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Matsucoccus pini

European pine bast scale

Description

Matsucoccus pini, commonly known as the European pine bast scale, is a small insect pest that primarily infests various pine species, including Scots pine (Pinus sylvestris), Swiss mountain pine (P. mugo), and black pine (P. nigra). Adult females are wingless, light brown, and approximately 3 mm in length, residing in bark fissures. They feed on the phloem, leading to weakened trees and increased susceptibility to environmental stressors and secondary pests. Typically, M. pini overwinters as first-instar larvae and completes one generation per year. This species is widespread in Europe and is notably abundant in areas affected by industrial pollution. However, its populations are generally low across most regions, making it a rarely encountered species. There is information indicating a strong outbreak around 1970 in Poland, where it was considered one of the main reasons for widespread pine dieback in certain areas.

Symptom

Infested trees display yellowing needles, resin exudation, and visible brown or oval spots under the bark. Small, round holes in the bark may also appear (note that this symptom is typical for other species as well, so caution is advised in identification). Severe infestations can lead to tree decline and, in extreme cases, tree mortality.

Tree Species: Pine

Part of a plant- attacked: Tree trunk

Pest significance: Harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes