Phloeosinus armatus

Reitter, 1887

Phloeosinus armatus is a bark beetle in the Scolytinae, the largest in its . Native to the Middle East and eastern Mediterranean, it has been introduced to Italy, Russia, and North America. The species colonizes Cupressus sempervirens (Mediterranean cypress), forming gallery systems on trunks and large branches. It acts as a for phytopathogenic fungi, including Seiridium cardinale, the agent of cypress canker .

Pronunciation

How to pronounce Phloeosinus armatus: //ˌfloʊ.iˈoʊ.sɪnəs ɑrˈmɑːtəs//

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Identification

The largest in Phloeosinus. Distinguished from by size and association with Cupressus sempervirens. Gallery systems show characteristic 'two-arms' longitudinal patterns on trunks and large branches. Identification keys follow Pfeffer (1995).

Habitat

Cypress stands and forests; specifically colonizes trunks and large branches of Cupressus sempervirens. Found on dead trees, decaying trees in roadside rows, and adult trees in green areas.

Distribution

Native: Middle East including Iran, Azerbaijan, Syria, Jordan, Lebanon, Israel, Turkey, Greece, and Cyprus. Introduced: Italy (first reported 1991, confirmed 2013), Russia (Sochi, Black Sea coast, introduced via infested nursery plants from Italy), and Nearctic areas including the United States.

Diet

Phytophagous; feeds on Cupressus sempervirens (Mediterranean cypress).

Host Associations

Cupressus sempervirens - primary plant
Seiridium cardinale - fungal causing cypress canker
Geosmithia omnicola - associated fungusisolated from insect body surfaces and gallery wood chips
Penicillium glabrum - associated fungusisolated from insect body surfaces and gallery wood chips
Pestalotiopsis hollandica - associated fungusisolated from insect body surfaces and gallery wood chips
Geosmithia microcorthyli - associated fungus
Cytospora spp. - associated fungus
Epicoccum nigrum - associated fungus
Trichoderma viride - associated fungus

Life Cycle

excavate gallery systems on trunks and large branches. Fertilized females initiate maternal tunnel excavation. Pre-imaginal forms develop within galleries. occurs in gallery chambers. New adults emerge through penetration holes, with visible along trunks and at tree bases.

Behavior

Primary phytophagous capable of colonizing weakened trees and plants with temporary physiological imbalances. form gallery systems with typical 'two-arms' longitudinal patterns. Acts synergistically with plant pathogenic microorganisms, actively vectoring fungi that cause cypress canker.

Ecological Role

Pest causing irreversible environmental and landscape damage to cypress plants of naturalistic value. Accelerates transmission of phytopathogenic fungi. Contributes to plant stress, gradual dieback of aerial parts, shoot death, and reduced growth. Part of complex interactions between phytophagous insects and fungal in imbalances.

Human Relevance

Significant pest of ornamental and historically valuable Mediterranean cypress plantings. Causes landscape degradation in regions where cypress is culturally and ecologically important. Management concerns in urban green areas, roadside plantings, and natural cypress forests.