Myzus

Passerini, 1860

Species Guides

Myzus cerasi(black cherry aphid)
Myzus lythri(loosestrife aphid)
Myzus persicae(green peach aphid)

Myzus is a of aphids in the Aphididae with distribution, originally native to the Old World. The genus contains economically significant pest , most notably Myzus persicae (green peach aphid), which is a major of plant viruses affecting crops worldwide. Species in this genus exhibit complex involving alternation between primary woody hosts and secondary herbaceous hosts. Several Myzus species have been extensively studied for their role in agricultural pest management and virus transmission.

Myzus by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Myzus persicae by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Pronunciation

How to pronounce Myzus: /ˈmaɪzəs/

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Identification

Myzus are small, soft-bodied aphids typically 1-3 mm in length. They possess the characteristic features of pear-shaped bodies, long , and cornicles (siphunculi) on the . Species-level identification within Myzus requires examination of morphological details including the shape and length of the siphunculi, the presence and structure of abdominal , and antennal segment proportions. Myzus persicae can be distinguished from similar aphids by its relatively long siphunculi and the presence of a small tubercle on the . Winged forms (alatae) have dark abdominal markings that vary between species.

Images

Habitat

within Myzus occupy diverse corresponding to their plant associations. Primary hosts are typically woody plants in the Prunus (peach, plum, apricot), while secondary hosts span numerous herbaceous plant . The green peach aphid (Myzus persicae) has been documented on over 800 plant species across multiple families. Agricultural settings, orchards, greenhouses, and natural vegetation supporting host plants all provide suitable habitat. The peach-clematis (Myzus varians) alternates between Prunus species and Clematis vines.

Distribution

distribution with original range in the Old World. Documented occurrence includes Europe, Asia, Africa, North America, South America, and Australia. Distribution records from GBIF confirm presence in Denmark, Norway, and Sweden. Specific show varying distributions: Myzus persicae is globally distributed, Myzus mumecola is associated with apricot and Prunus mume in regions where these occur, and Myzus varians occurs in temperate regions where both Prunus and Clematis hosts are present.

Seasonality

Activity patterns vary by and climate. In temperate regions, and -laying occur in autumn, with eggs on primary woody . Spring triggers to secondary hosts where multiple parthenogenetic occur through summer. In mild climates or protected environments such as greenhouses, parthenogenetic may continue year-round without a egg stage. The peach-clematis has been observed active from spring through late autumn in Maryland, with potential winter activity during warm periods associated with climate change.

Diet

Phloem sap from plants. All are obligate phloem feeders using to extract plant fluids. Specific host associations vary by species: Myzus persicae is highly , feeding on hundreds of plant species across dozens of ; Myzus mumecola specializes on Prunus armeniaca (apricot) and Prunus mume; Myzus varians alternates between Prunus species and Clematis terniflora.

Host Associations

Prunus - primary Woody for -laying and ; includes peach, plum, apricot
Prunus armeniaca - primary Specific for Myzus mumecola
Prunus mume - primary Specific for Myzus mumecola
Clematis terniflora - secondary for Myzus varians during parthenogenetic
Solanum melongena - secondary Eggplant; for Myzus persicae
Capsicum - secondary Pepper; for Myzus persicae, important in virus transmission context
Brassica - secondary Cabbage and relatives; for Myzus persicae

Life Cycle

Complex involving alternation (heteroecy) and multiple reproductive modes. The typical cycle begins with on primary woody hosts (Prunus ). In spring, eggs hatch into stem mothers (fundatrices) that reproduce parthenogenetically, producing winged migrants (alatae) that disperse to secondary herbaceous hosts. On secondary hosts, multiple of parthenogenetic females (virginoparae) reproduce viviparously, with embryos developing inside the mother and born live. Some species exhibit telescoping of generations, where females carry embryos of their grandchildren. In autumn, decreasing and temperature trigger production of winged sexual forms (males and oviparae) that return to primary hosts to mate and produce overwintering eggs. In mild climates or greenhouses, the sexual phase may be skipped entirely, with continuous parthenogenetic .

Behavior

Parthenogenetic females exhibit rapid increase through . Winged forms display triggered by crowding, plant quality decline, or seasonal cues. Aphids produce honeydew, a sugar-rich that attracts ants and supports growth. When disturbed by or , aphids may drop from plants. release triggers escape responses in colony members. The green peach aphid shows extreme resistance and has been documented to transmit plant viruses in a non-persistent manner, acquiring and transmitting virus particles on mouthparts within seconds of feeding.

Ecological Role

Herbivores that transfer plant nutrients into through honeydew production, supporting , , and decomposers. Serve as prey for numerous natural enemies including lady beetles (Harmonia axyridis), lacewings, syrphid flies, and parasitoid (Aphidius colemani). Act as for approximately 50% of insect-borne plant viruses, including alfalfa mosaic virus, cucumber mosaic virus, and potato virus Y. Virus transmission occurs through non-persistent (stylet-borne) mechanism, making them significant agricultural pests even at low densities.

Human Relevance

Major agricultural pests causing direct damage through feeding and indirect damage through virus transmission. Myzus persicae is one of the most economically important globally, affecting vegetable, fruit, and ornamental crops. Management relies on strategies including crop varieties, with and , banker plant systems, and selective use. The was studied extensively by aphid taxonomist Edith Patch, whose work on aphid and relationships established foundational knowledge for management. Research on Myzus species continues to inform development of novel control methods including sweet-taste inhibitors and interference technologies.

Similar Taxa

AphisBoth are with similar ; Myzus typically has longer siphunculi and different antennal structure
RhopalosiphumSimilar size and range; Myzus often distinguished by more pronounced antennal and different cornicle shape
MacrosiphumBoth in tribe Macrosiphini; Myzus generally smaller with relatively longer siphunculi compared to body size

More Details

Chromosomal variability

Myzus persicae exhibits unusual karyotypic instability, with showing chromosomal fragmentations and rearrangements even within the same individual. This chromosomal plasticity is atypical for insects and may contribute to the ' adaptability.

Historical research significance

The Myzus was central to the research of Edith Patch, first female president of the Entomological Society of America, who conducted pioneering studies on at the University of Maine and Rothamsted Experimental Station.