Sean has been in the industry of gardening and landscaping since 2006. He is also a certified arborist that specializes in plant health.
What Is Neem Oil?
Neem oil is one of the most valuable and environmentally friendly products available for organic pest control. The oil is extracted by applying high pressure to the fruits and seeds of the Azadirachta indica tree, which is an evergreen that's indigenous to the Indian subcontinent.
Neem oil affects insect pests by altering their hormones and bodily functions. After being treated with neem oil, some pests will cease to eat and reproduce. It may also affect the respiration of the pests or eggs. The oil applied to eggs will prevent the exchange of gases into and out of the eggs, thus preventing the eggs from hatching.
The oil does not provide instantaneous results, but this is just a compromise for using organic control. It's worth it to be organic!
Neem oil mixtures should be concentrated on the foliage of plants where pests reside. Strong formulations may burn foliage if applied on a sunny day, so care needs to be taken and directions need to be followed precisely as stated on the label. The mixtures are biodegradable and leftover mixtures contain nutrients that plants can uptake.
This article will cover:
- How to make neem insecticide.
- A list of pests controlled by neem.
- A list of diseases that can be prevented with neem.
Neem Insecticide Recipe
- 5 ml neem oil
- 1-2 ml dish detergent or insecticidal soap
- Warm water
- Add neem oil to a 1-liter sized container.
- Add dish detergent or insecticidal soap to the container.
- Vigorously mix the neem oil and soap together. The soap allows the oil to better mix into the water without separating. Dish detergent also has insecticidal properties.
- Slowly fill the container with warm water. Stir vigorously while filling!
- Pour the mixture into a sprayer.
- Spray liberally onto infested plants. Make sure to spray all of the foliage, branches, and stems. Use up all of the mixture, if possible, because it will become less effective over time. Pouring excess mixture into the soil will provide plants with nutrients.
- Apply only once a week until the infestation is under control. Neem oil impacts the reproduction of many pests but will not provide instant results.
Helpful Notes for Your Homemade Neem Insecticide
- Remember to keep shaking and agitating the mixture. Shaking the sprayer cannot be stressed enough. The results will be very poor if little to no agitation occurs. The neem oil will quickly float to the top of the container if agitation is not sufficient.
- Multiply the recipe to make larger mixtures if needed. Household misters, handheld sprayers, backpack sprayers, and even large broadcast sprayers can be used to distribute neem mixtures onto plants.
- Neem has a very earthly aroma that some people find unpleasant. Houseplants can be taken outside and sprayed, then brought back inside once the mixture has dried. This will help reduce the aroma.
Pests Controlled by Neem
Neem oil is effective against many pests, including:
- Beet armyworms
- Cabbage worms
- Spider mites
- Japanese beetle
- Sand flies
- Fungus gnats
- Moth larvae
- Mushroom flies
- Leaf miners
Neem mixtures kill many kinds of larvae and nymphs and are more effective when applied to the younger stages of pests compared to application to adult pests.
Neem oil is not harmful to mammals, birds, earthworms, and some beneficial insects as long as the oil is not concentrated on non-pest sources.
Treat neem oil as a chemical pesticide and use the same precautions to prevent reckless and unintended impacts on beneficial critters.
Diseases Controlled by Neem
Neem oil also controls several diseases that can become problematic. Mixing 2 teaspoons of neem oil into a gallon of water should be enough to control the diseases listed below:
- Leaf spot
- Powdery Mildew
- Black Spot
- Needle Rust
- Tip Blight
Remember to keep shaking and agitating the mixture to prevent the neem oil and water from separating. Agitation of the mixture is absolutely vital and results will be very poor if no agitation occurred.
The neem oil will float to the top of the water just like other oils when mixed with water.
- What Is Neem Oil?
Neem oil is a safe, gentle, natural solution for personal, household and garden use.
- How to Use Neem Leaf as a Natural Pesticide
As an organic farmer, I look for natural ways to solve any pest control problems. Neem is the ideal plant as it's a vigorous growing tree and both its leaves and seeds have repellent properties.
- DIY Organic Pesticides for Natural Gardening
Recipes for all-natural and environmentally friendly insecticides. Get rid of ants, aphids, bees, wasps, midges, and more with these easy-to-make (and completely organic) pesticides.
This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.
Limmuel Uy on September 09, 2018:
Where and how to buy your product.lbc is the best for deliver safe. And contact number to contact for my request
Isagani B.Rollo on April 27, 2017:
where and how to buy your product neem oil for gardening?how much 1 gallon?
Sean Hemmer (author) from Wisconsin, USA on February 28, 2013:
Patsybell - Thank you very much! I already ordered a bottle of neem and a few other controls so I'll be ready right when spring hits.
Patsy Bell Hobson from zone 6a, Southeast Missouri, USA on February 28, 2013:
What a helpful and detailed guide to using an organic garden treatment. I'll be ready for garden pests this year. voted useful and up, and pintrest.
Sean Hemmer (author) from Wisconsin, USA on February 14, 2013:
Bazmak - That's a good idea using Coco-Wet! I think I might have to give it a try. I've used neem as a preventative measure against powdery mildew, but I've yet to try it against a full scale infection. I've heard mixed views on post-infection neem application
prasetio30 - Thank you! I'm glad I could help!
prasetio30 from malang-indonesia on February 14, 2013:
Very inspiring hub. I learn something new about the plant above and thanks for share about the recipe as well. Voted up!
Bazmak from Michigan on February 13, 2013:
Never knew it worked on powdery mildew, neat! I like to mix it with some cocowet so it spreads nice and even on my leaves. Should add it to my feeding regiment a little systemic repellant couldn't hurt.
Sean Hemmer (author) from Wisconsin, USA on February 13, 2013:
SaraGardner - Thanks! I never knew it could be used like that. I've heard of it being in skincare products though. I'll definitely keep that info in mind!
travel_man1971 - Thank you much! I've heard of a few neem remedies, but this is the first I've heard of a neem remedy for hangovers. I made a mental note of that for the next time I do a little excessive celebrating!
rebeccamealey - Thanks! I hope so!
kikaystuff - Very true! Thank you much!
kikaystuff from Philippines on February 13, 2013:
anything organic is excellent. thanks
Rebecca Mealey from Northeastern Georgia, USA on February 13, 2013:
It is good to learn about neem oil. Thanks for making lots of people aware. This Hub will do great deeds!
Ireno Alcala from Bicol, Philippines on February 13, 2013:
First-rate info! I also had an experience of boiling neem tree leaves in order to detoxify my tummy due to excessive drinking (that was ages ago). It's so bitter but after that, I felt relieved and rejuvenated.
Sara Gardner from Finland on February 13, 2013:
Thank you for the organic insecticide idea, that's really useful! I use organic neem oil on my horses during the summer to stop them being plagued by insects and it works really well....it also means that I don't get bitten either as I'm always covered in it....and it is really good for the skin.
Sean Hemmer (author) from Wisconsin, USA on February 13, 2013:
Thank you for the comments, everyone! I was not expecting HOTD, so I made some very minor changes and added a picture of some spider mites that I recently had to control using neem oil.
I have had great success with neem oil on my houseplants, especially during winter when the air is dry and the furnace is running which are ideal for spider mites and other tiny pests.
Be forewarned - neem oil has a very earthly aroma which some people many find to be a bit unpleasant.
Stephanie Bradberry from New Jersey on February 13, 2013:
I do plan on using neem oil this spring and summer for pest control. But I learned from one of my herbalism courses that while it does deter pests, for some reason it draws ants. So I will see how true this is when I try it.
Craig Gibson from Traverse City Michigan on February 13, 2013:
RTalloni on February 13, 2013:
Thanks much for this info on using neem oil to make an organic pesticide.
Congrats on your Hub of the Day award, as well!
Seema Misra from Bangalore, India on February 13, 2013:
I usually buy an organic neem oil insecticide. However, the recipe you have provided seems quite simple.
I will try it next time.
Patricia Scott from North Central Florida on February 13, 2013:
Interesting...am only using organic agents to keep the buggies away.
I am not familiar with this one so am glad to have come across it.
Congrats on HOTD...:) and I will be back to read more another day.
Thelma Alberts from Germany on February 13, 2013:
Congratulation on the HOTD award! I have not heard about Neem oil before reading your hub. It´s very interesting and useful as I do have a garden with infected flowers. Thanks for sharing this. Voted up and more;-)
rexy on February 13, 2013:
l researched the web a number of years back... on Neem oil - in India they used this as Insecticide for centuries - good recipe which l shall try out..
Sean Hemmer (author) from Wisconsin, USA on January 31, 2013:
Thank you much, Cat! I try to use neem whenever I can... as long as an infestation/disease is not out of control. Sometimes I have to use chemical applications to save plants against severe attacks. But yes, a little perseverance will prove neem very useful!
Catherine Tally from Los Angeles on January 31, 2013:
Thank for thissxcellent hub on the benefits of neem oil which should be in every gardener's cupboard! Its ability to interupt the lifecycle of pests makes it very effective. I hope your info here helps get the word out that just because the result isn't instantly gratifying doesn't mean it doesn't work. Voted UP and useful.