Pine silkworm Dendrolimus pini. Interesting facts

The pine silkworm Dendrolimus pini is a nocturnal butterfly that belongs to the family Lasiocampidae. This insect is one of the most widespread and dangerous pine pests in Ukraine and other countries.The pine silkworm can cause significant damage to forestry as it damages needles, reduces wood productivity and quality, and promotes the development of other pine diseases and pests.

In this article, we will tell you about some interesting facts about the pine silkworm that may be useful for foresters, ecologists, scientists and nature lovers.

How does the pine silkworm look like?

The pine silkworm has a long and curved snout with mouthparts at the end. The insect’s body is red or brown, and its length is 6-8 mm.

If mass reproduction of the pine silkworm occurs, the insects can destroy entire areas of pine trees, a phenomenon that is possible every 8 years. After the silkworm butterfly, bark beetles (Scolytinae), whisker beetles (Cerambycidae), and buprestids (Buprestidae) may appear on weakened and dried trees.

The pine silkworm is particularly active at dusk and at night. This pest causes damage to other coniferous tree species, but is most dangerous to Scots pine (Pinus sylvestris), spruce (Picea) or European white fir (Abies alba).

How does the pine silkworm damage pine trees?

The pine silkworm damages pine trees by feeding on its needles. The pine needle borer caterpillars damage the young branches growing on the sides and damage the needles on the sides and near the top.Damaged needles cannot perform its functions properly, which leads to a decrease in productivity and wood quality, as well as a decrease in the aesthetic value of the tree.The pine silkworm also contributes to the development of other pine diseases and pests, such as pine bark beetle, Melampsora pinitorqua Rostr, pine rot, pine moth, etc. These diseases and pests increase the damage to the pine tree, which can lead to its death.The wings of the pine silkworm are very similar in colour to the pine bark, so it is difficult to spot the insect on the surface of a tree. During its development, one  caterpillar can eat 700 needles.

Silkworm caterpillar

If you see signs of pine silkworm activity on the surface of a pine tree, do not hesitate to contact us for help, as timely treatment and prevention is the key to saving and improving the health of green spaces.