Tamarack
Guides
Dendroctonus simplex
Eastern Larch Beetle
Dendroctonus simplex, the eastern larch beetle, is a bark beetle in the family Curculionidae that colonizes the phloem of tamarack (Larix laricina). Historically a secondary pest attacking stressed or dying trees, it has undergone an unprecedented 18-year outbreak in northern Minnesota since 2000, killing over 440,000 acres of tamarack forest. Research indicates that warming climate has enabled some populations to complete development without an obligatory overwintering period, potentially allowing multiple generations per year. The beetle is a holobiont, engaging in multipartite symbiotic interactions with bacteria and fungi that facilitate host colonization and detoxification of terpenes.
Macaria oweni
Owen's larch looper, Owen's angle moth, Owen's Angle
Macaria oweni is a small geometrid moth native to northern North America. The species is specialized on tamarack (Larix laricina) as a larval host. Adults are active during early summer, with a single annual generation. The moth was first described from specimens collected in New England.
Pristiphora erichsonii
Larch Sawfly
Pristiphora erichsonii, commonly known as the larch sawfly, is a species of sawfly native to Europe that was introduced to North America in the mid-to-late 19th century. It is a significant defoliator of larch trees (Larix spp.), particularly tamarack (Larix laricina) in North America. The species undergoes population outbreaks that can cause severe defoliation, though trees typically recover from single-year damage. Severe defoliation over multiple years can weaken trees and reduce winter survival. The species has been the subject of extensive ecological and population dynamics research due to its economic importance in forestry.