The resin is very valuable for conifers. It protects them from enemies and seals wounds. The resin has numerous properties that make it a special natural substance.
Tree resin consists of a mixture of different terpenoids and essential oils. Special cells in the needles and resin passages produce resin and direct it to the trunk. A resin channel develops in the spaces between the cells. The canals are surrounded by glandular cells. To keep the canals open, they are surrounded by a conditional wreath of sclerenchymal fibers. Thus, the resin channel can withstand higher pressure without breaking. The resin channels run in the trunk from top to bottom and across the tree. Together they form a three-dimensional network.
But what is important resin for conifers?
Pine resin is one of the substances that spoils the appetite of predators. If the pest inserts its proboscis into the needle, the tree responds. The resin cell fluid enters the puncture wound and closes the hole. The pest often loses pleasure in its food or, when unlucky, sticks to it.
Coniferous trees react similarly to unwanted intruders in the bark. Bark beetles and other pests that lay their eggs under the bark drill the bark of the selected tree. A healthy tree reacts immediately to an uninvited guest with countermeasures and does not allow the attacker to move forward. But pests have already managed to bring fungal pathogens into the wound of the tree. The resin closes the wound and, thanks to antibiotic and antifungal components, helps to prevent infection as much as possible. Pests often get stuck in the resin sticking to the trunk, they are easy prey for birds.
But diseases caused by pests weaken the immune system of the tree. Resin plays an important role in this. Energy is required to obtain the resin. If the wood is already weakened, it produces less resin. This pernicious cycle often means that the tree can no longer adequately protect itself from infection.
Numerous insects use this weak spot on trees. They do not choose healthy wood, but specifically attack diseased and old trees because they give less resin. Infection with bark beetles or other insects often leads to the death of the tree.
Therefore, you need to be very careful with your conifers so that they produce enough resin for their protection. You need to make sure that the trees have enough moisture. Do not forget that in winter evergreen plants also grow and in dry, warm weather, the trees should be watered. Periodically feed with special balanced fertilizers that correspond to the season of the year.
But if the trees have acquired a seemingly incomprehensible appearance: the needles have become dull, thin, incomprehensible streams of resin, fallen branches lie under the trees… Timely referral to specialists will help save the trees.