Apolygus lucorum

(Meyer-Dür, 1843)

Apolygus lucorum is a trans-Palearctic mirid bug with a broad distribution across Europe and Asia. It is a pest with significant economic impact on cotton and other crops in northern China, where it has become increasingly problematic following changes in agricultural practices. The exhibits phytozoophagous feeding , consuming both plant sap and small prey. are small, yellowish-green, and active from summer through autumn.

20170722 Apolygus lucorum Lohja Finland Petro Pynnönen by Petro Pynnönen. Used under a CC BY-SA 4.0 license.

Apolygus lucorum (2008-06-13) by Entomart. Used under a Attribution license.

Apolygus lucorum 1 by Sandy Rae. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Apolygus lucorum: //əˈpɒlɪɡəs luˈkɔːrəm//

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

Identification

can be distinguished from the similar Apolygus spinolae by morphological examination, though the two are extremely similar in appearance. Molecular identification using the nuclear marker ITS1 is the most reliable method for species delimitation; the COI barcoding region is not suitable for distinguishing these species. A. lucorum can be separated from other Apolygus species by a combination of genitalic and molecular characters.

Images

Appearance

measure 5–6 mm in length. Body coloration is yellowish-green. in size and predatory capacity has been documented, with females showing higher theoretical maximum rates on certain prey .

Habitat

Agricultural landscapes, particularly cotton fields in northern China where it is a major pest. Found in diverse crop systems including fruit orchards, maize fields, vegetable plantings, soybean, peanut, and weedy vegetation. seek out flowering plants for feeding and oviposition. occurs in dead branches of trees and shrubs.

Distribution

Trans-Palearctic distribution. Present throughout Europe except Albania, Bulgaria, Iceland, Malta, and Portugal. Extends eastward across the Palearctic to China, Japan, and Russia (including Siberia, Sakhalin, and Kurile Islands). In China, particularly abundant in northern cotton-growing regions including Hebei and surrounding provinces.

Seasonality

are present from July to October in Europe. In northern China, five occur annually: first two generations on fruit trees and weeds (April–May), to cotton in mid-to-late June, third and fourth generations on cotton and other crops (July–August), and fifth generation returning to fruit trees and weeds to overwinter.

Diet

and phytozoophagous. Feeds on plant sap from more than 200 plant including cotton, maize, fruit trees, jujube (Ziziphus jujuba), vegetables, soybean, peanut, mugwort, tansy, nettle, Eupatorium, foxglove, thistle (Cirsium), and willowherb (Epilobium). Also preys on small arthropods including of Helicoverpa armigera, nymphs of Aphis gossypii, and nymphs of Bemisia tabaci. Predatory capacity follows a Holling type II , with maximum rates varying by prey species and mirid developmental stage.

Host Associations

cotton - primary /pestmajor crop pest in northern China
Ziziphus jujuba - main in some regions; jujube defense involves jasmonic acid
maize - positive effect on abundance, especially in August
fruit trees - and early-season first two and site
soybean - positively associated with cotton field abundance
peanut - positively associated with cotton field abundance
vegetables - positively associated with cotton field abundance
mugwort - preferred particularly favored feeding plant
Helicoverpa armigera - prey consumed
Aphis gossypii - preynymphs consumed; confirmed by molecular diagnostics in field
Bemisia tabaci - preynymphs consumed

Life Cycle

Hemimetabolous development with five per year in northern China. are laid in dead tree branches where they overwinter. Nymphs develop through five instars. First and second generations develop on fruit trees and weedy plants. Second-generation disperse to cotton and other crops in mid-to-late June. Third and fourth generations occur on cotton and alternative hosts during peak summer. Fifth-generation adults return to fruit trees and weeds to lay eggs. Developmental stage affects predatory capacity, with fourth-instar nymphs and adults showing higher rates than younger nymphs.

Behavior

exhibit high ability and seasonal between plants. Strong attraction to flowering plants for feeding and oviposition, as flowers provide essential resources for both nymphs and adults. Olfactory orientation to host plants involves detection of tetradecane and other volatile compounds. components include 4-oxo-(E)-2-hexenal and trans-2-hexenyl butyrate. Predatory is facultative and stage-dependent, with Holling type II to prey . Experiences limited natural enemy pressure in cotton fields.

Ecological Role

Agricultural pest causing serious damage to cotton, fruit, and vegetable crops through . Acts as a facultative of other pest arthropods including aphids, whiteflies, and lepidopteran , though this does not offset its pest status. Functions as a sink in cotton fields due to -induced mortality. Contributes to complexity in agricultural through its dual feeding strategy. Gene expansions related to digestion, chemosensory perception, and detoxification contribute to its environmental adaptability and pest severity.

Human Relevance

Major economic pest of cotton in northern China, with increasing severity following reduction of broad-spectrum use in Bt cotton and landscape- changes in cropping systems. Causes substantial yield losses in cotton, jujube, and other crops. Subject to research including trapping and landscape-level management strategies. First mirid with a published -scale reference , providing resources for understanding mesophyll feeding mechanisms and developing control technologies. Not suitable as a agent due to its predominantly phytophagous nature and documented pest status.

Similar Taxa

Apolygus spinolaeExtremely similar ; previously confused . Distinguished reliably only by nuclear ITS1 marker; COI barcoding insufficient. A. lucorum and A. spinolae are now treated as distinct based on integrative morphological and molecular analysis, though some former species (A. malaisei, A. nigronasutus, A. nigrovirens) have been synonymized with A. spinolae rather than A. lucorum.
Adelphocoris suturalisCo-occurring mirid pest in Chinese agriculture with similar range and damage profile; both respond to tetradecane as an olfactory cue.

More Details

Genomic resources

First - reference assembled for any Miridae : 1.02 Gb genome with 17 chromosomes. Contains expanded gene related to omnivory, chemosensation, and detoxification. Salivary polygalacturonase uniquely expanded, potentially contributing to leaf damage capacity.

Landscape ecology

abundance in cotton is negatively correlated with cotton acreage (dilution/trap-kill effect) and positively associated with surrounding vegetable, soybean, peanut, and maize plantings. Resource continuity across spatial and temporal drives regional .

Chemical ecology

Tetradecane is a key volatile compound mediating plant location, with female A. lucorum showing particularly strong attraction. trapping used for monitoring and research.