Perillus

Stål, 1862

predatory stink bugs

Perillus is a of in the , to North America. The genus contains approximately seven described , with Perillus bioculatus () being the most extensively studied due to its use as a agent against the . Members of this genus are characterized by their predatory habits, using to immobilize with toxic before liquefying and consuming tissues. Several species have been to Europe and Asia for purposes, with P. bioculatus establishing expanding in southeastern Europe.

Perillus by (c) Toby, some rights reserved (CC BY), uploaded by Toby. Used under a CC-BY license.

Perillus by (c) Dan MacNeal, some rights reserved (CC BY), uploaded by Dan MacNeal. Used under a CC-BY license.

Perillus bioculatus by (c) katunchik, some rights reserved (CC BY), uploaded by katunchik. Used under a CC-BY license.

Pronunciation

How to pronounce Perillus: /pɛˈrɪl.lʊs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Habitat

Agricultural fields, particularly potato plantations; gardens with Solanaceae ; arid cold steppes and temperate zones with no dry season; ragweed stands. In Europe, established occupy foothill areas of the Carpathians and Eastern Alps, with potential for expansion into northern pre-alpine Italy, southern France, and the northeastern Iberian Peninsula.

Distribution

to North America. and established in Europe: Bulgaria, Greece, Hungary (first detected October 2023, nationwide establishment by June 2024), Moldavia, Romania, Serbia, Russia, Ukraine, and Türkiye. Expanding north-northwest from southeastern European . Predicted suitable includes southeastern Europe with potential expansion into Carpathian foothills, Eastern Alps, northern Italy, southern France, and northeastern Iberian Peninsula.

Seasonality

under favorable climatic conditions; activity period sensitive to temperature extremes affecting nymphal development and formation; enter facultative reproductive diapause under short-day conditions.

Diet

Specialized of () , , and ; exhibits dietary drift to alternative including turnip (Agrotis segetum), ragweed (Zygogramma suturalis), olive-shaded bird-dropping moth (Tarachidia candefacta), Chrysomela populi, Chrysolina herbacea, Ophraella communa, and Galeruca tanaceti larvae.

Host Associations

Solanum tuberosum - prey_locationPotato plants serve as foraging ; damaged plants release volatile sesquiterpenoids that attract
Ambrosia artemisiifolia - prey_locationRagweed stands support alternative

Life Cycle

development with , five nymphal , and stages; all active stages are predatory; females lay 100-1000 eggs; facultative reproductive in adults triggered by short ; preoviposition period varies with and photoperiod.

Behavior

Active hunter using olfactory cues to locate ; detects volatile compounds released by -damaged plants as foraging beacons; attack involves gentle insertion of to inject paralytic and digestive , liquefying prey tissues for consumption; simultaneous mating and observed; strong tendency to aggregate; influenced by temperature, , physiological age, and .

Ecological Role

agent of agricultural pests; relative abundance of 5-15 individuals/m² can eliminate need for in potato fields; on and may impact insect in newly colonized areas; facilitates naturalization through dietary flexibility.

Human Relevance

Intentionally to multiple countries for of ; mass release programs attempted from 1930s-1970s in France, Czechoslovakia, Hungary, Italy, Poland, USSR, and Yugoslavia; recent citizen science campaigns document expanding European ; rearing on artificial diets developed for commercial production.

Similar Taxa

Podisus maculiventris shares predatory habit, , and use as agent; distinguished by prominent on and broader range including and other soft-bodied
Euthyrhynchus floridanusFlorida shares bright coloration and predatory ; distinguished by more body and different geographic distribution
Arilus cristatusWheel shares predatory habit and piercing-sucking feeding mechanism; distinguished by distinctive wheel-like crest and ()

More Details

Olfactory Foraging Mechanism

Research by Weissbecker et al. demonstrated that Perillus bioculatus detects volatile sesquiterpenoids released by potato plants damaged by feeding, using these chemical cues to locate in agricultural fields.

Photoperiod-Diapause Relationship

Critical for 50% varies with : 15L:9D for females feeding on large versus 14.5L:9.5D for those feeding on and small larvae, indicating prey quality influences strategy.

European Introduction History

Multiple introduction attempts from 1930s-1970s were initially considered unsuccessful; small self-sustaining persisted undetected in Balkans and Türkiye until recent decades when range expansion accelerated, likely facilitated by climate change and dietary flexibility.