Drought-stress

Guides

• Orthotomicus

  Orthotomicus is a genus of bark beetles in the family Curculionidae, subfamily Scolytinae, containing approximately nine described species. The genus is primarily associated with coniferous trees, particularly pines (Pinus spp.) and cedars (Cedrus spp.). Several species, notably Orthotomicus erosus (Mediterranean pine engraver) and O. laricis, have become significant forest pests through native population outbreaks and invasive range expansions. Species in this genus are known for their associations with ophiostomatoid fungi, which they vector and which contribute to tree decline.

  bark-beetleScolytinaepine-pestforest-entomologyinvasive-speciesophiostomatoid-fungivectorconiferMediterraneanCroatiaTurkeySouth-AmericaSouth-Africapheromoneclimate-changedrought-stressblue-stain-fungus

• Phloeosinus punctatus

  western cedar bark beetle

  Phloeosinus punctatus is a bark beetle in the family Curculionidae, subfamily Scolytinae, known as the western cedar bark beetle. The species colonizes giant sequoia (Sequoiadendron giganteum) and California incense-cedar (Calocedrus decurrens) in the Sierra Nevada mountains of California. Females initiate gallery construction and mate monogamously. The beetle undergoes four larval instars, typically producing one generation per year under natural conditions. It has been observed to contribute to branch mortality in giant sequoia, particularly when trees are under environmental stress.

  bark-beetleScolytinaegiant-sequoiaCupressaceaeSierra-NevadaCalifornia-endemicforest-pestmonogamous-matinghost-preferencecryptic-speciationbranch-mortalitydrought-stressclimate-change-vulnerability

• Tetramesa

  Tetramesa is a genus of minute phytophagous wasps in the family Eurytomidae comprising over 200 described species. Members are exclusively associated with grasses (Poaceae), where they typically induce stem or inflorescence galls. The genus exhibits pronounced host specificity, with most species restricted to a single grass species or closely related congeners. Several species have been deployed as biological control agents against invasive grasses, including T. romana for giant reed (Arundo donax) and candidate agents for medusahead (Taeniatherum caput-medusae) and African lovegrass (Eragrostis curvula). Adults feed on nectar. Recent phylogenomic studies have synonymized the genera Aiolomorphus and Cathilaria within Tetramesa.

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