How To Get Rid Of Tent Caterpillars

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Tent caterpillars can be a real nuisance in your garden. They will quickly defoliate the trees. This is my quick and easy way to kill tent caterpillars in my trees non toxic and completely harmless to my children, pets and trees. | www.homestead-acres.com
You’re here because tent caterpillars are eating your trees right?

I’m not surprised caterpillars are a big pest for trees and especially fruit trees. 

A large nest of tent caterpillars can quickly defoliate your trees, but don’t worry I have a very easy way to kill the caterpillars in your trees that uses just ONE easy ingredient you have in your home right now.

If your trees are larger and more mature the damage the caterpillars will do normally won’t kill your tree.  Healthy trees will simply grow back a new set of leaves.  This will still cause the tree stress and possibly the loss of its blossoms and of course means you’ll also lose your fruit harvest.

Tent caterpillars | www.homestead-acres.com

However, if your trees are younger the stress of losing their leaves can really set back their growth or worse yet, kill the tree.

I remember when our apple trees were younger.  The first year they started to produce well we had a large infestation of tent caterpillars.

It seemed like they lost their leaves overnight and the stress caused them to drop all of the young apples that had just started to form.  We lost our apple harvest that year and I knew I never wanted to let that happen again.

I found a way to organically kill the tent caterpillars in our trees and I can’t wait to share it with you so you can protect your trees too!

But, before I share that with you there are some important things about these caterpillars you need to know.

To control a pest in your garden you need to understand its life-cycle.

Tent caterpillars are one of the most social types of caterpillars and these are part of the moth family Lasiocampidae the main variety we have in our area is the eastern tent caterpillarThe female moth lays her eggs early in the spring in clusters of 200 to 300 eggs.  These eggs grow quickly and in 3 weeks the caterpillars will be fully formed.

These baby caterpillars stay in a dormant state until the following spring when they hatch very early in the spring.  Their hatching is timed to match the new budding of the trees.

Tent caterpillar

After they hatch the little caterpillars start to build a silk nest.  These start out very small and are made larger as the caterpillars grow.

It is best to start checking your trees in the early spring for these small nests.  Look especially at the forks of the tree branches as these are their favourite place to build nests.

The young caterpillars come out 3 times a day to feed.  Normally this is just before dawn, mid-day and just after the sun has set.  The caterpillars leave their nest together and travel to a feeding site and then return to their nest when they have finished feeding.

It is important to know this because my method of killing tent caterpillars works the best when they are all in the nest together!

Tent Caterpillar Cocoon

The last stage of the caterpillars life they leave each other to find a place to form their own cocoon.  After forming a cocoon the moths will hatch in about 2 weeks time.

The moths are nocturnal and you have likely noticed these medium sized brown moths flying around at night.  They breed not long after hatching and the females die not long after laying her eggs.

Tent Caterpillar Moth

Now that you know the life-cycle of the tent caterpillar it makes much easier to control.

How To Kill Tent Caterpillars In Your Trees

A very common way of destroying tent caterpillar nests is to burn them with a small propane torch.  This is the way I learned growing up and I’ve seen many people kill caterpillar nests this way.  But there are problems with this method.

  1. Burning the caterpillar nests can damage your tree and leaves large ugly black patches behind.  I’ve done this before and it really does look ugly!  A way around this is to cut out the branch after you’ve burned it.  But this again damages the tree and what if your nest is up high in the tree or on larger branches?  You really don’t want to cause a lot of damage to your trees.  After all isn’t that what you’re trying to protect them from?
  2. Burning the nest with a torch can also be difficult to do when the weather is windy as small torches are easily blown out.  If the nest is high up in your tree climbing it or using a latter isn’t the safest idea when using a torch either.

So the really easy way that we came up with for killing tent caterpillars is simply vegetable oil!

Really, it’s that simple!

The key to making this work is knowing the caterpillars life-cycle.  You need to wait until the caterpillars are all in the nest together, then spray the nest well with vegetable oil.  This works because, insects breathe through their skin.  When they are coated with oil they can’t breathe and die very quickly.

You can use new vegetable oil but I’m a pretty frugal person so I save our used oil from the deep fryer.  Just pour the leftover oil into a spray bottle and keep it on hand for when you spot these caterpillar nests in your trees.

I love using these heavy duty spray bottles.  They are so handy in the garden because they are a stronger plastic than most spray bottles and have easy to use measuring marks on the side.  I often use these not only for making an oil spray for caterpillars but also to apply mixtures of tea tree oil or liquid fertilizers as a foliar spray.

 The Benefits Of Using Vegetable Oil

  1. It kills the caterpillars quickly and doesn’t leave any nasty black spots in your trees.  The nest if left alone will fall apart and break down quickly on its own.
  2. It is also so much easier to spray the nest that is higher up in your tree with the oil then it is to try to burn them with a torch.

 

Would you like to see just how well this works?

Watch my video where I show you just how easy this method of controlling caterpillars in my fruit trees really is.  I just love finding easy and safe ways to control pests in my garden don’t you?

Download a tip sheet to help you remember how to spot tent caterpillars in your garden and control them safely!

 

How to get rid of tent caterpillars naturally | www.homestead-acres.com

 

Are you fighting with cucumber beetles in your garden?  See my quick and easy way to get rid of them!

 

Kim Mills is a homeschooling mom of 6 and lives on an urban homestead in Ontario, Canada. Blogging at Homestead Acres she enjoys sharing tips to help you save money, grow and preserve your own food.


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  • Brenda Myhrer says:

    What type of oil?

  • Chris says:

    Hi Kim,
    Thank you very much for sharing your method of killing tent caterpillars. Vegetable oil works a lot better than burning them. This was a revelation to me.

  • Suzanne Lalonde says:

    Hi, we are having a investatation of tent caterpillars are are now attacking my hostas and other leaf bushes in my garden, can vegetable oil be directly sprayed on these. There are no nests.

    • Kim says:

      If you spray the oil on leaves in sunny or hot weather it might burn the leaves. I would try it on a test patch first if you’re worried. Another idea is to use a few tablespoons of dish soap in some water. We have used that before and it worked ok too!

      Another option is to use BTK spray (organic) it won’t kill them instantly but when they eat the leaves it will kill them.

    • Carolyn says:

      Dish soap mixed in water works good too. I had read that Dawn was best but I used Palmolive and it worked within the hour.

  • Autumn says:

    What a great recommendation. I will definitely try this. And it’s especially exciting from a fellow Ontario native. Thanks so much Kim Mills.