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Tachinid Fly Garden Benefits and How to Attract Them

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Tachinid Fly Garden Benefits and How to Attract Them

Whether you know it or not, you’ve seen a tachinid fly before. It looks like the common house fly, but it’s incredibly beneficial to your garden.

Tachinid flies are one of the best native insects in agriculture you can ask for in regards to natural pest control. Besides, they’re super easy to lure into your garden.

Below, we’re going to explain how to attract them and precisely why you want these ugly little angels amidst your greenery in the first place.


This is a very successful fly, with over 1,520 genera consisting of more than 10,000 described species. America’s population of the tachinid fly (Tachinidae) consists of well over 1,300 different species spread out across nearly every single state.

They are also found in other parts of the world. This is great news for all of you potential gardeners. However, it’s really bad news for all the bugs these guys eat and destroy.

You don’t need to worry about these little guys attacking your plants. They’ll leave them alone almost entirely in their search for food and for suitable hosts with whom to lay their eggs.

Types of Tachinid Flies

You actually have a few varieties to keep an eye out for in the garden.

  • Voria ruralis- Specializes in cabbage looper caterpillars as both a food and an egg source.
  • Lydella thompsoni- Likes the European corn borer and, as such, is a dear friend of corn farmers. This species was actually introduced a few times to different regions around the US.
  • Myiopharus doryphorae- The Colorado potato beetle is a favorite of this one for an egg source, which of course kills the poor beetles, paving the way for more parasitoids.

Different types of these flies will exist at different points around the world. Therefore, research which ones you’re most likely to see in your area and what sort of pests they go after.


Tachinids are parasites that resemble house flies. They come in different colors (gray, striped, dark red, and black), sizes, and shapes.

They certainly aren’t picky at all, and they lay their eggs on the bodies of targeted host insects.

You can increase your chances of seeing these parasitic flies by paying close attention to the types and varieties of plants you’ve put down, as well as the signs to look for later on.

For instance, if you happen to see a caterpillar crawling around with little white dots on its back, leave it alone. It’s been infected with tachinid fly eggs and will soon die. This will later release a new little hoard of larvae into the world to continue their good deeds for your garden.

Reproduction Methods 

If you’re squeamish, skip to the next paragraph, because the reproduction methods of this little fly are something straight out of horror science fiction.

Adult flies are looking for a place to lay eggs, and if they see a big, juicy caterpillar or beetle, they will land and insert their eggs directly into the host’s body.

Whether eaten or injected, the eggs are toxic to the host. Once the babies hatch internally, they start off by eating whatever the host can live without at first. This allows them to continue moving about normally until this non-essential tissue runs out.

That’s when they prey on the vital organs, killing the host quite swiftly. But by this point, the young have developed enough to begin the pupating process regardless of the status of the host.

Once the larvae hatch inside the host bug, the host bug eventually dies, and the larvae escape to begin a new life cycle. A single fly can expect to be a grandparent twice over in just under a year.

Benefits for Your Garden

If you’re wondering how to get rid of tachinid flies, don’t! They are very beneficial.

These teeny little bugs are great to have around because they prey on most of the smaller, more annoying pests you see flying and crawling around your garden.

Whatever is ‘bugging’ you, they will likely kill and eat it pretty quickly. However, tachinid fly predators mostly go after the larvae or eggs of their prey. These include:

  • Caterpillars
  • Sawfly Larvae
  • Earwigs
  • Mexican Bean Beetles
  • Cucumber beetles
  • Squash Bugs
  • Potato Bugs
  • Japanese Beetles
  • Grasshoppers

In addition to killing pests, these parasitic insects also help pollinate the plants around them, much like honeybees. This makes them especially helpful at higher elevations that honeybees can’t survive at.

If you don’t have a lot of bees around, you’ll definitely want to take notice of this little insect. They may be what ends up pushing your garden over the brink of survival as the season progresses.

How to Attract Tachinid Flies to Your Garden

If you genuinely want to keep these useful farm insects, make sure to plant a highly diverse garden that will be appealing to a whole variety of pollinators.

Doing this will attract the beneficial little predators straight to you, drawn in by the frenzy of prey items that become available.

You can even purchase some pollinators for your garden, provided that you have enough food around to keep them happy and well-fed throughout the planting season.

If your garden is full of enough flowering herbs, then expect to see a lot of these good guys once the heat of the season hits.

Plants that attract tachinid flies include dill, carrot, sweet clover, asters, angelica, buckwheat, and yarrow.

Keeping Tachinidae Once You’ve Got Them

This can be a tricky part. Depending on what you’ve planted, you may see an upsurge or a downtick in beneficial flies throughout the season.

They’re most attracted to flowering herbs planted in rich soil, especially plants from the Aster family. Herbs such as dill, parsley, cilantro, chamomile, feverfew, daisy, and ox-eye.

You can even leave certain weeds behind to keep them interested, such as the wild carrot and the sweet clover.

Potential Problems 

It’s always possible that they could be a little too good at their jobs.

If one day you suddenly notice that the caterpillar population has plummeted and, by sheer coincidental luck, you just so happen to be in the process of putting together a beautiful butterfly garden, then tachinid flies could easily be the source of the issue.

The tachinid fly larvae will burrow their way inside worms and caterpillars, later killing them. Hence, silkworm ranchers consider this normally highly beneficial fly to be a supreme pest and dangerous nuisance.


It’s always a good idea to attract as many parasitic insects to your garden as possible, even if you have to release them. However you decide to do it, the tachinid fly is one of the best choices you can make as a gardener starting out for the season.

Image via commons.wikimedia.org

Andre Campbell

Organic farmer and co-founder of Dre Campbell Farm. He appreciates everything in nature—sunshine, plants, animals, and human life.

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