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Rapeseed oil against aphids (including recipe for spray): Why the home remedy quickly helps to fight the pests.

In winter, they make themselves at home in the container garden in the greenhouse, and from mid-May aphids also infest garden plants. When preventive measures fail, then it is the time to fight the pests. But how? Insecticides are often harmful not only to the insects, but also to humans and pets. Another option is to use a home remedy. In today’s post, we’ll explain how you can use canola oil against aphids.

Fighting aphids: This is how you should proceed

Use canola oil against aphids how often

In order to successfully combat aphids, you should know a few things about their way of life. The first two-three generations of aphids have no wings and remain on the host plant for life, where they feed and lay their eggs. Only in the middle of summer or at the end of summer aphids hatch with flies, which then quickly infest other plants . So if you spray the plants in the spring or early summer, then you can treat only the affected specimens. In late summer and fall, you should also treat the neighboring plants. For houseplants and plants in greenhouses or conservatories, it is best to spray all specimens that are within a radius of one meter.

Rapeseed oil against aphids: why the home remedy is so effective

Use canola oil against aphids as a preventive measure

Most home remedies against pests have a limited effect and can only reduce the infestation. In contrast, milk and canola oil have proven to be effective remedies against the insects. They have a similar effect and form a film that envelops the aphids. The insects cannot breathe and die. Canola oil can help not only against the aphids, but also against their eggs.

Make your own canola oil mixture against aphids

Canola oil against aphids use on the bottom treat

However, canola oil is very thick and cannot be sprayed. So, the first thing you need to do is dilute it with water. Fill 50 ml of canola oil and 10 ml of soft soap (without bleach) into an empty and clean jam jar with a screw cap. Then shake the jar vigorously so that the ingredients combine well. You can store this mixture in an airtight container for about three months. Thanks to the soft soap, the mixture will stay on the plants much longer.

Prepare spray with rapeseed oil and soft soap.

Spray with canola oil to treat aphids


Before each use, you need to dilute the mixture. For this purpose, pour 1 liter of lukewarm water into a spray bottle and add 1 tablespoon of the mixture. Again, shake vigorously and then use immediately after preparation.

Use canola oil spray and treat roses with it

  • The spray prevents the formation of a special wax layer that protects the plants from the strong rays of the sun. However, this effect is temporary. After one or two days, the plants begin to form the protective layer again. In the meantime, however, they are very sensitive and can quickly burn under direct sunlight.
  • To prevent this, place the tubs and pots in a shady place in the garden after spraying them with the home remedy.
  • The garden plants are best sprayed late in the afternoon. Under no circumstances spray the plants on a hot, sunny day because they will burn, dry up and die.
  • Carefully spray all above-ground parts of the plant, including above and below the leaves. Wet the plants well.
  • The home remedy is not harmful to humans and animals. Therefore, you do not need protective clothing.
  • Young plants may be sensitive to the canola oil. In this case, you can treat the pests with another home remedy.

Spray the aphids several times in the course of a week, so that you can also control the newly hatched pests. In case of heavy infestation, you should repeat the procedure every two weeks. In case of a light infestation, it is sufficient to spray the plants two – three times. As a preventive measure, you can spray the plants once a week.

Preventing aphids: what you should pay attention to

Use vegetable oil against aphids for treatment


After treatment, it is very important to prevent further infestation. You can do this by relocating the plants in the garden. Try to plant as many different species as possible in one bed. Beneficial insects can also help prevent a second infestation. Also, try to strengthen the plants with fertilizers. Weak, ailing shoots and stems are susceptible to pests and diseases.

Aphids are one of the most common pests in the home garden. However, infestations can be difficult to detect during the first week. Curled, dried leaves and eggs on the lower leaf side are a sure sign of an infestation. If you check your houseplants and garden plants regularly, you can then act quickly. If you always have a home remedy at hand, then you can fight the aphids quickly and easily.