Cypress trees - recognize and combat diseases and pests


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Although the cypress is an undemanding plant, you can still put your grooming problems seriously. Even from pests, the plant is not immune. Basically: Immediately intervene to protect the plant.

Cypress - Detect and combat diseases and pests

The cypress is characteristic for Mediterranean landscape forms and determines the landscape in Tuscany and other Mediterranean regions. The evergreen trees have different growth forms and are characterized by a rapid and lush growth.

Some cypress species are true survivors and also grow in dry and rough mountainous areas. The cypresses found in the open air or in pots in Central Europe are also quite undemanding. When diseases and pests occur, fast action is required to maintain the plant. Even preventative can be done a lot, so that the joy of caring for southern charm plants is not clouded.

Easy - maintain the cypress properly

The cypress is an undemanding plant and quite suitable for the rather inexperienced hobby gardener. A sandy-humic soil provides the preferred site conditions. The biggest care mistake is insufficient watering. Sufficient water is needed not only in hot summers, but also in winter.

Elixir of life water

Regular watering is essential in the cypress. The need for water increases when the plants get a draughty location. The wind leads to increased soil dryness. This can be counteracted by the application of a mulch layer. Hardy cypresses defy cold temperatures, but die of thirst if not sufficiently watered.

" Tip: Potted plants protects a drainage layer of potsherds or pebbles from dreaded waterlogging.

❍ Possible diseases of cypress

Brown spots

If cypress trees are not watered enough, brown spots will soon show up. The brown spots show more in spring, this is usually due to a too dry winter. If brown spots appear, the plant should be examined more closely, because also fungal infections or pest infestation can be noticeable by brown spots.

Danger: Brown spots on cypresses will not disappear by increased casting. A radical pruning can not be avoided.

fungal infection

Brown spots on cypresses can also indicate a fungal attack. This is especially common when the brown spots continue from the inside to the shoot tips. Now fast action is required. It is important to find out the type of fungus and to initiate appropriate measures to fight fungus.

»Phytophthora cinnamomi - danger to the roots

In addition to cypresses, juniper, thuja, azaleas or rhododendrons are attacked by this fungus species. More than 900 different plant species belong to the host of this soil-borne fungus. The cypress gets infected via the root, which initially goes unnoticed. The fungus prefers spreading in summer temperatures over 25 degrees. Sufficient moisture also promotes germination of the spores. The fungus multiplies quite quickly within the plant. It shows brown spots and individual shoots begin to die off.

Danger: There is a possibility of confusion with the Thujaminiermotte or Juniper Moth.

Sick plants should be removed immediately. If the cypress is dug up, the fungal infection can be recognized well by the brown discolored root ball.

What can be done preventively?

Vermeiden Avoid waterlogging
❷ loose soil
❸ Lay drainage
❹ administration of plant strengthening agents

»Kabatina Thujae - danger to bastard cypresses

This fungus not only attacks the eponymous trees, but also occurs in Leyland cypress trees. The appearance of the microfungent favors a nutrient-poor soil. Especially a lack of magnesium and calcium can contribute to the fungal attack. Infested cypresses can be recognized by yellow-brown discoloration of the needles. In affected shoots, the bark shows a strong browning. A formation of black pustules also indicates affected shoots. In the later stage the pustules can also break open.

What measures are required?

Entfernen remove affected parts of plants
❷ clearing to dense plant stands
❸ pay attention to a balanced supply of nutrients
❹ Control of the fungus by Ortiva, Dithane or other fungicides

❍ Pest infestation in cypresses

The otherwise fairly undemanding cypress can occasionally be attacked by pests.

Mainly with cypresses a pest infestation of:

  • leafminer
  • Bark beetle or lice displayed.

Minier moths - Plant danger in a double pack

False cypress can be attacked by the Juniper Moth or the Thujaminiermotte. Both species are about five millimeters small butterflies, reminiscent of moths. Differences are to be found in the life cycle of both species.

In both species, oviposition takes place in the leaf scales of the plants. After hatching, the larvae drill into the tips of the shoots and begin to hollow them out. In said periods, the pest infestation can be easily detected by shaking the plants. Then a brief resting of the moths is observed. On closer inspection, the infestation also shows brown discoloration of shoot tips. Damaged branches are hollowed out inside and black crumbs can be recognized, these come from the elimination of moths.

Danger: Fungus also shows similar signs, but fungi-damaged plants are not characterized by hollow shoots.

An infestation with miner moths is usually well tolerated by healthy and regularly cut back plants. If the infestation is particularly large, commercial preparations can be used against biting insects. The foliage, which is attacked by larvae, is generously cut out. The waste should not land on the compost. Stow the infected parts of the plant airtight in plastic bags and dispose of them with household waste.

For prevention, the plant can be covered. The trade offers pheromone traps. These attract mating willing males, which get caught in the sticky traps. While these traps do not provide 100% protection against pest infestation, they do indicate whether infestation is indicated and how high the potential risk is. The hobby gardener can take countermeasures so early. The traps should be left in the plants until autumn, because the pests provide three to four times a year for offspring.

If the traps indicate an infestation, swift action is required:

Entfernen remove already affected parts of plants
Regelmäßig Check the plant regularly
Verbr Dispose of infected leaves or dispose of them in airtight packaging
Ab Cover plant with a tight mesh

Bark beetle - Death blow for cypress

Bark beetles are the biggest threat to cypresses in our gardens. In late spring, the black beetles, which are only about two millimeters in size, begin to hatch. First, the bark beetle quenches its hunger on the young shoots.

This so-called Reifungsfraß shows itself on brown drive pieces of different lengths, which appear kinked. At the kinks are often identify the causer. This damage can be easily confused with a plant mortality of the plant due to lack of irrigation or frost damage after the winter.

After ripening, oviposition follows the bark of the plants. The larvae lay after their hatching extensive feeding. It comes to the death of the entire plant. On the branches, the approximately pinhead sized boreholes can be seen. If an incision is made in the bark, the feeding processes created by the larvae are clearly visible. The bark beetle can destroy entire forest stands. To go against the bark beetle in your home garden is hopeless. Infested plants should be removed immediately.

How to recognize the infestation by the bark beetle?

  • Drilled flour at the end of the stem
  • Cypresses lose their bark
  • brown branches
  • Dying off the whole plant

cypress cancer

The cypress cancer is triggered by fungal infection. Affected plants can be recognized by a striking yellow and red color of the branches. In the later stage the branches dry up. The bark also shows discoloration at a later stage of the disease and breaks up. A spread of the fungus is favored by rain and wind. In this case, plants that are particularly draughty or have injuries, particularly vulnerable.

What should I do?

Completely remove affected parts of plants
❷ Provide interfaces with benzimidazoles
Des disinfect all tools used with alcohol

How to avoid diseases and pests on cypress trees?

  • pour regularly
  • provide sufficient moisture even in winter
  • Avoid waterlogging
  • Remove brown shoots regularly
  • do not make cuts in the old wood
  • Fertilize with compost or conifer fertilizer
  • supply older plants with Epsom salt to avoid magnesium deficiency
  • regularly check for fungal or pest infestation

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