Fight beech aphid - help with lice on beeches

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The beech aphid is also known under the names Buchenwolllaus, Wollige Buchenlaus and Buchenblattbaumlaus and Buchenzierlaus. She has a special liking for beech leaves and draws their food from it. On beech trees and hedges it leaves corresponding damage. While strong beeches usually survive an infestation, the beech hedges are more likely to suffer from larger and longer-lasting infestations. In the worst case, this will last until dying, if no fight takes place. The plant guide by Hausgarten calls you effective control methods that are easy to apply and the beech aphids quickly belong to the past.


In order to choose the right pest control method, you need to know in advance what pests it is. The beech aphid recognize the following appearance and beech infestation on certain characteristics:
  • Body length between one to three millimeters
  • Light green to black color
  • There may be dark bands at the back
  • Elimination of white or bluish white wax threads that look like wool
  • Sitting sucking on the leaf bases
  • Leaves and petioles and twigs may feel sticky (honeydew)
  • Brownish spots form until the leaves become very brown
  • Leaves crippled with scrolled leaf margins
  • Increased fall of attacked leaves


The aphid aphid is limited in their food intake usually purely on beech trees or on their leaf dress. In Europe, especially the beech with all its subspecies such as blood and Sünthe beech affected. The beech tree aphids mainly reach the trees and hedges via ants, but occasionally even creep up the trunks themselves. As a rule, they settle in colonies on leaf-like branches and on the petioles. From there, they pull on the undersides of the leaves and suck their food out of the leaves.
At high levels, some remain under the leaves. Sometimes they also infest subordinate plants that thrive under the beech tree, such as the forest ladybug. Other host plants do not colonize the beech aphids.

Boxwood treatment

If a meter-high beech tree has been hit by beech lice, you will find the same characteristics on the leaves as in beech hedges. In higher altitudes, it is more difficult to study the branches and stems more closely for these parasites. As a rule, you have to rely purely on the typical damage of the leaves in order to get the suspicion of book lice.
Since the beech trees get along very well with the pests and these can cause no life-threatening danger to the tree, it is usually sufficient if you simply cut off the branches with affected leaves. As a rule, they are exactly where the leaves are attacked. So the chances are good that you remove all copies with the Astabtrennung.


TIP: Do not throw the affected branches on the compost heap, otherwise you risk the parasites multiplying and making their way back to your beech. Better to burn or cut small branches and dispose of with household waste.

Use of chemicals

The use of chemical insecticides is always associated with a certain risk to the environment, you and surrounding animals. For this reason, the application is only conditionally recommended. It should be used exclusively if there is an immensely extensive infestation of beech leaf lice and a cutting of the branches has shown no or only minor effect.
There are chemical insecticide insecticides available in specialized shops that can be mixed with water in a pressure pump bottle specially developed for large surfaces. With a ladder and a long telescopic spray bar, you can also reach the leaves at a few meters high.

home remedies

Instead of a chemical insecticide is a home remedy recipe with rapeseed oil and effective effect. Rapeseed oil has the property that it adheres to the respiratory tract of the Phyllaphis fagi, thereby increasingly limiting respiration, until eventually the pests suffocate. The rapeseed oil can also be filled into a pressure pump bottle as a water mixture and proceed exactly as described under "Chemical Use". For the production of 10 liters, stick to the following recipe:
  • Mix 3 liters of rapeseed oil with 7 liters of water
  • Fill mixture into the pressure pump bottle
  • Spray the tree over a large area, especially the undersides of the leaves
  • If necessary, repeat at the earliest after 24 hours
  • If necessary, repeat several times
  • After each treatment, shower the tree completely as far as possible
  • Only use freshly prepared rapeseed oil mixture
  • Pour away leftovers
TIP: After each use, rinse the spray nozzle and the inner container of the spray pump well, so that no rape oil residues can settle and stick / block the spray head.


Most beech hedges are kept at a manageable height, so that here the fight against aphids somewhat simpler and also offers more opportunities. Of course, you can also use the methods mentioned, as they are described under the heading "Beech tree treatment". Less cumbersome but it goes with the following control measures.

First aid

If the beech aphid is discovered on your hedge, it is time to act, because this is not as robust against these parasites as a strong beech tree. The first measure is to bring out the garden hose and spray the hedge extensively in the area of ​​damage to the leaves. It is advantageous that the pests are usually on the outer parts of plants, because here the leaf dress is fleshier, as to the hedge inside. This way they can be easily reached with the water jet.


As a rule, a normal water pressure is sufficient for the small pests, as it is common for household water. This is usually at four or five bar. If this is not enough, you can also carefully approach the lice with a high pressure cleaner far away from the hedge and lowest bar level. It is advisable to start with a long distance first and then approach the hedge in small steps. It is important that not all leaves and branches are separated by the immensely higher water pressure. Otherwise, you will not only go after the aphid aphids, but also their hedge for a few months.


If you notice a lice infestation early, a classic collection may be sufficient to prevent it from spreading. The prerequisite for this is that it only causes beetles aphid in a manageable area. With larger infestation areas, you will not be able to prevent spreading by collecting.
To collect, proceed as follows:
  • Affected plant parts with thumb and forefinger include
  • Always start at the bottom
  • Gently squeeze fingers and slowly push up on the plant part
  • Before each re-fingering, rub off collected lice on a paper
  • If necessary, repeat this technique several times
  • Dispose of paper with collected lice in the household waste - not on the compost!
  • Organic plant protection
Especially with beech hedges you should refrain from the use of chemical agents against the beech aphid. Dogs like to sniff at them, cats often do their business in the scrubland and children often walk past the leaves in passing. Inhalation and contact, depending on the ingredients, can lead to severe poisoning and allergic reactions in animals and humans. For this reason, you should only use environmentally friendly and harmless organic plant protection products, especially for beech hedges.
Various manufacturers offer appropriate BIO plant protection products. Some of the best known manufacturers include:
  • Bavarian
  • Neudorff
  • Celaflor
  • natures
  • beneficials
One of the most natural and environmentally friendly measures, is the fight with so-called beneficials. These are small insects whose main foodstuff is the aphid aphid. If you have them in the immediate vicinity, they will quickly find their way up and into the beech hedge. Depending on the species of insect, they can kill up to 800 beech aphids or more per day. As effective beneficials against the Phyllaphis fagi apply especially:
  • ladybug
  • lacewings
  • hoverflies
  • parasitic wasps
You can attract beneficial insects near your beech hedges by placing a so-called insect hotel there. This is often accepted by the insects mentioned and most of them stay in the surrounding area for a longer period of time so that they can simultaneously protect against new infestations.
Alternatively, beneficials can also be obtained through a specialist retailer. Some have them in stock, others have to order them first.

home remedies

Those who completely dispense with purchased products or want to react quickly, but the shops are closed, can also effectively tackle these parasites with simple home remedies.


Since the area of ​​a beech tree is simply too large to spray it dripping wet with stinging nettle broth, this method is therefore only suitable for up to medium-sized hedges. When preparing the brew, proceed as follows:
  • You need about one kilogram of nettles
  • Fill a bucket of water with ten liters of water
  • Push in the stinging nettles
  • Leave the stinging nettles in the water for 24 hours
  • Sieve out the nettles
  • Pour the stock into a pressure pump bottle
  • Spray beech hedge generously with dripping wet
  • Repeat procedure after two days
  • Repeat treatment in severe infestation about five times to kill eggs
soft soap
Another effective fight against the beech aphid can be done with soft soap as a lye.
  • One tablespoon of soft soap per one liter of water
  • Alternatively, potash soap can also be used
  • Make sure the potash soap does not contain any additives
  • Add about 10 milliliters of alcohol per liter of water to increase the effect
  • Fill the caustic solution in the pressure spray pump
  • Sprinkle beech hedge massively at the affected areas
  • Apply the lye again after three days
  • If necessary and residual infestation repeat after one week
  • At the end of the treatment the hedge generously with clear water cumshot


In order to prevent a new case and from the beginning to ward off beech aphids, it is advisable to take appropriate precautionary measures.


Since fertilizing beech only makes sense in the first two years of life, you can only prevent it during this time with the right fertilizer.
Beech lice like it when the leaves are beautifully juicy, which is ultimately promoted by nitrogenous fertilizer. Here you should refrain to high bookkeeping to avoid high nitrogen levels. At an optimal location and with good care, even without additional nitrogen, beech leaves are healthy for the first two years.

Organic plant protection

Even without current infestation BIO pesticides are available for prevention in the specialized trade. It is advisable to spray your beech trees and hedges at the beginning of spring. It is important that you reach almost every leaf to get complete protection against the beech aphid. As a rule, high-quality products, such as those of Bayer or Neudorff, keep their effect until autumn, when these parasites are no longer looking for food.
While beech trees are very robust against this species of louse and hardly cause serious damage, the parasitic beech hedges can cause serious problems. With the methods mentioned here for controlling the beech aphid, you can get rid of them quickly and effectively. And if you take appropriate precautionary measures, you will not have to worry about further infestation in the future.

Video Board: How To Get Rid of Woolly Aphids.

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