How can you get rid of flea beetles in the vegetable garden?

Known as ‘flea beetles’, these insects are a real nuisance. As the temperature rises, they eventually take over the whole vegetable patch. Cauliflower, turnips, radishes, potatoes… A whole range of vegetables end up with holes in their leaves after a colony of flea beetles has passed through. Here are some foolproof tips for getting rid of these tiny beetles.

Put up an insect screen

Putting up an insect net is a good habit to adopt to better protect your vegetable patch. To prevent your vegetables from being overrun, it’s best to put this protective barrier in place in early spring. This is because flea beetles multiply more easily when the weather starts to get warm. Generally speaking, these insects’ egg-laying season is between April and May. By fitting a protective net over your plants, you’ll prevent these pests from multiplying. Made of fine mesh, the insect barrier is highly effective. Take the time to check that it is securely fastened to ensure the best possible results. That way, you’ll be completely safe from any nasty surprises.

Water your plants frequently

You don’t need to spend a fortune to get rid of flea beetles. To deter these insects, all you need to do is water your plants frequently. Flea beetles cannot tolerate dampness. Therefore, simply spray all the leaves with plenty of water. By doing this regularly, you’ll create an environment that’s unsuitable for flea beetles to lay their eggs. As a result, you’ll spare your vegetables from being riddled with tiny holes. To optimise soil moisture, do not hesitate to apply mulch. As it offers better protection from the sun, mulch is ideal for delaying soil drying out. To obtain good-quality mulch, you can easily use vegetable cuttings.

Opt for companion planting

If you’re a fan of permaculture, companion planting is a concept you’ll love. Generally speaking, it involves planting species that repel flea beetles. Examples include wood ash, tansy and black mustard… Thanks to their scent, these plants help to repel flea beetles. To ensure your vegetables are completely protected from an infestation, you could also consider growing aromatic and hardy plants such as thyme near your vegetables. It is important to note that these methods are used as a preventative measure. If your vegetable patch is invaded by flea beetles, it is worth opting for a more aggressive approach. 

Introducing predators into the garden

To combat flea beetles effectively, you can make use of natural predators such as toads, birds and wasps. To attract these animals to your outdoor space, it is a good idea to create a habitat for them. Creating a pond, for example, is a clever way to encourage amphibians to thrive. If you do not have space for a pond, certain birds such as titmice and finches, as well as wasps, feed on flea beetles. Although nature can help you get rid of flea beetles, it is not always a great help, as it is not always easy to create all the conditions necessary for the survival of natural predators.

Using natural insecticides

Rest assured, you won’t need to spray harmful chemicals on your crops to get rid of flea beetles. A few old-fashioned remedies are effective at putting an end to an infestation of these harmful beetles:

• eggshells, something that usually goes straight into the bin, can be reused to scare off flea beetles. Sprinkle the eggshells, crushed with water, over the rows of vegetables to get rid of the flea beetles;
• ash is also an effective way to repel flea beetles. Simply scatter it around to stop the spread of these pests.

If you’re looking for an effective solution to get rid of flea beetles, try an elderberry decoction. To prepare this natural insecticide, steep 1 kg of leaves in 10 litres of water. Leave the mixture to stand for 24 hours before bringing it to the boil. Once the decoction has cooled, you can spray it onto your plants. Please note that, if necessary, it can be replaced with nettle manure or a garlic decoction.