biopreparados.es

Neem leaf brew

Neem leaf brew

Plant vitality Bio-input
commercialized
Maceration Plant-based

Maceration

Cold extraction by prolonged soaking of the plant material in a liquid (water, oil or alcohol depending on use), without heat. The longer contact time than an infusion extracts compounds that cold water alone would dissolve too slowly.

Process summary

1) Chop or crush the plant material. 2) Fully submerge it in the chosen liquid, in a closed container. 3) Let it sit in a cool, dark place, stirring occasionally, for anywhere from several hours to several days depending on the preparation. 4) Strain and use the resulting liquid.

See all preparation methods

✅ Authorised (some countries)

A traditional preparation made from neem leaves steeped in water, cited in agroecological literature as a smallholder farming practice and applied by spraying onto foliage.

Application

When to use: Routinely and occasionally

Opportunist: Powdery mildew (Fungus) San José scale (Insect — Hemiptera) Confirmed pest Aphid (Insect — Hemiptera) Whitefly (Insect — Hemiptera) Spider mite (Insect — Mites) Thrips (Insect — Thrips (Thysanoptera)) Rust (Fungus)

Warning: the associations between recipes and opportunists come from other references (traditional practices, publications, user feedback). They are neither a recommendation nor a claim of effectiveness. There is no certainty regarding the preparation, application and use of these bio-preparations. See the regulations

Application description: Apply with a sprayer to the foliage in the late afternoon. Apply for 7 consecutive days, then wait 3 weeks before repeating.

Dose: Dilute 1 part of the macerate in 3 parts of water before applying.

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Regulatory status

✅ Authorised in Burundi, in Colombia, in Costa Rica, in India, in Kenya, in South Korea, in Peru, in the Philippines, in Rwanda, in Tanzania and in Uganda

Authorised bio-preparations: Burundi
Authorised bio-preparations: Colombia
Authorised bio-preparations: Costa Rica
Authorised bio-preparations: India
Authorised bio-preparations: Kenya
Authorised bio-preparations: South Korea
Authorised bio-preparations: Peru
Authorised bio-preparations: Philippines
Authorised bio-preparations: Rwanda
Authorised bio-preparations: Tanzania
Authorised bio-preparations: Uganda

In the EU, only azadirachtin (neem seed extract) is approved as an active ingredient for use in authorized commercial plant protection products. Neem leaves are not an approved active ingredient, so homemade neem spray for foliar application is not authorized. Its ingredients also appear on the official lists of inputs permitted in organic farming of: Burundi, Colombia, Costa Rica, India, Kenya, South Korea, Peru, Philippines, Rwanda, Tanzania, Uganda. Depending on the country, some are only allowed under conditions (certification body approval, maximum doses): see each country's page.

Official texts

Official sources automatically checked on 20/10/2026.

What the icons mean: ✅ Authorised ⚠️ Tolerated 🟠 Not prohibited ⛔ Not authorised EU 🔎 Status being verified Full details →

Documentary information, checked on 19/10/2026. Not a substitute for legal advice; regulations may vary from country to country. See the regulations · Substances authorised in Europe

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