Myzus persicae

Definition

A globally distributed aphid species (Hemiptera: Aphididae) commonly known as the green peach aphid or peach-potato aphid. A small, soft-bodied phloem-feeder typically pale green in color, it exhibits extreme polyphagy across dozens of plant families and alternate generations between Prunus spp. (primary host, overwintering as eggs) and herbaceous crops (secondary hosts). Economically significant as both a direct pest—causing leaf curl, stunting, and honeydew deposition on peach, potato, tobacco, and brassicas—and as a major vector of plant viruses including potato virus Y (PVY), cucumber mosaic virus (CMV), and tobacco etch virus (TEV). Populations reproduce parthenogenetically through much of the growing season, with alate (winged) morphs produced under crowding or host decline to disperse to new plants.

Etymology

Myzus from Greek myzein (to suck); persicae from Latin persica (peach), referencing its primary host association.

Example

In integrated pest management programs for seed potatoes, M. persicae is monitored using yellow water-pan traps to time insecticide applications before aphid densities reach the threshold for PVY transmission.

Synonyms

• Green peach aphid
• peach-potato aphid
• greenfly

Related Terms

• Aphididae
• Hemiptera
• Alate
• Parthenogenesis
• host alternation
• plant virus vector
• stylet
• honeydew
• IPM
• Prunus

Usage Notes

The name 'greenfly' is generic and applies to many green aphids; 'green peach aphid' is preferred in agricultural contexts. Subspecies (e.g., M. p. nicotianae) are recognized based on host race and karyotype differences. The species is frequently used as a model organism in insecticide resistance research, with populations worldwide carrying metabolic (carboxylesterase, cytochrome P450) and target-site (kdr, MACE) resistance mechanisms.