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Common names: Onion, Shallot
Scientific name: Allium sepa
Family: Alliaceae

picture discription
Photo by Jewel Kinilitan-Bissdorf

Plant parts used


Mode of action

Insecticidal and repellent


Materials Methods of preparation How to use  Plant pests 
Onion bulb extract 1
(Vijayalakshmi, et.al.,
1999: pp. 30-32)

85 grams of chopped
50 ml of mineral oil
10 ml of soap
450 ml of water
Bottle container

Add chopped onion to kerosene.
Allow this mixture to stand
for 24 hours.
Add water and stir-in the soap.
Store in bottle container.

Dilute 1 part of the emulsion
with 19 parts of water
(for example, 50 ml of
emulsion to 950 ml of water).
Shake well before spraying.
Spray thoroughly on the infested
plant, preferably early in the

Onion bulb extract 2
(Stoll, 2000: p. 172)

1 kg of bulb onions
1 liter of water
Cooking pot

In a pot, bring 1 liter
of water to boil.
Chop the onions, then place
in a covered container.
Pour the boiling water into
the container.
Let it stand for 24 hours.

Dilute the 1 liter extract
with 10 liters of water.
Spray thoroughly on the infested
plant, preferably early in the
morning or late afternoon.

Spider mites
Onion bulb extract 3
(Stoll, 2000: p. 223)

50 g of bulb onion
1 liter distilled water

Finely chop the onion.
Add to water.
Mix well.

Spray thoroughly on the infested
plant, preferably early in the
morning or late afternoon.

Fusarium wilt
Fungal leaf blight

Standard procedures for the preparation and application of the plant extracts

  1. Select plant parts that are free from diseases.
  2. When storing the plant parts for future usage, make sure that they are properly dried and are stored in an airy container (never use plastic container), away from direct sunlight and moisture. Make sure that they are free from molds before using them.
  3. Use utensils for the extract preparation that are not use for your food preparation and for drinking and cooking water containers. Clean properly all the utensils every time after using them.
  4. Do not have a direct contact with the crude extract while in the process of the preparation and during the application.
  5. Make sure that you place the plant extract out of reach of children and house pets while leaving it overnight.
  6. Harvest all the mature and ripe fruits before plant extract application.
  7. Always test the plant extract formulation on a few infested plants first before going into large scale spraying. When adding soap as an emulsifier, use a potash-based one.
  8. Wear protective clothing while applying the extract.
  9. Wash your hands after handling the plant extract.

Effect on humans

None known during the write-up, however take extra caution as extract maybe harmful to people with sensitive skin.

Effect on non-target organisms



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