Tree-mortality
Guides
Alniphagus
Alniphagus is a genus of crenulate bark beetles in the family Curculionidae, comprising approximately eight described species. The genus is notable for containing hardwood-killing bark beetles, particularly Alniphagus aspericollis (the alder bark beetle), which is capable of killing live alder trees—a rarity among bark beetles, as most tree-killing species in this group specialize on conifers. Species in this genus breed in the subcortical tissues of alder trees (genus Alnus) and have been documented from western North America, Africa, and Eurasia.
Dendroctonus
bark beetles, tree-killing beetles
Dendroctonus is a genus of bark beetles in the family Curculionidae, subfamily Scolytinae. The genus name derives from Greek 'dendron' (tree) and 'ktonos' (murder), reflecting its capacity to kill trees. Species in this genus are among the most destructive forest pests in North America, with several species capable of causing extensive tree mortality through mass attacks. The genus exhibits complex chemical communication systems involving aggregation and antiaggregation pheromones, and maintains symbiotic relationships with yeasts and bacteria that aid in digestion and pheromone production.
Dendroctonus brevicomis
Western Pine Beetle
Dendroctonus brevicomis, commonly known as the western pine beetle, is a destructive bark beetle species in the family Curculionidae. It is a major pest of ponderosa pine (Pinus ponderosa) and Coulter pine (Pinus coulteri) in western North America. The species is known for causing extensive tree mortality during outbreaks, with documented losses of 60–90% of host trees in affected landscapes. A notable outbreak occurred in the central and southern Sierra Nevada Range from 2014 to 2017, killing millions of ponderosa pines. The beetle plays a significant role in forest dynamics but also poses substantial economic and ecological challenges.
Dendroctonus jeffreyi
Jeffrey pine beetle
Dendroctonus jeffreyi is a bark beetle in the family Curculionidae, subfamily Scolytinae, endemic to western North America. The species is monophagous on Jeffrey pine (Pinus jeffreyi), feeding on phloem and causing significant tree mortality during outbreak conditions. Adults bore into bark to create egg chambers, with larvae developing in galleries under the bark. The beetle possesses specialized mycangia for transporting the symbiotic fungus Ophiostoma clavigerum, which contributes to tree mortality. Populations show genetic structure across their range, with southern California populations most differentiated.
Dendroctonus mexicanus
Mexican bark beetle
Dendroctonus mexicanus is a bark beetle native to Mexico and Central America, recognized as the most widely distributed and destructive bark beetle in Mexico. It colonizes more than 21 pine species and causes significant tree mortality in coniferous forests. The species' population dynamics are strongly influenced by climate variables, particularly temperature and precipitation, with outbreak risk increasing under warmer, drier conditions. It is considered a major forest pest affecting wood supply and ecosystem services.
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ponderosae
Mountain Pine Beetle
Dendroctonus ponderosae, commonly known as the mountain pine beetle, is a bark beetle native to western North America. It is a significant forest disturbance agent that attacks and kills pine trees, particularly during outbreak conditions. The beetle has a hard black exoskeleton and measures approximately 5 mm. Population success is heavily influenced by temperature, which drives phenology and adult emergence synchrony required for mass attacks on host trees. The species has been responsible for extensive tree mortality across millions of acres in the western United States and Canada.
Dendroctonus pseudotsugae
Douglas-fir beetle, Douglas fir beetle
The Douglas-fir beetle (Dendroctonus pseudotsugae) is a bark beetle native to western North America and a major pest of Douglas-fir (Pseudotsuga menziesii). Adults are small (4.4–7 mm), light brown when young, darkening to brown or black with reddish wing covers. Outbreaks typically follow disturbances such as storms, fire, or drought, which provide stressed or dead host trees. The species has one of the most thoroughly studied pheromone systems among bark beetles, with operational use of its antiaggregation pheromone (MCH) to protect high-value trees developed over 40 years of research. The beetle also infests downed western larch (Larix occidentalis), though brood do not survive in live larch due to high 3-carene content.
Dendroctonus rufipennis
spruce beetle, great spruce bark beetle
Dendroctonus rufipennis, the spruce beetle, is a bark beetle native to North America and a major pest of spruce forests. Adults measure 4–7 mm in length and are among the larger bark beetles in spruce. The species undergoes a facultative life cycle of 1, 2, or 3 years, with 2-year cycles being most common. Outbreaks have caused extensive tree mortality across western North America, particularly affecting Engelmann and white spruce. Climate warming and drought stress are key factors driving population increases.
Scolytinae
Bark and Ambrosia Beetles, Bark Beetles
Scolytinae is a subfamily of weevils (Curculionidae) comprising approximately 220 genera and 6,000 species commonly known as bark and ambrosia beetles. Members are characterized by their specialized association with woody plants, where they excavate galleries beneath bark for reproduction and larval development. The subfamily includes some of the most economically significant forest pests globally, such as the southern pine beetle (Dendroctonus frontalis) and mountain pine beetle (Dendroctonus ponderosae), which cause billions of dollars in timber losses. Species exhibit diverse feeding strategies: phloem-feeding bark beetles consume living or dying tree tissues, while ambrosia beetles cultivate symbiotic fungi in galleries as a food source.