Propylea quatuordecimpunctata

Linnaeus, 1758

14-spotted ladybird beetle, Fourteen-spotted Lady Beetle, P-14

A small (3.5–4.5 mm) to the Palearctic and to North America as a agent for . Exhibits remarkable color with over 100 documented pattern variations, ranging from cream- to nearly black. A of aphids and other soft-bodied , with demonstrated capacity in North America.

Propylea quatuordecimpunctata by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Propylea quatuordecimpunctata 122335558 by ruebezahl. Used under a CC0 license.

Propylea quatuordecimpunctata 118246734 by Gunner Kjerulf Poulsen. Used under a CC0 license.

Pronunciation

How to pronounce Propylea quatuordecimpunctata: /prɒˈpɪliə kwætwɔːdˌsɛmˈpʌŋkˌteɪtə/

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Identification

Distinguished from other by the combination of small size (3.5–4.5 mm), -cream to orange background (never red), and 14 black rectangular spots on that frequently fuse into anchor-shaped markings. pattern of 4–8 black spots on pale background separates it from similar-sized . Differs from Coccinella septempunctata (7-spot) by spot number and color; from Harmonia axyridis by smaller size and absence of red coloration; from Adalia bipunctata by spot arrangement and pronotum pattern.

Images

Appearance

Body length 3.5–4.5 mm. Background coloration ranges from cream through to light orange, never red. bear 14 black, almost rectangular spots, though these rarely remain separate; spots commonly fuse into larger markings, particularly along the midline where they often form an anchor-shaped pattern. Extreme fusion can render the body nearly black with 12 pale yellow spots. whitish or pale yellow with 4–8 black spots. and legs yellowish-.

Habitat

Occurs from lowlands to subalpine zones. Found in and mixed forests, meadows, fields, gardens, parks, and agricultural settings. Utilizes diverse microhabitats: grasses, herbaceous plants, bushes, trees, forest litter, brushwood, coarse woody debris, moss, straw, detritus, alluvial soil, rotten residues, and compost. In agricultural contexts, occurs in -free and treated potato fields, and other -infested .

Distribution

: Palearctic from Circle southward—widespread across Europe, North Africa, Cyprus, European Russia, Caucasus, Siberia, Russian Far East, Belarus, Ukraine, Moldova, Transcaucasia, Kazakhstan, Western Asia, Pakistan, Mongolia, temperate China, Korea, and Japan. : North America (southeastern Canada to Great Lakes and Florida), established and spreading. One of the most abundant in Bulgaria.

Diet

. Preys on (, Aphis craccivora, Eucallipterus tiliae, Euceraphis betulae, Phorodon humuli, ), (), (), and and of some and . All six tested aphid support complete larval development and weight gain.

Host Associations

Acyrthosiphon pisum - suitable food for larval development
Aphis craccivora - suitable food, though lower than diets
Eucallipterus tiliae - suitable food for larval development
Euceraphis betulae - suitable food for larval development
Phorodon humuli - suitable food for larval development
Myzus persicae - supports higher than Aphis craccivora alone
Brassica oleracea var. capitata - cabbage, site of studies

Life Cycle

Females lay approximately 400 . Larval development rate and mortality vary with . overwinter twice. : egg, , , adult.

Behavior

Females select sites based on surface properties: prefer hydrophilic surfaces and smooth substrates over rough ones, as perform better on smooth surfaces. glue adapts to replicate surface features of artificial and natural substrates across varied asperity sizes, except very high asperity or large . This surface-selective differs from Harmonia axyridis, which shows no roughness preference.

Ecological Role

Predatory ; significant agent in natural and agricultural . One of the most abundant in parts of its range. Effectiveness in depends on food specificity and availability. Less susceptible than some to certain , though direct exposure to some products (soap, orange ) causes larval mortality.

Human Relevance

to North America intentionally as a agent for . Used in programs in agricultural settings. Subject of mass rearing research to improve -laying substrate design. Susceptibility to varies by product, requiring case-by-case evaluation for compatibility.

Similar Taxa

Harmonia axyridisSimilar size and habit, but larger, often red or orange with variable spot number, and lacks surface roughness preference in site selection.
Coccinella septempunctata Palearctic also to North America, but larger (7–8 mm), with red and seven spots, and red with black markings.
Adalia bipunctataSmall with two spots and red or black color forms; differs in pattern and spot arrangement.

More Details

Color polymorphism

Over 100 documented color and pattern varieties exist, historically causing taxonomic confusion with some forms described as separate . Named varieties include var. suturalis, var. weisei, var. pedemontana, var. frivaldskyi, var. pannonica, var. moravica, and var. perlata.

Reproductive plasticity

Females show substantial variation in reproductive timing: 56–83% initiate within 2 weeks of life, while others have extended preoviposition periods or remain non-reproductive through 60-day observation periods. Repeatability of daily parity varies geographically (0.25–0.35 across France, Turkey, and Canada ).