Green peach aphid

Definition

A small, soft-bodied aphid species, Myzus persicae (Hemiptera: Aphididae), ranging from yellow-green to reddish in color and possessing cornicles on the abdomen. It is a polyphagous pest of global economic importance, feeding on phloem sap from over 400 host plant species across more than 50 families, with particular damage to peach (Prunus persica), potato (Solanum tuberosum), and tobacco (Nicotiana tabacum). The species exhibits complex life cycles involving both sexual and parthenogenetic reproduction, alternates between primary (peach) and secondary (herbaceous) hosts, and serves as a principal vector for more than 100 plant viruses including Potato virus Y and Cucumber mosaic virus.

Etymology

From the characteristic green coloration and its status as the primary pest of peach trees; scientific name Myzus persicae derives from Greek myzos (sucking) and Latin persica (peach).

Example

In integrated pest management programs, monitoring alate (winged) green peach aphid immigration into potato fields using yellow water pan traps allows growers to time insecticide applications before virus transmission thresholds are reached.

Synonyms

• Myzus persicae
• peach-potato aphid
• greenfly

Related Terms

• Aphididae
• cornicle
• Parthenogenesis
• host alternation
• Vector
• Potato virus Y
• Alate
• stylet

Usage Notes

The common name "greenfly" is ambiguous and shared with other aphid species; "peach-potato aphid" emphasizes its economic hosts but is less common in North American literature. Color morphs vary with temperature and host plant—summer populations on potato are typically pale green, while autumn forms on peach may be pink or red. The species is frequently used as a model organism in studies of insecticide resistance evolution, having developed resistance to more than 70 different chemical classes.