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The best form of natural pest control is growing healthy plants so that they can defend themselves against insects and disease. To start, give your plants nutritious
soil, sufficient space, moisture and sunshine.
Patrol your plants regularly to pick off pests. Check your vegetables. Look on the underside of leaves, and thoroughly scour beans, peas and carrots. Dig you finger into the soil around your vegetables (without damaging the root structure) to gauge moisture content.
Beneficial insects such as ladybugs, wasps, lacewings and dragonflies should be encouraged. All ‘pests’ are food for their predators. By killing them off you're reducing the chances that predators will build up enough to do the job of ‘pest control’ for you. Therefore, use pest control sparingly.
Organic, natural pest control can be done easily and cleverly, and can be very efficient and effective. Following are several sample pest control recipes for organic gardeners.
Problem:
Brown rot, curly leaf, black spot, mildew
Pest Control:
Bordeaux Mixture
Bordeaux is a standard organic fungicide. It can be used when plants are dormant, generally during the winter months. It can be used on all citrus or cool days, when there are no blossoms on the trees. Bordeaux is effective for brown rot, curly leaf, black spot and other bacterial, fungal and mildew problems. Spray grapevines when the shoots are less than 100cm long, for black spot and powdery mildew.
Bordeaux will begin to separate after an hour, so use immediately.
- Mix 90 grams of blue copper sulphate with 1 gallon of cold water, in a non-metallic container.
- In a second non-metallic container, mix 125 grams of slaked lime in 1 gallon of cold water. Mix together and stir well.
- Test the mixture using an old nail. Dip the nail into the mixture 30 seconds. If the nail comes out blue, you need to add more lime. Do not use the mixture until the problem is corrected, otherwise you may burn your plants.
- The mixture can be used with any spray equipment. Keep some fresh, clean water on hand to wash out nozzles to keep them clear of clogging.
- Spray in early winter.
Problem: Fruit Sucking Beetles
Pest Control:
Blue Spray
- Collect as many of your pest insects, bugs and beetles and put them in a container.
- Transfer them to a blender. Add water, and blend well.
- Transfer to a spray bottle.
- Spray mixture on all the plants that you do not want the bugs, insects and beetles.
Problem: Black spot, scab, mildew, brown rot, rust
Pest Control:
Chamomile Tea Spray
Chamomile tea can be used as a very mild fungicide. Use it for early mildews and fungal problems, and for brown rot on fruit.
- Cover a handful of flowers in boiling water. Allow to cool then transfer to a clean spray bottle.
Problem:
Rust, brown rot
Pest Control:
Chive Spray
- Place a handful of fresh chives in a container. Cover with water and allow to steep.
- When cool, strain off water, then place in a spray bottle.
- Spray on all plants affected by rust.
Problem:
Rust, brown rot, black spot
Pest Control:
Comfrey Spray
- Take a handful of Comfrey and cover with fresh water for at least 3 weeks.
- Strain and place in a spray bottle.
Problem: Cherry slug, pear slug
Pest Control:
Dehydrated Flour
- Dust small cherry and pear trees with dehydrated flour, as this will act as a stomach poison to pear and cherry slugs.
Problem: White butterflies
Pest Control:
Eggshells
- As a decoy for white butterflies, place eggshells under and around cabbage or other plants.
- Broken eggshells can also be used as a deterrent for snails and slugs. Place the crushed eggshells around any plants you wish to keep snails and slugs away from. The slugs/snails find it difficult to cross the broken eggshells.
Problem: Aphids, white fly, harlequin bugs, mites, whooly aphids
Pest Control:
Glue Spray
- Mix 1 cup white flour with 1 cup boiling water. Mix in cold water. Stir for several minutes, until thick.
- Place into a spray bottle. Spray the top and bottom of leaves, ensuring that the entire surface is covered.
- Either wait for the glue to peel off, or wash off in rain naturally, or hose the plant down after 24 hours.
Problem: Black spot, mildew, brown rot, mites, apple and pear scab, mold, fungi
Pest Control:
Milk Spray
- In hot weather dilute 1 cup full cream milk with 9 cups water. This is to ensure that young foliage and flower buds don’t burn. Spray directly onto affected plants.
Problem: Brown rot, mildew, scab, black spot
Pest Control:
Milk and Bicarbonate of Soda
- Make up ‘Milk Spray’ as above, adding 1 teaspoon Bicarbonate of Soda. Transfer to a spray bottle.
Problem: Brown rot
Pest Control:
Nettle Spray
- Take a handful of Nettle and cover with fresh water for 3 weeks. Strain and bottle.
Problem: Aphids
Pest Control:
Oil Spray
- Mix 1 gallon of soap with 1 pint of oil.
- Boil and stir vigorously until totally dissolved.
- Dilute this with 20 times the volume of water.
- This spray will separate quickly, so cannot be stored. Use immediately.
- Cover the insects and/or their eggs with a light film of oil, which will suffocate them.
- Do not use this oil spray when the temperature exceeds 80 degrees (F). Otherwise the oil may burn your leaves.
Problem: Bugs
Pest Control:
Pyrethrum
Pyrethrum is a broad spectrum spray made from pulverized pyrethrum flowers. Pyrethrum kills bugs, but has low toxicity for animals and humans. Pyrethrum also kills bees, so limit use to evenings.
- Place 1 tablespoon Pyrethrum powder or 2 tablespoon
s flowers in a jar.
- Cover flowers with oil and leave to steep overnight.
- Strain, then add 1 gallon of water and mix well. Use immediately.
Problem: Powdery mildew, brown rot
Pest Control:
Seaweed Spray
Seaweed strengthens a plant’s resistance to a range of infections as well as makes them resistant to frost. It can be also be used as a preventative measure against brown rot. Seaweed is also said to help fruit set.
- Wash salt from seaweed and cover with fresh water for 3 weeks.
- Strain off as much water as required, then dilute it until it is the color of very weak tea.
- Place in a spray bottle and use when required.
Problem:
Snails and slugs
Pest Control:
Snail Soup
- To repulse snails and slugs, collect as many as you can, then place in a container and cover with water.
- Put a lid on the container and put aside for several days, allowing the snails and slugs to ferment.
- Strain, then spray where you don’t want slugs and snails to invade.
Problem: Apple and pear scab, mildew
Pest Control:
Urine
Human
urine is sterile although it does not remain sterile when stored. Therefore, it must be used immediately.
- Spray the full strength urine on dormant trees, at least twice in winter. Use it diluted with ten parts water on summer mildew problems.
- Spray apple and pear trees for scab with diluted urine when ¾ of the blossoms have fallen.
Problem: Possums
Pest Control:
Wasabi
- Add 6 parts water to 1 part Wasabi.
- Place in a spray bottle.
- Spray thickly, drenching the plant and/or area.
Problem: Aphids, bugs
Pest Control:
White Pepper
- Thickly sprinkle white pepper onto plants to repel bugs and aphids.
- Sprinkle again after rain or watering.
- An alternative is to mix the pepper well with soapy water to create a spray.