Tuberolachnus

Associated with woody host plants including willows (Salix spp.), poplars (Populus spp.), beech, oak, hickory, walnut, and apple (Malus domestica). Found on stems and branches of host trees, often forming dense colonies.

Widely distributed across temperate regions of the Northern Hemisphere including Europe, North America, and Asia. Invasive populations established in New Zealand (first reported 2013), Patagonia, and Kashmir, India. GBIF records indicate presence in Denmark, Norway, and Sweden.

In temperate regions, active from spring through autumn. In late autumn, colonies switch from viviparous reproduction to oviposition, laying overwintering eggs on branches. In New Zealand, observed on willows from late September to late November, then reappearing in late December and remaining until leaf fall.

Phloem feeder on woody plants. Uses long stylets to extract sap from host plant stems and branches.

• Salix spp. - primary hostwillows
• Populus spp. - hostpoplars
• Malus domestica - hostapple; recently documented invasive host in Kashmir, India and New Zealand
• Fagus spp. - hostbeech
• Quercus spp. - hostoak
• Carya spp. - hosthickory
• Juglans spp. - hostwalnut

Obligate parthenogenesis with no sexual generation known. Reproduces viviparously during the growing season, with females giving birth to live nymphs. In autumn, switches to oviposition, laying overwintering eggs that hatch the following spring. Alate (winged) and apterous (wingless) adults occur in colonies.

Forms dense colonies on host plant stems. Produces copious amounts of honeydew, which attracts ants and other insects. Ants frequently tend colonies in mutualistic relationships, protecting aphids from predators in exchange for honeydew.

Invasive pest with significant economic and ecological impacts. Heavy infestations cause host plant damage including yellowing leaves, stunted growth, reduced fruit production, and sooty mold growth from honeydew deposition. Honeydew production alters soil biota and biochemical properties, increasing microbial biomass, soil respiration, and mesofauna abundance. Supports elevated populations of invasive social wasps (Vespula spp.) through carbohydrate provision. Complex cascading effects involving multiple trophic levels.

Significant agricultural and apicultural pest. Infestations on apple trees reduce fruit production and tree vigor. Honeydew collected by honeybees causes honey crystallization in combs and affects bee health due to elevated melezitose content. Subject of biological control research including host specificity testing of parasitoid Pauesia nigrovaria and evaluation of harlequin ladybird beetle Harmonia axyridis as predators. Willow cultivars grown for bioenergy production are increasingly affected.

• Longistigma caryaeAlso a giant aphid in North America, similarly large-bodied and found on woody hosts including oak, hickory, and beech; distinguished by host preferences and morphological details
• Cinara spp.Large aphids on conifers and woody plants; Tuberolachnus distinguished by larger body size, obligate parthenogenesis, and specific host associations with willows and poplars
• Lachnus spp.Related aphids in subfamily Lachninae; Tuberolachnus distinguished by larger size, tuberculate body form, and parthenogenetic reproduction

• aphid
• invasive species
• parthenogenesis
• phloem feeder
• honeydew producer
• agricultural pest
• willow pest
• ant mutualism
• soil ecology
• apiculture problem

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• ‘Twas two weeks before Christmas – Giant bark aphids, Longistigma caryae and giant willow aphids, Tuberolachnus salignus — Bug of the Week
• ‘Twas the week before Christmas: Giant bark aphids, Longistigma caryae, and giant willow aphids, Tuberolachnus salignus — Bug of the Week
• ‘Twas the week before Christmas: Giant bark aphids, Longistigma caryae, and giant willow aphids, Tuberolachnus salignus — Bug of the Week
• Archive — Bug of the Week
• Studies On the Feeding and Nutrition of Tuberolachnus Salignus (Gmelin) (Homoptera, Aphididae)
• Population genetics of Tuberolachnus salignus , an obligate parthenogenetic aphid
• Tuberolachnus salignus (Gmelin, 1790) (Hemiptera, Aphididae) on Apple (Malus domestica Borkh) in Kashmir, India
• Studies On the Feeding and Nutrition ofTuberolachnus Salignus(Gmelin) (Homoptera, Aphididae)
• Honeydew Deposition by the Giant Willow Aphid (Tuberolachnus salignus) Affects Soil Biota and Soil Biochemical Properties
• Monitoring giant willow aphid (<i>Tuberolachnus salignus</i>) on apple trees in close proximity to infested willows
• Direct and Indirect Impacts of the Tuberolachnus salignus (Hemiptera: Aphididae) Invasion in New Zealand and Management Alternatives
• Seasonal abundance of Tuberolachnus salignus and its effect on flowering of host willows of varying susceptibility
• The potential of harlequin ladybird beetle Harmonia axyridis as a predator of the giant willow aphid Tuberolachnus salignus: voracity, life history and prey preference
• Effect of willow cultivar and plant age on the melezitose content of giant willow aphid ( Tuberolachnus salignus ) honeydew
• Host selection and performance of the giant willow aphid, Tuberolachnus salignus Gmelin – implications for pest management
• Host specificity testing of Pauesia nigrovaria (Hymenoptera: Braconidae: Aphidiinae) for classical biological control of Tuberolachnus salignus (Hemiptera: Aphididae: Lachninae) in New Zealand
• Honeydew production by the giant willow aphid (Tuberolachnus salignus, Hemiptera: Aphididae) and its effect on foraging yellowjackets (Hymenoptera: Vespidae)