Is Neem oil the same as horticultural oil?

Asked By: Saliou Reixach | Last Updated: 11th February, 2020
Category: hobbies and interests beekeeping
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Horticultural oils, sometimes called dormant oil or even dormant spray, have a very specific viscosity or thickness that makes them effective in killing pests. One major difference between neem oil and horticultural oil is the toxicity of neem oil toward some insects. Horticultural oil is not toxic on its own.

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Then, is Neem oil the same as mineral oil?

Mineral oil is more likely to burn plants during the growing season, and is better for dormant protection, whereas neem is a little easier on plants (so you can use a little more), and is also more antifungal.

Similarly, is horticultural oil the same as white oil? So in hot weather the newer oil won't damage your plants. The other difference is that the modern horticultural oils are based on petroleum and are expensive to buy. White oil is cheap and better still, you can make it yourself.

Moreover, what is horticultural oil used for?

Horticultural oils or narrow range oils are lightweight oils, either petroleum or vegetable based. They are used in both horticulture and agriculture, where they are applied as a dilute spray on plant surfaces to control insects and mites. They are also sometimes included in tank mixes as a surfactant.

What bugs does neem oil kill?

Insects: Neem oil kills or repels many harmful insects and mites, including aphids, whiteflies, snails, nematodes, mealybugs, cabbage worms, gnats, moths, cockroaches, flies, termites, mosquitoes, and scale. It kills some bugs outright, attacks the larvae of others, and repels plant munchers with its bitter taste.

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When Should I spray my horticultural oil?

The recommended practice is to spray trees in spring, just before flower buds open. Do this during a period of mild weather when temperatures are expected to stay above 40 degrees Fahrenheit. Never apply horticultural oil in very warm weather (above 80 degrees) because heat increases risk of leaf injury.

Is Dormant oil dangerous?

The majority of pest control oils are some type of mineral oil, a refined petroleum product. This "dormant oil" killed off over-wintering insects such as aphids, mites, and scale. The first dormant oils were heavy and you couldn't safely use them on actively growing plants or you could damage the foliage.

Is Neem oil harmful to honey bees?

Neem oil is practically non-toxic to birds, mammals, bees and plants. Neem oil is slightly toxic to fish and other aquatic organisms. It is important to remember that insects must eat the treated plant to be killed. Therefore, bees and other pollinators are not likely to be harmed.

How do you make horticultural oil?

Homemade Horticultural Oil
  1. Mix one tablespoon of liquid soap with one cup of cottonseed oil. You can also use safflower oil, soybean oil or vegetable oil as an alternative to cottonseed oil.
  2. Mix 1½ tablespoons of your oil mixture for every one cup of water.
  3. Shake mixture well and apply to infected plants.

What plants are sensitive to neem oil?


Do a test application before you use neem oil spray on plants that are known to be sensitive to oils: impatiens, fuchsias, hibiscus and some roses, trees like maples, hickories or black walnut.

Can I use neem oil on fruit trees?

Neem oil can protect your fruit trees and berry bushes.
To keep your fruit trees and berry bushes insect free, spray your plants and trees early — before blossoming, then again when the petals drop, and every two weeks after to control these pests.

How can I use neem oil on my face?

How to use neem oil on your skin
  1. Lightly dab the neem oil onto the area using a cotton swab or cotton ball, and allow it to soak in for up to 20 minutes.
  2. Wash off the oil with warm water.
  3. Use daily until you achieve desired results.

Can neem oil be used as dormant oil?

Since neem oil can kill insects at varying stages, you can use it as a dormant-season application to kill overwinter pests and eggs or as a foliar spray to repel and kill insects. Use neem oil as a dormant oil spray to control a number of insects, including: Scale insects.

How often can you use horticultural oil?

Horticultural Oil is usually best sprayed from Feb 15 into March or as long as the plant is still dormant. Labels advise 1 or 2 applications, depending on the population. One application with complete coverage might be sufficient as a preventative.

How long does neem oil take to work?


Neem Oil Uses in the Garden
The oil has a half life of three to 22 days in soil, but only 45 minutes to four days in water. It is nearly non-toxic to birds, fish, bees and wildlife, and studies have shown no cancer or other disease-causing results from its use. This makes neem oil very safe to use if applied properly.

Does horticultural oil kill fungus?

Horticultural oils can also be used against powdery mildew whose fungal strands or hyphae grow on the surface of plant leaves on susceptible plants. Horticultural oils are not selective so will kill any susceptible beneficial insects, as well as pests, that are coated by the oil.

How often can you spray neem oil?

When applied as a preventative, neem oil should be applied on a 7- to 14-day schedule according to the manufacturers of 70% neem Oil. To control a pest or disease already present, they recommend an application on a 7-day schedule.

Can neem oil burn plants?

Neem oil might kill some plants, especially if they are young and if the oil is applied too heavily. Test a small area of the plant and wait 24 hours before applying it all over. Apply neem in the evening for outdoor plants and out of direct sunlight for indoor plants to prevent leaf burning.

How do you mix neem oil for roses?

Mix 1 tsp of neem oil and 1/2 tsp of liquid dish soap to 1 quart of water, or 4 tsp of neem oil and 2 tsp of liquid dish soap to 1 gallon of water. Shake well. (Neem oil mixes easier with warm water.) Spray the diluted solution generously on all leaf surfaces.

Is Neem oil safe on vegetables?


It is safe to use on both ornamental and edible crops and can be sprayed on herbs and vegetables up to the day of harvest. Applying neem oil to a drought-stressed plant can burn the foliage, so water plants thoroughly before using it.

Will horticultural oil kill ladybugs?

Ahem. But both components of Pyola—the oil and the Pyrethrin—have the same capacity to harm wonderful ladybug larvae as they do (non-wonderful) aphids. Same with a spray of horticultural oil alone; even without the Pyrethrin, it would smother good and bad creatures alike.

What is a good insecticidal soap?

Fill a 1-gallon jug with water—either distilled or tap, as long as yours is not hard water (hard water reduces the effectiveness of insecticidal soap)—and leave a couple of inches at the top. Then add 2-½ tablespoons liquid dish soap (Dawn or liquid castile soap are good choices) and 2-½ tablespoons vegetable oil.