Blue cypresses are robust if they are in a favorable location and are well cared for. A lot of damage, such as brown spots, can be traced back to care errors. Sometimes fungal diseases or pests are responsible. How to recognize and treat blue cypress diseases.

Brown spots on the cypress are a sign of disease

Brown spots due to incorrect location or pruning

If the blue cypress gets brown spots, this is often due to an unfavorable location. Plant blue cypresses in as sunny a spot as possible. The plant also does not tolerate environmental influences such as road salt or dog urine.

Many brown spots appear due to improper care. Don't let the soil dry out, but avoid waterlogging. Fertilize as directed. Too much fertilizer is just as harmful as too little.

A wrong pruning can also cause brown spots. Never cut directly into the scrap wood, always leave some twigs with needles.

Fungal diseases due to unfavorable location

Fungal infestation occurs relatively frequently in very humid locations. You can tell that a fungus has attacked the plant by the fact that the shoot tips die off and many brown spots appear. If there are no signs of eating on the affected parts of the plant, there is a fungal disease.

Cut off the affected parts of the plant generously and dispose of them with the household waste, never with the compost. Also collect fallen shoot tips!

There is no effective chemical control so far. Therefore, keep a close eye on the blue cypresses so that you can intervene quickly.

Identify and treat pest infestations

Two pests bother blue cypresses: thuja leaf miner and thuja pin beetle. An infestation usually manifests itself as follows:

  • Shoot tips wither
  • Feeding passages visible at the tips of the shoots
  • Shoot tips die off
  • Shoots are hollow inside

In the event of a pest infestation, cut off all affected parts and dispose of them with household waste. If the infestation is very severe and detected too late, the poisonous blue cypress can usually no longer be saved.

In order to protect the other false cypresses and arborvitae, it is advisable to use insecticides that are available in specialist shops.

tips

If the blue cypress sheds a few needles or whole shoot tips in September, this is not a sign of disease. This is a natural process.

Category:

Garden design