Psallus ambiguus
This record describes Psallus ambiguus (species). Recorded family: Miridae. Recorded order: Hemiptera.
Identification and Appearance

Length about 4 to 5 mm. The Psallus group includes many small bugs (< 6 mm) which are often mottled red, grey or dark brown. The pronotum and forewings are covered in scale like pale hairs and the tibial spines arise from black spots. Species identification of Psallus based on external features is often difficult and frequently impossible. Identification is complex and ideally requires microscopic examination. P. ambiguus can be identified by its relatively large size and the antennal colouration The 1st antennal segment is black and the 3rd segment pale. The 2nd segment is black in males, but partly pale over the basal half in females. If we cannot be certain of the identity of an image but it is likely to be this species, it is highlighted in a red box. Detailed examination of the specimen is needed to identify the species. Deciduous trees including apple, hawthorn, sallows and alder. The adults and larvae feed on small insects as well as the host trees. Widely scattered (British Heteroptera checklist (2021) - https://www.britishbugs.org.uk/systematic_het.html No additional images available for this species.
Classification
Habitat and Range
Habitat
Deciduous trees including apple, hawthorn, sallows and alder.
Seasonal Activity
May to August.
Diet and Behavior
Life History
The adults and larvae feed on small insects as well as the host trees.
Additional species information
Recorded status
Widely scattered (British Heteroptera checklist (2021) -
About True Bugs, Cicadas, Hoppers, Aphids and Allies: the wider group
Order-level background for Hemiptera, the group containing Psallus ambiguus. Species-specific details appear above.
Group overview
Hemiptera (true bugs) includes over 80,000 described species across cicadas, aphids, leafhoppers, shield bugs, and bed bugs. Aphids alone cost global agriculture an estimated $2.5 billion annually in crop losses.
Ecological role of the group
Many Hemiptera are essential food sources for birds and predatory insects. Cicadas provide massive nutrient pulses during emergence events - a single Brood X emergence can involve trillions of individuals across 15 states.
Economic and practical significance of the group
The brown marmorated stink bug (Halyomorpha halys) caused $37 million in apple crop losses in a single year in the U.S. Mid-Atlantic region. Bed bug infestations in the U.S. increased by 500% between 2001-2010, costing the hotel industry hundreds of millions annually.
Recorded sources for this group: USDA, EPA, University research. Imported estimates may describe particular regions or reporting periods.
Photos of Psallus ambiguus (10)
Frequently Asked Questions About Psallus ambiguus
What is Psallus ambiguus?
Psallus ambiguus is a species in the family Miridae, within the order Hemiptera.
How big is Psallus ambiguus?
about 4 to 5 mm. The
How do you identify Psallus ambiguus?
is complex and ideally requires microscopic examination.
Where is Psallus ambiguus found?
Habitat: Deciduous trees including apple, hawthorn, sallows and alder.
When is Psallus ambiguus active?
Psallus ambiguus: seasonal activity - May to August..
What is the life cycle of a Psallus ambiguus?
The adults and larvae feed on small insects as well as the host trees.
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