Aphids are fearsome insects that attack leaves and feed on plant sap.
Leaves curl up and become sticky.
Key facts about aphids
Name – Aphidina
Common name – aphid
Appears in – spring, summer, fall
Favorable conditions – most plants might be attacked, but the weakest plants are the most vulnerable.
Having a garden brimming with insects, especially ladybugs, greatly helps control aphid populations.
Regular treatments against aphids will help you consistently eliminate them and keep them away from your plants and rose trees.
Effective organic aphid treatments
The following treatments can help fight aphids, and if one particular strategy doesn’t seem to work, you can apply several solutions together. Associating repellent plants and treatments is most effective.
- Since ladybugs eat aphid larvae, they naturally contribute to controlling aphid populations. This method is increasingly practiced by professionals who manage parks, and it is 100% organic.
Fermented stinging nettle or fern tea
- It is sold now in horticulture stores but can be produced naturally too.
- It is an excellent 100% organic way of fighting aphids.
Learn to make your own fermented stinging nettle tea.
Fermented rhubarb tea
- Easy to prepare as early as April with fresh rhubarb leaves, here is our fermented rhubarb tea recipe.
- Made with Marseille soap or beldi soap dissolved in water and sprayed on the plant, this soap mix makes it hard for aphids to stick to leaves.
Grate 5 oz (150 grams) of soap and dissolve it in 1 quart (1 liter) water, add and mix in 1 tablespoon vegetable oil. Spray on plants.
Aphid repellent plants
- Planting aphid-trapping plants such as nasturtiums or aphid repellents such as French marigolds and above all lavender naturally helps control aphid populations.
- Fighting ants is necessary when they have established their nest.
Ants attract aphids and fuel their spread.
Here are good techniques to rid your garden of ants.
- These are excellent aphid predators, but they are only active from 60°F (16°C). They are rarely sold in horticulture stores.
- Products based on this plant can be used in organic farming. This is one of the main ingredients in aphid-control products sold on the market.
It is very effective and will mercilessly annihilate these parasites.
Special flowered lawn mixes are prepared these days, which repel most parasites and specifically aphids when the combination of flowers start to bloom.
- This flowered lawn mix can be sown in gardens and in the vegetable patch to protect vegetables.
Finally, a basic rule is to reduce use of chemical products as much as possible.
They usually wreck havoc in the local ecosystem, and weaken natural defenses that usually make plants immune to diseases and parasites.
Smart tip about aphids
- All chemical treatments have heavy impacts on our environment, so think of the planet and use organic aphid treatments!
- Species that are routinely attacked by aphids include of course rose trees, but also whole trees such as lime trees or basswood or spruce and also certain fruit trees like pear trees, peach trees or cherry trees.
- Watch for leaves turning black as soot, this matches symptoms of sooty mold, which is a direct consequence of an aphid invasion.
- Hedges, great barriers against diseases and parasites.
- How to fight caterpillars.
- How to fight scale insects.
- How to fight cherry flies.
- All our pages on treating diseases and parasites.
Credits for images shared to Nature & Garden (all edits by Gaspard Lorthiois):
Green aphids shared by Joseph Holt under © CC BY-NC-ND 2.0
Aphids with ladybug & ant shared by Myriams-Fotos under © CC0 1.0
Aphids on flower shared by Foto-Rabe under © CC0 1.0