Last updated on April 24th, 2022
Our site is reader supported, this means we may earn a small commission from Amazon and other affiliates when you buy through links on our site.
If you’ve ever thought a caterpillar wasn’t a threat to your garden, you were wrong. Caterpillars might seem cute, but while they prepare to turn into a butterfly, they can destroy an entire plant whilst finding energy. A single caterpillar can grow exponentially in a given week, surviving off your garden plants. In fact, if you don’t check your garden daily, you might not notice the damage to your tomatoes or cabbages and many other plants until it’s too late.
So, what can you do to get rid of these critters before they eat your entire plant, but without using pesticides or chemicals? Below are 10 organic ways to resolve your pesky caterpillar problem.
Before we get into it, some of the measures include mixing organic sprays. With all sprays with highly recommend spraying a small part of the plant first and leaving it for a couple of days. If everything is fine and the plant has not been affected negatively, then spray the rest of the plant.
Organic methods you can use to stop caterpillars
1. Spray your plants with soap and water
Start with regular soap and water. If you dissolve organic liquid soap in a container of warm water and then spray it on the affected plants it will make the surface of your plants slippery so that they won’t be able to walk on it and eat your plants. Don’t worry, it won’t harm them, just force them to look elsewhere for nourishment.
2. Bacillus thuringiensis
This is a natural bacteria that exist in your soil. It has a protein in it that, to soft pests like caterpillars, is highly toxic. This will paralyse their digestive system and force them to stop eating. It is toxic to caterpillars, but for humans, good insects and animals it is completely safe. Don’t worry about using it in your garden with produce; just wash your produce before you eat it.
*Tip: Make sure you get Bacillus thuringiensis that is organic and labelled thusly by the Organic Materials Research Institute.
3. Make a garlic and pepper spray
You can make a potent mixture, not just for your dinner, but for pests. A mixture of 1 tablespoon of dried red pepper flakes with 1 whole onion (that has been minced), 1 teaspoon of soap and one gallon of water. These contents should be blended together well and after you have done this, let the mixture remain for 24 hours, to really allow the contents to bind with one another. After that, you can fill a spray bottle and tackle any hungry caterpillars.
*Tip: This mixture works well on worms or aphids as well, so you can make a large mixture and save it for any further pest problems throughout the season.
4. Mix some chilli spray
You can make a similar mixture to the one above, but one that is a chilli spray, to ward caterpillars off as well. On the stove, boil ½ gallon of water with 3.5 ounces of dried ground chillies for five minutes. Remove it from heat and mix ½ gallon of cold water with 3 drops of organic liquid soap. Stir the mixture and allow it to cool for a few minutes.
*Tip: If using this method you should do a test application beforehand. Place a small amount of a leaf (or two) of the affected plants. If there are no adverse effects on your plants within 24 hours, then you can fill a spray bottle and apply it as needed to the entire plant.
5. Make a spray using vinegar
Vinegar will naturally deter many pests, caterpillars included and a mixture of 4 litres of water with 2 tablespoons of vinegar is all you need. Spray it onto the affected plants and it will keep the caterpillars away.
- PERFECT FOR COOKING - Use in vinaigrettes, sweet-and-sour dishes, marinades, pickles, chutneys, and butter sauces. Or infuse with fresh herbs to make flavoured vinegar. Whatever the occasion our Fresh White wine vinegar will be perfect.
- FABRIC SOFTENER - This white vinegar is perfect for households that have pets and children around as well as commercial premises where health and safety is of paramount importance
- FOR GARDENING - Garden Weeds, Odours, Limescales to name a few whilst having none of the side effects which are normally associated with cleaning products since it leaves no nasty toxic chemicals and fumes behind.
- 5 LITRE BOTTLE EXTENDED SHELF LIFE - Golden Swan White Vinegar perfect for any business large or small. We have guaranteed a 24 Month shelf life
- PRODUCED IN THE UK - 100% Environmentally Friendly - Our Golden Swan white vinegar is produced here in the UK
*Tip: If you have a snail or slug problem, spray vinegar directly onto the pests and in its raw form it will kill them.
6. Neem oil – use with care
Neem oil acts as a natural pesticide to ward off caterpillars and similar tomato hornworms. This method should be used in small amounts because it can prove harmful to beneficial bugs as well. For this method, dilute a very small amount of neem oil, no more than 2 ounces, into a gallon of water. Mix it well and apply it to the affected in the late afternoon.
- 100% pure, unrefined, cold pressed, Virgin Neem Oil. No additives, chemicals or any other nasties, just pure Neem Virgin Oil.
- Rich in essential fatty acids and Vitamin E, a powerful antioxidant.
- Combined with other carrier oils and essential oils, Neem Virgin Oil is ideal for making your own skincare formulations.
- Suitable for all skin types, although particularly good for those with dry, inflamed and mature skin.
- Not tested on animals and vegan friendly.
7. Encourage birds into your garden
Another option is to bring a natural predator into the mix, figuratively. Birds eat caterpillars, so you can place a bird feeder or birdhouse near the affected plants and let the birds naturally reduce your caterpillar population.
You can also introduce chickens into your garden. They will wander about and eat all the caterpillars for you.
Learn more about how to attract birds into your garden from our article here
*Warning: If the caterpillar problem is on your fruit trees, avoid this method because it draws more birds to your fruit too.
8. Grow plants that repel caterpillars
Just as you can introduce birds as natural predators, you can introduce new plants that naturally repel caterpillars. These include sage, mugwort, peppermint and lavender. All of these will strongly repel caterpillars. Of course, with this method you also get the benefit of delightfully smelling plants and some that can even be used when cooking.
- Top Quality 9cm Herb Plants Lincolnshire grown.
- Seasonal Selection Of Top Quality Lincolnshire Grown Herbs
- All These Herbs Are Perfect For The keen Gardener Or Cook
- Perfect To Start Or Expand Your Herb Garden
- Selection may vary with seasonal availability.
9. Burlap
You can wrap your trunks with burlap and it will encourage the caterpillars to crawl under the burlap for shade during the heat of the day. This is, in effect, a trap because the purpose is to give a large infestation of caterpillars a place to hide when it is hot, and then once they are hidden, you can move them or kill them by hand.
10. Cover your plants with fine mesh netting
Finally, you can cover your plants with a thin mesh to prevent caterpillars from getting onto them, or more importantly stop the butterflies laying their eggs on your plants. This prevents the bugs from making direct contact, eating, or subsequently laying eggs which in turn creates more caterpillars.
- Protect your crops against pigeons, other birds and butterflies
- 5mm x 7mm black braided mesh
- Also ideal for protecting ponds from debris and Herons
- Light enough to be laid directly over crops and strong enough to be used to cover frames, cages or cloches
- If you are growing crops that need pollinating, remove this netting during flowering.
While these organic measures will help remove the caterpillars, it is in your best interest to keep them out. Preventative measures include keeping an eye out for eggs and disposing of them when you find them, making sure you don’t have lights in the garden that encourage moths to land and lay eggs, and making sure any infestation is done away with immediately.
Last update on 2024-04-07 / Affiliate links / Images from Amazon Product Advertising API
