Natural Bug Sprays
Caution, please: not all house and garden insects are enemies to the propagation of healthy plants. Ladybugs, praying mantis, lacewings, spiders, and horse hair snakes are among the many winged or crawling "friends" in the garden who eat harmful insects. Please check before you spray.
The idea of using rubbing alcohol as a spray for plants pests has been around for years. Can cause leaf damage on African Violets, and Apple trees.
- Protection offered: Alcohol sprays work on aphids, mealybugs, scale insects, thrips and whiteflies. Alcohol sprays have been used successfully on houseplants and tropical foliage plants. Most of these have heavy, waxy cuticles that are not easily burned.
- How to Make: Use only 70% isopropyl alcohol(rubbing alcohol): mix 1 to 2 cups alcohol per quart of water. Using undiluted alcohol as a spray is very risky for plants. You can also mix up an insecticidal soap spray according to the dilution on the label but substitute alcohol for half of the water required.
- How to Use: Since alcohol can damage plants always test your spray mix on a few leaves or plants first. Tests results should show up within 2 or 3 days.
Nightshade family plants, such as tomatoes, potatoes and tobacco, have toxic compounds called alkaloids in their leaves. These toxins are water soluble and can be soaked from chopped leaves and made into home-made sprays. These sprays also work by attracting natural pest enemies. The good bugs follow the smell of the spray in looking for prey.
- Protection Offered: Tomato leaf sprays have been used to protect plants from aphids. Also, spraying tomato leaf spray on corn may reduce corn earworm damage. The corn earworm is also called the tomato fruitworm, as it also attacks tomato plants. A scientific study has shown that corn plants sprayed with tomato leaf spray attracted significantly more Trichogramma wasps to parasitize the corn earworm eggs than the unsprayed did.
- How to Make: Soak 1 to 2 cups of chopped or mashed tomatoe leaves in 2 cups of water overnight. Strain through cheescloth or fine mesh, add about 2 more cups of water to the strained liquid, and spray. For aphid control, be sure to thoroughly cover the leaf undersides, especially of lower leaves and growing tips of plants where aphids congregate.
- How to Use: Spray plants thoroughly, particularly undersides of lower leaves and growing tips where aphids congregate. while this spray is not poisonous to humans on contact, use care in handling, especially if you are allergic to the nightshade family.
Garlic Oil Sprays:
Organic gardeners have long been familiar with the repellent or toxic affect of garlic oil on pests. when it is combined with mineral oil and pure soap,as it is in the recipe that follows, devised at the Henry Doubleday Research Association in England, it becomes an effective insecticide. Some studies also suggest that a garlic oil spray has fungicidal properties.
- Protection Offered: Good results, with quick kill, have been noted against aphids, cabbage loopers, earwigs, June bugs, leafhoppers, sqaush bugs and whiteflies. The spray does not appear to harm adult lady beetles, and some gardeners have found that it doesn't work against the Colorado potato beetles, grape leaf skeletonizers, grasshoppers, red ants, or sowbugs.
- How to Make: Soak 3 ounces of finely minced garlic cloves in 2 teaspoons of mineral oil for at least 24 hours. Slowly add 1 pint of water that has 1/4 ounce liquid soap or commercial insecticide soap mixed into it. Stir thoroughly and strain into a glass jar for storage. use at a rate of 1 to 2 Tablespoons of mixture to a pint of water. If this is effective, try a more dilute solution in order to use as little as possible.
- How to Use: Spray plants carefully to ensure thorough coverage. To check for possible leaf damage to sensitive ornamentals from the oil and soap in the spray, do a test spray on a few leaces or plants first. If no leaf damage occurs in 2 or 3 days, go ahead and spray more.
Many organic farmers are familiar with using sprays made from aromatic herbs to repel pests from the garden plants. Several recent studies confirm the repellent effect of such sprays. The essential oil of Sage and Thyme and the alcohol extracts such as Hyssop, Rosemary, Sage, Thyme, and White Clover can be used in this manner. They have been shown to reduce the number of eggs laid and the amount of feeding damage to cabbage by caterpillars of Diamond back moths and large white butterflies. Sprays made from Tansy have demonstrated a repellent effect on imported cabbageworm on cabbage, reducing the number of eggs laid on the plants. Teas made from Wormwood or Nasturtiums are reputed to repel aphids from fruit trees, and sprays made from ground or blended Catnip, Chives, Feverfew, Marigolds, or Rue have also been used by gardeners against pests that feed on leaves.
- Protection Offered: Try herbal sprays against any leaf-eating pests and make note of what works for future reference.
- How to Make: In General, herbal sprays are made by mashing or blending 1 to 2 cups of fresh leaves with 2 to 4 cups of water and leaving them to soak overnight. Oor you can make a herbal tea by pouring the same amount of boiling water over 2 to 4 cups fresh or 1 to 2 cups dry leaves and leaving them to steep until cool. Strain the water through a cheesecloth before spraying and dilute further with 2 to 4 cups water. Add a very small amount of nondetergent liquid soap (1/4 teaspoon in 1 to 2 quarts of water) to help spray stick to leaves and spread better. You can also buy commercial essential herbal oils and dilute with water to make a spray. Experiment with proportions, starting with a few drops of oil per cup of water.
- How to Use: Spray plants thoroughly, especially undersides of leaves, and repeat at weekly intervals if neccessary.
Black pepper, chili pepper, dill, ginger, paprika, and red pepper all contain capsaicin, a compound shown to repel insects. Synthetic capsaicin is also available for feild use. Researchers have found that as little as 1/25 ounce of capsaicin sprinkled around an onion plant reduced the number of onion maggot eggs laid around the plant by 75%, compared to a control plant.
- Protection Offered: Capsaicin-containing dusts repel onion maggots from seedlings, as well as other root maggot flies from cabbage family plants and carrots. Pepper dusts around the base of the plants help repel ants, which is desirable in a garden where ants often protect and maintain aphid colonies on plants.
- How To Make: It can be rather expensive to buy enough packaged pepper dusts to sprinkle throughout your garden. However, if you grow and dry your own red peppers, chili peppers, or dill, you can make lots of dust at low cost. Use a mortar and pestle to grind the peppers, or dill, including the seeds, to dust. Be careful handling the hot peppers because they irritate sensitive skin.
- How to Use: Sprinkle along seeded rows of onions, cabbage, or carrots, in a band at least 6 inches wider than the row or planting bed. A fine sprinkling will suffice, but the more dust you use, the better the effect. Renew after a heavy rain or irragation. To protect plants from ants, sprinkle around the base of plants in an area as wide as the widest leaves.
The dried, powdered flowers of the pyrethrum daisy, Tanacetum cinerarifolium, were used as early as 1880 to control mosquitoes. The popularity of pyrethrum insecticides waned when synthetic insecticides were introduced, but they are now enjoying a commercial comeback.
Many new products formulated with natural pyrethrums are available. Pyrethrins are the insecticidal chemicals extracted from the pyrethrum daisy. Do not confuse them with pyrethroids, the term for a new class of synthetic pesticides.
Pyrethrums, which are mainly concentrated in the seeds of the flower head, are a contact insecticide, meaning the insect only has to touch the substance to be affected. Pyrthrins have a quick knockdown effect on insects: Flying insects are paralyzed. Pyrethrins can be applied up to one day before harvest because they are quickly destroyed by light and heat and are not persistent in the environment. Pyrthrins will kill lady beetes but do not appear to be harmful to bees. They are toxic to fish and to the aqautic insects and other small animals that fish eat but do not seem to be toxic to birds or mammals.
- Protection Offered: Pyrethrins are registered for flowers, fruits, and vegetables, including greenhouse crops. they are effective on many chewing and sucking insects, including most aphids, cabbage loopers, celery leaftiers, codling moth, Colarado potaotoe beetles, leafhoppers, Mexican bean beetles, spider mites, stink bugs, several species of thrips, tomato pinworms, and whiteflies. they are especially good against flies, gnats, mosquitoes, and stored products pests. Flea beetles are not affected, nor are imported cabbageworms, diamondback moths, pear psylla, and tarnished plant bugs.
- How to Make: If you grow your own pyrethrum daisies, you'll have the main ingredient for a make-it-yourself spray. The concentration of pyrethrums is at its peak when the flowers are in full bloom, from the time the first row of florets open on the central disk opens too the time all the florets are open. pick flowers in full bloom and hang them in a sheltered, dark spot to dry. Once the flowers have dried thoroughly, grind them to afine powder, using a mortar and pestle, old blender or small hammer mill. Mix with water and add a few drops of liquid soap. Store in a glass jar and keep the lid tightly closed, because the mixture looses activity if left open. You'll have to experiment with the amount of water to add, because the concentration of pyrethins in the flowers is an unknown variable. If the spray you make does not seem to kill insects, use less water the next time you make the concentrated spray. Also keep in mind whole flower heads stay potent longer so do not grind until ready to use.
- How to Use: Pyrethrins are more effective at lower temperatures, so for best results, apply in early evening when temperatures are lower. Spray both the upper and lower surfaces of the leaves, because spray must directly contact the insects such as thrips that hide in leaf sheaths and crevices. The first spray will excite them and bring them out of hiding, the second will kill them. Never use pyrethrin products around waterways and ponds.
One of the top three insecticides in the 1880s, nicotine in several forms is still widely used. Nicotine comes from the tobacco plant and is extremely toxic to insects. The great advantage of home-made nicotine tea is that it is very short ived, retaining its toxicity for only a few hours after spraying. It is relatively nonhazardous to bees and lady beetles because of its short persistence.
- Protection Offered: Nicotine is effective against ground and soil pests, especially root aphids and fungus gnats, and on many leaf-chewing insects, such as aphids, immature scales, leafhoppers, thrips, leafminers, pear psylla, and asparagus beetle larvae.
- How To Make: You can brew your own batch of nicotine tea by soaking tobacco leaves or cigarette butts in water to make a spray. Soak 1 cup of dried, crushed tobacco leaves, or an equivalent amount of cigarette butts, in one gallon of warm water with 1/4 teaspoon pure soap added. Strain the mixture through cheesecloth after it has soaked for 1/2 hour. The solution will keep for several weeks if stored in a tightly closed container.
- How to Use: For soil pests, pour the spray mixture onto the soil in the area of the stem base and root zone. for leaf pests, spray leaves thoroughly, especially the undersides. Nicotine can be absorbed by plant leaves and remain there for several weeks. to be safe, use nicotine only on young plants and only up to one month before harvest. It's probably safest not to spray nicotine on eggplant, peppers or tomatoes. While most tobacco cultivars now grown are resistant to tobacco mosaic virus, nicotine sprays could contain the pathogen, which will infect nightshade family crops.
Tobacco teas are sometimes prepared by home gardeners to control garden pests, and while not as toxic as nicotine sulfate sprays, any nicotine solution toxic enough to kill insects can also be harmful to humans”.
Information by: Carol Vickery of Tao Herb Farm.
Resources: The Encyclopedia of Organic Gardening - a giant book of 1145 pages for only $16.28!
Insect Repellent Recipe
Mix all ingredients together. This combo is excellent for drawers, cupboards or anywhere bugs like to hide.
- 1 cup each of Mugwort, Santolina, Sage, Rose Geranium, and Lavender
- 1 tsp. Thyme oil dropped onto the mix with 1/2 cup salt
- 1 handful of Bay Leaves and Cloves
Other related articles:
- Companion Planting: chart of compatible plants & beneficial effects. Prevent insects & disease in your garden.
- Pest & Disease Control
- Here's how you can work with nature to control pests and diseases, and enjoy a healthier garden and harvest.
Pest Control Products
Cat Scat Mats, Set of 5
Keep neighborhood cats from using your garden as a litter box with Cat Scat, the non-chemical way to say "No Trespassing!". Simply cut each mat into four pieces and press into the soil where you want to discourage feline excavation. The flexible plastic spikes are harmless but effective. Humane, chemical-free deterrent. Prickly plastic teeth irritate cats without harming them.
Snail & Slug Traps, Set of 2
The only thing more repulsive than a live slug is a dead one. This professional-quality trap has a removable inner chamber you simply lift out, empty, and rinse clean. What's more, the trap sits underground so it practically disappears in the garden; only the earth-colored lid is visible. You'll never again have to touch a slimy slug! Removable inner chamber rinses clean. Lid is self-locking to keep out rainwater and animals. Includes 6-month supply of all-natural, non-toxic bait. Bait is eco-friendly, can be emptied in garden.
Soapstone Box with Two Fruit Fly Traps
Unlike sticky, unsightly flypaper, our Fruit Fly Traps are enclosed in a tasteful hand-carved soapstone box. The all-natural, non-toxic lures are simple to use, mess-free and safe around food. Flies are trapped out of sight. After a month you simply throw the trap away.
Pantry Bug Traps, Set of 2
Here's a safe, non-toxic way to help keep flour, cereals, and pet food free of pesky meal moths. The disposable cardboard trap lures moths with a natural sex lure, trapping them on the sticky surface inside. Earth-friendly, non-chemical insect control.
Those little black flying insects that hover over your houseplants are not just a nuisance. They're destructive fungus gnats, which live in soil and produce hungry larvae that devour plant roots. Gnat Guard to the rescue! A single application of this biological control (naturally-occurring beneficial nematodes) gives your plants permanent protection against gnats and thrips. Safe for people, animals and the environment.
Send Moles Scurrying From Your Yard. This Mole Chaser gets rid of burrowing rodents who treat your yard as an underground highway and your plants as a free lunch! Buried in your yard, it blasts a penetrating pulse that humans and pets won’t hear, but which forces moles to pack up and leave.
Mosquito Control Rings, Set of 6
Any standing water can breed swarms of mosquitoes, even your birdbath or rain barrel. These Mosquito Controls contain Bt Israelenis,' a naturally occuring bacterium that kills mosquito larvae for a full 30 days without harmful poisons. Each slow-release, floating Control Ring treats 100 sq. ft. of surface area in your pond or water garden. Helps prevent West Nile disease!
Dog and Cat Garlic Clips
Deer, rabbits, dogs & cats have a sense of smell up to a hundred times greater than ours, so just imagine how they react to these powerful garlic repellent clips! They're made with a concentrated garlic oil that is 1,000 times stronger than garlic juice, yet is organic and completely safe. Attach handy clips to trees and shrubs. Stake into the ground to form a barrier—metal probe included. Garlic odor gets out but rain can't get in, so clips last up to 6 months.
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