Home › Nursery Stock › Article

Why are there cone-like objects on young spruce trees? Control of the larch adelgid

Nursery Stock 0 views
On young spruce trees, round objects resembling small cones often appear in June. They are actually galls formed by the damage of the larch adelgid (Adelges laricis). Completing one life cycle of the larch adelgid requires several transformations through different forms on two tree species, spruce and larch. For its life process, see "156. What are the white hairs on larch leaves". Before the galls split open, remove the galls on spruce by hand. Strengthen preventive measures to prevent the transport and planting of infected seedlings. Spruce and larch must not be planted mixed or close together; the isolation distance

On young spruce trees, round objects resembling small cones often appear in June. They are actually galls formed by the damage of the larch adelgid (Adelges laricis). Completing one life cycle of the larch adelgid requires several transformations through different forms on two tree species, spruce and larch. For its life process, see "156. What are the white hairs on larch leaves".

Before the galls split open, remove the galls on spruce by hand.

Strengthen preventive measures to prevent the transport and planting of infected seedlings.

Spruce and larch must not be planted mixed or close together; the isolation distance must be more than 500 m (meters).

Protect natural enemies in the forest, including ladybugs, lacewings, brown lacewings, hoverflies, and others.

Related Articles