Insectary for homeowner use.

If someone does buy ladybugs, how can they keep them from flying into a neighbor's yard once released?

You typically can not keep the ladybirds around unless you cage them on the plant. Even then, there is no guarantee they will feed on the pest insects because they are harvested while hibernating. Sometimes harvesters will hold the ladybeetles through their hibernation until they are ready to feed again, but even then, this does not mean they will stick around.

How serious of an issue are the parasites and diseases these wild-caught ladybugs carry? Do they affect other beneficial insects?

If the parasites are not in the area, you could be introducing them. I have seen this happen in greenhouse settings. The parasites only attack ladybird beetles. Research has shown that 3–15 percent of harvest ladybird beetles carry the internal parasite Dinocampus coccinellae. This same study found many of the harvested beetles to be infected with Microsporidia, a disease that shortens the ladybird’s life span and reduces the number of eggs laid by the female ladybird.

What can gardeners do to naturally attract ladybugs?

Many ladybird beetles feed on pollen as part of their diet as adults. Provide heavy pollen-producing plants like sunflowers and other composite flowers. Also, do not spray pesticides. Even approved for use in organics, pesticides can have impacts on ladybird beetles.

It’s important to learn to identify all life stages of the ladybird beetle. Most only know adults and may not recognize the immatures which do a lot of the feeding on other insects and mites.

I once saw a ladybug "house" in a garden that didn't have any ladybugs at home. Are these a waste of time?

Yes, waste of time.

Is there something else homeowners can buy or make that would make a good "home" or nesting environment for ladybugs?

Since ladybird beetles have different overwintering sites I would think you would have to look at the region and then the species.

Also, ladybirds don’t “nest." In colder climates they hibernate. How and where they hibernate depends on the species. For example, many northerners know that Harmonia axyridis (Asian ladybird) likes to overwinter in people's houses, where Coleomegilla maculata (spotted ladybird) likes to be in the leaf litter outside.

You can also get PredaLure, a pheromone that the USDA has shown attracts ladybirds.


I want to thank Suzanne for taking the time to answer these questions. I’m glad to learn that those little houses don’t do anything to increase the ladybug population in the garden because I was planning on installing one.

A few years ago, when I stopped using chemicals in my garden, I saw an increase in both pests and beneficial insects like ladybugs. Whenever the aphid population increases, I trap the ladybugs in my garden and place them on the affected plants.

In this video I recorded in my garden I placed a ladybug on a poppy seed pod that was being attacked by aphids. The ladybug made short work of the pests, and I was able to harvest poppy seeds. The next time you have a bug problem in your garden, seek out the beneficial bugs and start a bug fight instead of reaching for pesticides.

View Article Sources
  1. Bjornson, Susan. “Natural Enemies of the Convergent Lady Beetle, Hippodamia convergens Guérin-Méneville: Their Inadvertent Importation and Potential Significance for Augmentative Biological Control.” Biological Control, vol. 44, 2008, pp. 305-311., doi:10.1016/j.biocontrol.2007.10.001

  2. Lee, Jana C., “Effect of Methyl Salicylate-Based Lures on Beneficial and Pest Arthropods in Strawberry.” Environ Entomol, vol. 39, 2010, pp. 653-60., doi:10.1603/EN09279