The oil is also used an an organic pesticide
Definition as written by Magpye:
A botanical insecticide that is nontoxic. It is derived from the neem tree (azaderachta indica).
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Neem
Neem is derived from a tree in India and is used to kill moths, caterpillars, thrips, leaf miners and other insect pests in the garden.
Neem
Ingredients: Contains 2 ingredients, azadirachtin (AZA0 and liminoids, both frm the seed kernels of the neem tree fruit.
Application: Sprayed onto plant leaves.
Neem Oil-oil from the Neem Tree that is effective in houseplant pest management and leaf polishing.
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Neem
The newest of the botanical insecticides are those derived from seeds of the neem tree, Azadirachta indica.
NEEM - A botanical insecticide that is nontoxic. It is derived from the neem tree (azaderachta indica).
Plant A Neem Tree. It fixes nitrogen in the soil, its leaves make excellent mulch that help control nematodes and the seeds can be pressed into bug-repellant oil.
4. Whole neem oil is a promising new product for controling black spot, powdery mildew, and rust as well as many insects and mites. (Neem oil comes from the tropical neem tree, Azadirachta indica.) ...
Neem oil comes from the seeds of the neem tree ( Azadirachta indica ) and is used as both an insecticide and a fungicide.
Neem oil is an example of a foliar spray that has other properties that includes the promotion of plant growth, but these properties cannot be promoted.
Neem oil is a safe and effective treatment for the majority of pest problems.
Bon-Neem, an insecticidal soap that contains neem, an oil derived from the neem tree.
Serenade Garden Disease Control is a spray that contains beneficial bacteria.
Garden Dust, an insecticide-pesticide that contains copper.
Need neem oil? Neem oil - made from guess what? - neem seeds, prevents fungus growth, and repels and kills insects, including mites. While it fights many scourges, it's nontoxic to birds, mammals and most beneficial insects.
To use Neem oil -mix 1 ounce (2tBsp) of Neem oil and 1 1/2 tsp. of diswashing detergent to 1 gal. of water. It works on the crawler stage, smothers the eggs and regulates insect growth. Several applications every 5 days may be required.
Neem controls insects and also repels them. Castor oil mixes can be used to repel moles. For years, gardeners have used garlic, hot peppers and similar herbal mixtures to repel pests.
To battle the insects, diseases, and mites that attack your edible crops, try neem oil.
In addition, a botanical pesticide derived from the bark of the neem tree, azadirachtin, controls a number of common insects and suppresses some diseases, as does pyre thrum, which is derived from natural plant toxins, and its synthetic equivalent, ...
Paul recommends Bt for caterpillars; Neem for cucumber and Colorado potato beetles; horticultural oil or insecticidal soap for scale, mites and aphids.
There are organic ways to combat pests and diseases: Pyola and neem oil are insecticide options. Both of these only affect insects that feed directly on plants, so the beneficial insects that feed on the predatory ones aren't affected.
Insecticidal soaps and neem oil extracts are also excellent for removing unwanted pests but use caution when using neem oil sprays. These sprays will affect beneficial insects as well as harmful ones so they shouldn't be sprayed all over.
Neem based fungicides (such as Greenlight Powdery Mildew Killer) and horticultural oils act as eradicants. Do not apply oils to drought stressed plants or within two weeks of a sulfur spray. Do not apply oils when temperatures are above 90 degrees F.
As a last resort for stubborn infestations, try applying a minimal amount of botanical pesticides like Neem oil, rotenone or pyrethrin, according to package directions.
There are products on the market that are considered organic, such as orange oil and neem oil. Even though they are labeled organic, they may still be toxic. After all, they are made to kill something.
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Many companies have even switched from producing synthetic pesticides to copying nature by synthesizing naturally occurring compounds in a laboratory setting. Extracts of willow, cinnamon, grapefruit, garlic, neem, bittersweet, lemon grass, derris, ...
In the few cases where bad-guys attack organically raised plants, they are sturdy enough to need little in the way of help; I managed last year with neem oil and a few products from the fridge and pantry; more on that later.
Blast away adult whitefly with a hose and wipe infected leaves with a soapy rag at night. If the population is large use Pyrethrum spray or Neem oil on the underside of the leaves to control numbers and break the breeding cycle.
Control only if plants are showing signs of stress or damage. Sticky traps can be used, but cover traps to keep birds off while allowing insects in. Neem, horticultural oils and other insecticides also can be used.
 See also: Plant, Insect, Water, Gardener, Organic
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