The care of crops and ornamental plants, whether in orchards or urban or domestic gardens, requires constant attention to prevent pests and diseases. Organic farming and the sustainable maintenance of green spaces prioritize the use of natural products to treat pests, thus avoiding exposure to chemical pesticides that can harm the environment and human health.
The application of Natural medicine It's an effective, safe, and affordable alternative for combating insects, fungi, and other pathogens. Furthermore, many of these products can be easily made at home with common ingredients, allowing for pest control without resorting to toxic agents.
Main natural products for treating pests
There are numerous natural alternatives that can be used preventively or curatively to control pests, depending on the type of problem and the plant species affected. Below are the most notable ones and their recommended applications.
Neem oil
Neem oil, extracted from the seeds of Azadirachta indicates, is recognized for his effectiveness as an insecticide and acaricideIt works by interrupting the life cycle of several insect pests, hindering their feeding and reproduction. Its use is fully compatible with organic farming and is harmless to pollinating insects, pets, and people.
- Target pests: mealybugs, aphids, whiteflies, fruit flies, moths, mites and thrips.
- How to use: Dilute 1 ml of neem oil in one liter of water and apply with a sprayer on leaves and stems, preferably at dusk.
Potassium soap
Potassium soap is a biodegradable insecticide It acts by contact, dehydrating and eliminating soft-bodied insects. Its formulation combines potassium hydroxide, vegetable oils, and water. In addition to its insecticidal and acaricidal action, when it decomposes, it adds potassium to the substrate, benefiting plant growth.
- Target pests: aphids, red spider, whitefly, mealybugs and, to a lesser extent, incipient fungal diseases.
- How to use: Dissolve 1 to 2% potassium soap in water and spray on the pest outbreaks, repeating the application weekly if necessary.
Horsetail extract (Equisetum arvense)
With high content of silica and mineral salts, horsetail extract is a natural fungicide Widely used to prevent and treat fungal diseases, also strengthening the resistance of plants to pathogen attacks.
- Target diseases: downy mildew, powdery mildew, monilia, rust, leaf mottling, septoria.
- How to use: Dilute between 20 and 50 ml of extract per liter of water and spray every 2-3 weeks for prevention, or every 3 days as an intensive curative treatment.
Nettle extract and slurry (Urtica dioica)
Nettle slurry or extract, the result of fermenting fresh leaves, is a real multipurpose in the orchard and garden. Plus aphid and mite repellent, is an excellent fertilizer and booster for the plant immune system. For effective control, you can also consult on pest control in citrus fruits.
- Target pests and diseases: aphids, red spider, mildew, chlorosis and general improvement of plant vigor.
- How to use:
- Undiluted: to accelerate decomposition in compost.
- Diluted 1:10 in water: preventative against aphids and mites.
- Diluted 1:20 in water: as a preventative against mildew and chlorosis, and as a seed stimulant.
Garlic: multipurpose repellent and insecticide
Garlic stands out for its repellent property against various insectsThe sulfur compounds released have a strong disorienting effect on common pests such as aphids, thrips, and mites. It can also be considered the combined use of neem oil and potassium soap to enhance its natural effect.
- Target pests: aphids, mites, whiteflies, thrips, mealybugs.
- Preparation: Crush a head of garlic with cloves and two glasses of water, let it sit for 24 hours, add 3 more liters of water and spray on affected leaves and stems.
- Another variant: mix a head of garlic, a liter of alcohol and two liters of water, strain and apply diluted (one part mixture to four parts water).
Onion extract
Onion, due to its sulfur compounds and antioxidants, is useful not only as a pest repellent but also as a disinfectant and plant growth stimulantTo prevent pests in fruit trees, you can consult .
- Target pests: red spider, whitefly, aphids.
- Preparation: Crush three onions, mix with water, let stand overnight, filter and apply with a sprayer, repeating every 7 to 10 days.
Broth or infusions of chili and pepper
The capsaicin in chili and the compounds present in pepper are natural repellents for aphids, caterpillars, worms and whiteflies. For complete pest control, it can be complemented with entomopathogenic fungi.
- Target pests: aphids, whiteflies, caterpillars, mites, thrips and worms.
- How to use: Apply by spraying preferably in the afternoon or on cloudy days to avoid burns.
Tomato extract
Tomato leaves contain alkaloids that make them a Effective repellent against aphids, worms and caterpillars. In addition, it can be used in pest control in melon.
- Target pests: aphids, worms, caterpillars.
- Preparation: Chop two cups of tomato leaves, add water, let stand overnight and dilute in two more glasses of water before spraying.
macerated tobacco
Natural tobacco provides nicotine, a substance toxic to many insectsIts use as a natural insecticide is widespread, although with caution in its application due to the possible effect on beneficial insects, for example, in Cycas revoluta pests.
- Target pests: red spider, aphids, whitefly.
- Preparation: Mix 60 grams of tobacco and 10 grams of natural soap in a liter of water, let it sit for 24 hours, and apply weekly for several weeks.
Cilantro and lavender
Cilantro is excellent for combat mites and worms, while lavender, thanks to its intense aroma, repels ants, moths and various flying insects. Both can be enhanced with insect hotels to promote natural biological control.
- Cilantro preparation: Boil cilantro branches in water for 10 minutes, strain and sprinkle.
- Lavender preparation: infusion of fresh leaves or branches, cool and apply as an anti-pest spray.
Chamomile extract and bicarbonate
Chamomile contains natural sulfur, so it is suitable for Prevent and treat mildew, powdery mildew, and other fungal diseases. Sodium bicarbonate, by raising the pH of the leaf surface, hinders the development of fungi. For more details on plant diseases, see citrus diseases.
- Chamomile preparation: Infuse one or two sachets in a liter of water, spray on leaves and substrate.
- Preparation of bicarbonate: Mix one tablespoon per liter of water, optionally with neutral soap, and spray on affected areas.
Other effective remedies and natural recommendations
- Crushed eggshell: Placed at the base of the plants, it creates a physical barrier for snails and caterpillars, which also fertilizes the substrate.
- Diluted milk: A mixture of two parts milk to eight parts water, applied as a fungicide for powdery mildew, downy mildew, and rust.
- Wood ash: Spread on the substrate, it deters snails, slugs and some insects.
- Beer as a trap: A container of beer in the planting area will attract and trap slugs and snails.
- Vegetable oil and soap: A mixture of oil and soap diluted in water, useful for eliminating soft cuticle insects such as aphids, mealybugs and mites.
- repellent plants: Interspersing aromatic herbs such as mint, basil, calendula, rosemary, sage and thyme helps repel harmful insects due to their scent and the substances they release.
Good practices and preventive measures to avoid pests
Preventing the emergence of pests and diseases is just as important as knowing how to treat them ecologically. Some essential recommendations are:
- Keep the plant healthy: Adequate irrigation and fertilization, avoiding excess moisture and nitrogen-rich fertilizers, so that plants are less vulnerable to attack.
- Do not wet leaves or flowers when watering: Water on the surface encourages the entry of fungal diseases and the suffocation of leaf pores.
- Isolate diseased plants: It is used to prevent the spread of pests and pathogens to other specimens.
- Select healthy plants in nurseries or stores, rejecting those that already show symptoms of pests or diseases.
- Use new substrate in pots to reduce the risk of transmission of microorganisms and pest larvae.
- Disinfect pruning tools before and after each use, using alcohol or disinfectant solutions.
- Promote biodiversity with hedges and plants attractive to useful fauna, such as ladybugs, bees and lacewings, which help with natural biological control.
- Rotate crops and space plants to improve ventilation, hindering the development of fungi and facilitating the early detection of pest outbreaks.
- Avoid unnecessary use of chemicals: reserve them only for extreme cases, following the manufacturer's instructions and taking all necessary safety precautions.
- Monitor sources of moisture and plant debris in the substrate or pot, as they can attract insects or cause the appearance of diseases.
The use of natural products to treat pests It's an effective, affordable, and respectful way to keep any vegetable garden, container garden, or garden healthy. Using the remedies described here, you can combat most common pests—from aphids, mealybugs, and caterpillars to fungi like mildew or powdery mildew—without endangering the health of your plants, biodiversity, or the environment. It also allows you to reduce your dependence on chemicals, improve the soil, and strengthen the auxiliary flora in your green space. Experiment with the different natural formulas, adjust the doses according to the degree of infestation, and discover which one best suits your plant type and ecological needs.
