Content
- Which diseases cause yellow needles of the yew?
- Yew not yellow needles by diseases
- An unfavorable location
- Pests on the yew provide yellow needles
- Tips
Yellow tips can have very different causes
Which diseases cause yellow needles of the yew?
The yew is a native, highly resistant tree that rarely suffers from disease and even less frequently from fungal infection. If yellow needles appear on the yew, either pests or an unfavorable location are responsible. How can you prevent yellow needles on the yew?
Yew not yellow needles by diseases
If the yew gets needles, which also fall off, it is usually not a disease to blame, but an unfavorable location or infestation by pests, and more rarely by fungi.
In most cases, needle staining can be prevented if you pull the yew in a convenient location and care for it properly. Well-groomed yews are also coping well with pest infestation.
An unfavorable location
Yews tolerate every location, even shade or direct sun. This is true only for older trees. Young yew trees suffer from strong sunlight and react with yellow or brown needles. This also happens in winter, when the winter sun falls directly on the needles.
Therefore, when planting, make sure you have an ideal location where the young plant will be sufficiently shaded at lunchtime.
The yellow needles, which are caused by a bad location, do not look nice, but are not dangerous for the tree. At the latest next year, the needles are green again.
Pests on the yew provide yellow needles
Yellow needles can also be caused by pests. Not very often but occasionally the scale is found on the yew. It is too bad to see with the naked eye. Running ant trails on the tree, an infestation is likely.
If there is a suspicion of thyroid lice infestation, take the following control measures:
Scale insects have a strong shell that chemical agents can not penetrate. Better use biological agents such as parasitic wasps.
Tips
In winter you should water yews on frost-free days when it was dry for a long time. They suffer from excessive drought, especially the trees are very young and the roots are not so strong in the soil.