Myzus persicae

(Sulzer, 1776)

green peach aphid, greenfly, peach-potato aphid

is a globally distributed pest with a alternating between primary woody (Prunus spp., especially peach) and secondary herbaceous hosts across 40 plant . The exhibits cyclical in most , with and -laying restricted to autumn on primary hosts. It is the most economically important aphid of plant viruses, capable of transmitting over 100 different viruses to crops including potato, tobacco, and brassicas. Some have lost sexual reproduction entirely, becoming obligate parthenogens that persist year-round on secondary hosts.

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Pronunciation

How to pronounce Myzus persicae: /ˈmaɪ.zəs ˈpɜr.sɪˌki/

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Identification

Distinguished from similar aphids by convergent inner of antennal when viewed dorsally, and slightly siphunculi approximately as long as the terminal antennal process. Differs from lettuce (Nasonovia ribisnigri) by the latter's lack of strongly converging antennal tubercles. Color is not diagnostic due to high plasticity influenced by plant and temperature.

Images

Appearance

Small , 1.8–2.1 mm in length. Wingless are yellowish-green to green, sometimes with medial and lateral green stripes; color can vary to red or brown depending on plant, nutrition, and temperature. Winged adults have a black and with yellowish-green bearing a large dark patch. Nymphs initially green, becoming yellowish; those producing winged females may be pinkish. elliptical, 0.6 × 0.3 mm, initially yellow or green, turning black. Cornicles (siphunculi) moderately long, unevenly swollen along length, matching body color with dark tips. Antennal with convergent inner in dorsal view. Siphunculi slightly , approximately as long as terminal antennal process.

Habitat

Primary : Prunus , particularly peach (Prunus persica), peach hybrids, apricot, and plum— as on these woody plants. Secondary hosts: herbaceous plants across 40 , especially actively growing tissue of vegetable crops in Solanaceae, Chenopodiaceae, Compositae, Brassicaceae, and Cucurbitaceae. Also common in greenhouses. Does not tolerate extreme temperatures or humidity; EUNIS classification includes lines of trees, small anthropogenic woodlands, early-stage woodland, and coppice.

Distribution

distribution worldwide; likely native to Asia-Temperate region. Established across Europe, Asia, Africa, Australasia, Pacific Islands, North America, Central America, West Indies, and South America. Introduced to at least 16 countries or islands. Long-distance spread primarily through anthropogenic transport of plant material rather than natural wind .

Seasonality

synchronized with plant . hatch on primary hosts in spring when plants break dormancy. Multiple parthenogenetic (over 20 annually in mild climates, 10–12 days per generation) occur through summer. Winged dispersants migrate to secondary hosts in early summer, with peak breeding damage occurring then. Return to primary hosts in autumn for and egg-laying. Some obligate parthenogen persist year-round on secondary hosts without seasonal interruption.

Diet

Phloem sap feeder using . Feeds preferentially on actively growing plant tissue and youngest plant parts. Has been observed to ingest chloroplast during long-term feeding without damaging chloroplasts. Produces honeydew excreta.

Host Associations

Prunus persica - primary ; site of and -laying
Prunus armeniaca - primary
Prunus domestica - primary
Solanum tuberosum - secondary Major crop ; virus
Nicotiana tabacum - secondary Major crop ; virus
Capsicum annuum - secondary Virus for pepper potyviruses and cucumber mosaic virus
Brassica oleracea - secondary Cruciferous vegetable
Cucumis sativus - secondary Cucurbit

Life Cycle

Cyclical : on primary hatch in spring to parthenogenetic females. Multiple produce live young (viviparity) on primary hosts, then winged forms disperse to secondary hosts. Parthenogenetic continues through summer. In autumn, decreasing day length and temperature induce sexual morphs; winged forms return to primary hosts where mating occurs and eggs are deposited. Generation time: 10–12 days at favorable temperatures. Females begin reproduction 6–17 days after birth (average 10.8 days), with reproductive period averaging 14.8 days and total lifespan approximately 23 days without . Some are obligate parthenogens that reproduce asexually year-round on secondary hosts.

Behavior

Exhibits negative to silver-grey surfaces, which can be exploited for physical control. Winged forms produced in response to crowding and plant quality deterioration, enabling between host plants. E-β-farnesene triggers dispersal and attracts natural enemies. Can be transported long distances by wind and storms, though long-distance is uncommon; spread primarily through human-mediated transport of infested plant material.

Ecological Role

Major for over 100 plant viruses including potato virus Y, potato leafroll virus, cucumber mosaic virus, and tobacco etch virus. Honeydew promotes growth on plants. Serves as host for numerous (e.g., Aphidius colemani), predatory insects, and fungal , forming important connections in agricultural .

Human Relevance

Among the most economically significant agricultural pests globally. Direct damage through feeding causes water stress, leaf curling, reduced growth, and yield loss in peach, potato, tobacco, and numerous vegetable crops. Indirect damage through virus transmission is often more severe, with potato leafroll virus causing 40–70% yield reductions. Extremely difficult to control due to broad range, rapid , development of resistance, and ability to transmit viruses to non-colonized crops. Subject to extensive research including , banker plant systems, and spray technologies.

Similar Taxa

Nasonovia ribisnigriLettuce ; distinguished by lack of strongly converging antennal and preference for lettuce tissue
Aphis gossypiiMelon aphid; similar greenhouse pest but with different antennal structure and preferences
Myzus persicae nicotianaeTobacco ; maintained primarily and specialized on tobacco

More Details

Genetic Variability

Highly variable with documented strains, races, and distinguished by , color, , -plant preference, virus transmission ability, and resistance. Karyotype normally 2n=12, but chromosomal rearrangements are common, including a widespread between 1 and 3 associated with and carbamate resistance. Some have 13 or fragmented autosomes.

Insecticide Resistance

Extremely to many ; resistance mechanisms include target-site mutations and metabolic detoxification. Chromosomal involving 1 and 3 correlate with resistance to and carbamate . Resistance management is a major challenge in agricultural control programs.