Dioryctria sylvestrella

Maritime pine borer

Description

Dioryctria sylvestrella, also known as the maritime pine borer or new pine knot-horn, is a moth species within the family Pyralidae. It is native to Europe, parts of Asia, and North Africa. The moth has a wingspan of 28 to 35 mm and is characterized by dark greyish-brown forewings with white zigzag markings. Maritime pine borer D. sylvestrella primarily infests maritime pine (Pinus pinaster), though it also feeds on other pines like Pinus nigra, Pinus pinea, P. sylvestris and occasionally spruce. The larvae bore into the buds, shoots, cones, and stems, causing resin exudation and weakening the tree. This pest is a significant problem in Mediterranean pine plantations where maritime pine is grown for timber, resin, and dune stabilization. The moth flies in a single generation from July to September.

Symptom

The presence of Dioryctria sylvestrella is indicated by resin exudation, wilting or damaged pine shoots, and boring into young stems and cones, leading to weakened trees and potential fungal infections.

Tree Species: Pine

Part of a plant- attacked: Tree trunk, Leaf / Needle, Fruit / Seed, Branch

Pest significance: Harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes