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Making Natural Pesticides

Making Your Own Natural Pesticides

These natural pest deterrents and natural pesticides can be applied with a sprayer or watering can or by dipping leafy twigs into the solution and sprinkling it onto the plants. Use a stick to apply the solution to the underside of leaves. Don’t leave pesticides outside or sitting around where they could be mistakenly consumed by animals or humans. All food treated with natural pesticides should be washed in clean water before being sold or eaten.

Chilies or Hot Peppers

Boil a bowlful (half a kg of sliced ripe chili peppers) in 3 litres of water for 15 to 20 minutes. Alternatively boil 5-6 Scotch Bonnet peppers in a medium saucepan for 15 to 20 minutes. Add 30 grams of soap and stir to make solution soapy (so it will adhere to the plants). Add 3 more litres of water, let cool and strain. Instead of boiling peppers can be put in a bucket of water and left to draw for 4 to 5 days. Add soap and proceed as above.


Use on vegetable gardens against caterpillars, aphids, flies, ants and other pests. Apply once a week if there is no rain, 2-3 times a week if it rains.


Grind fresh leaves, dilute with water and strain. Let draw in container for 4-5 days.


Particularly effective on caterpillars and weevils. Spray daily for 2 weeks to interrupt caterpillar reproduction cycle.


Dry ½ to 1 Kg of young flowers until they are crumbly. Boil in 4 litres of water for 15 to 20 minutes. Add soap and stir. Add 4 litres of water. Strain before using in a sprayer. Store extra dried flowers or pesticide solution in a dry place away from direct sunlight. Use liquid as soon as it cools. Apply in the same way as the pepper spray. Best results if applied after sundown.


Use on vegetable gardens against caterpillars, aphids, flies, ants and other pests. Apply once a week if there is no rain, 2-3 times a week if it rains. Powder of cut flowers can be sprinkled around the house to kill pleas and on beds to kill bed bugs.


Mexican Marigolds

Place large quantities of freshly gathered flowers, leaves and stalks in a bucket of water. Let stand for 5 to 7 days to decay. Stir often so material decays evenly. When decayed, dilute with equal amount of water and add soap.


Acts as crop strengthener to help potatoes, beans, tomatoes and peas resist blight, mildew and other fungal diseases. Begin spraying before diseases start: continue regularly once a week. Effective if weather is not too damp. Also repels aphids, caterpillars and flies. Decayed flowers. Leaves and stalks can also be used as mulch


Wood Ash

Use fresh (but not hot) ash from cooking fires. Any sort of wood will do, although ash from eucalyptus or Cyprus trees is most effective. Sprinkle handfuls of ash around seedlings as soon as they sprout to repel cut worms. Replace after every rain. Need only apply for the first 2-3 weeks (until plants are too big for worms to cut).


Also effective against root maggots, snails and slugs. Surrounding entire plot with 8 to 10 centimetre trench with ash has the same effect.



Boil double handful of dry leaves (200 grams) with some ground leaves (snuff) or cigarette ends in 3 to 4 litres of water for 15 to 20 minutes. Add 30 grams of soap and stir while letting solution cool. Add 3 to 4 more litres of water. Filter through light cloth.


Spray on plants to kill stem borers and on plants infested with caterpillars, aphids, flies, mites or scale insects. Brush on hides of sheep, cattle or goats infested with ticks. Apply once a week. After 2 to 3 washings, ticks will disappear. Soak bedding with solution to kill bed bugs and fleas.

*Crops sprayed with it should not be harvested for at least 4 days after spraying and should be washed thoroughly with clear water before eating*


Recipes for Natural Pesticides/Deterrents


Pepper Combination all Purpose Sprays

1. Blend 3 hot peppers, 2 onions and a bulb of garlic in 1 litre of water. Boil, let stand for 2 days. Strain. This may be frozen for future use.

2. 6 cloves of garlic, 1 tbsp dried hot pepper, 1 minced onion, 1 tsp pure soap (not detergent) and 1 gallon of hot water.

Blend and let sit for 1-2 days. Strain and use and spray. Ground cayenne or red hot pepper can also be sprinkled on the leaves of plants (apply when leaves are slightly damp) to repel chewing insects. Protects plants from cabbage worms, caterpillars, hornworms, aphids, flea beetles and other chewing sucking insects.


Onion Spray

Blend one unpeeled opinion with 1 litre of water until it is milky colour. Strain. Helpful with aphids and red spider mites.


Garlic Spray

Soak 4 garlic cloves in 1 L of cold water for 3 days. Blend and strain. Helpful with ants, caterpillars and cabbage worms.


Neem Spray

Crush 500 grams of neem seeds. Mix the crushed seeds with 10 L of water and leave to stand for at least 5 hours (preferably overnight). Strain this through heavy cloth or gauze and it is ready for spraying.

Chive Tea

Pour 600 ml of boiling water over ¼ cup of dried chives. Leave to infuse for one hour. Strain. Dilute 1 part spray to 2 parts water. Helpful for scale and mildew.

Salt Spray

Mix 125g salt with 9 litre of water and 30 grams of soft soap. Helpful in controlling white cabbage butterfly.

*When using any pest control apply before sunrise and after sunset so that foraging bees are not affected. Use several times a day if the pest problem is chronic and after rain*

*Homemade sprays should be stored in a glass bottle in a dark place away from children. Most of these sprays may be stored for up to a month. The pulp left after straining the mixtures can be dug into the garden or put in your compost heap*








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