Resin- pockets can only be found on conifers. This is not a new phenomenon. But it is striking that conifers in the urban surroundings more often show resin-pockets. There is need to investigate if this is related with certain circumstances in these surroundings.
Changes in the surroundings of trees can cause stress. It is known that stress causes a increased development of resin- pockets at conifers. This situation makes trees vulnerable for other diseases.
Investigation about the cause and effects of resin-pockets at conifers can help us to make the risks manageable.