Which pests are found on yew trees?
- Scale insects
- lice
- Weevil
- Gall wasps
Basically, it can be said that a healthy tree that is well cared for can easily cope with a pest infestation on its own. Only if the yew is in an unfavorable location or not a sufficient one care the unwanted guests can cause damage.
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Recognize and fight scale insects
Scale insects are bare with eye not recognizable. If the needles turn yellow or brown or fall off, you should always check the yew for scale insect infestation. If there are ant trails on the tree, an infestation is likely.
Only biological control measures, such as the use of, can help against scale insects Parasitic wasps(€ 69.90 at Amazon *) and removing the ant trails. You should simply cut heavily infested branches and if possible burn.
Treatment of lice infestation
You can spot lice with the naked eye. Lace flies and ladybirds are suitable as biological control. Insecticides can also be used here.
Fight black weevils
Black weevils are in the ground and eat the needles off at night. These pests are very difficult to control. If the infestation is severe, we recommend the use of nematodes, which you can obtain from specialist shops. These roundworms eat the larvae of the black weevil.
How to control gall wasps
If the needles discolor and deform, gall wasps can be responsible. Here it is advisable to cut off the affected branches of the yew radically. The use of biological agents such as Parasitic wasps is only advisable if the infestation is not too severe.
Branches that are infested with gall wasps should not be composted, but disposed of with household waste or burned.
When cutting, make sure that neither needles nor other parts of the plant get on the bare skin. The poisonous sap can cause inflammatory reactions.
Tips
Diseases almost never occur on yew trees. When the yew tree looks sick Loses needles or generally cares, it is mostly due to the wrong location or the water supply.
