Content
- Common diseases on the conifer
- Diseases due to site or care errors
- Common parasitic diseases
- rust
- needle tan
- Root and stem rot
- Pestalotia-twig blight
- gray
- Tips
Brown needles can be the result of illness or PFF
Common diseases on the conifer
Most conifers are considered robust, but can still be attacked by various pathogens. Particularly endangered, for example by mushrooms, are thereby Lebensbäume (Thuja) and spruces. Many of the micro-organisms infect different species, but some are very specialized.
Diseases due to site or care errors
In addition to a simple infestation with a harmful fungus or other pathogens, a conifer can also fall ill as a result of an inappropriate location and / or care. The causes are not mutually exclusive, but cause each other: Many microorganisms preferentially infest already weakened trees, which can no longer defend themselves. To prevent diseases, you should avoid these causes above all:
Common parasitic diseases
If signs of disease appear on a conifer, they can have different causes. Often the needles are affected, which turn brown and fall off.
rust
There are various rust fungi, such as the pine bubble rust and the juniper rust (the latter causes the dreaded pear grid in pears), which hinder the transport of water in trunk and branches. As a result, infected tree parts turn brown and eventually die due to undersupply.
needle tan
The tan also causes instinct and branching, which is caused by various fungi. The syndrome is often already in the spring, when individual shoot tips first tan and then die off.
Root and stem rot
This disease is also known as Phytophthora rot and is caused by the soil-borne fungus Phytophthora cinnamomi. The infection occurs mainly as a result of an astounding soil, with first rotten roots and later on the trunk. A typical sign are spongy, violet discolored spots both at the roots and at the trunk.
Pestalotia-twig blight
This is a debilitating parasite that mainly attacks already weakened conifers. Pestalotia funerea causes a graying of shoot tips.
gray
Botrytis cinerea has a large host range and does not stop at coniferous trees. An infection occurs especially in cold, humid spring and causes a brown coloration of the young, still soft shoot tips.
Tips
Some diseases affect only certain types of coniferous trees, whereas adjacent trees are not attacked. Cause are micro organisms or also pests, which specialized in certain hosts. A typical example is the pine dump, where a large part of the needles is dropped.