Schizaphis graminum

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Schizaphis graminum (click on image to enlarge it)
Author(s): Kent Loeffler
Source: Wikimedia Commons

Schizaphis graminum (Rondani, 1852) - (greenbug)

The aphid is a pest of wheat, barley and other cereals in temperate and subtropical regions. In North America, populations can reach economic levels and require control. Grasses may be also infested. Damaged leaves are often characterized by necrotic tips. The aphid can transmit virus diseases like the Barley yellow dwarf viruses or the Cereal yellow dwarf viruses. Different biotypes have been described which differ in their preferred host plants and in their damage potential.

Females are commonly wingless and usually reproduce parthenogenetically by giving birth to live nymphs. These pass through 3 nymphal stages and can reach the adult stage in less than 2 weeks. There may be more than 10 generations per year. Under unsuitable conditions and during the last generation winged adults are produced. These can disperse over long distances with the help of air currents. In cooler regions, the winged females lay eggs which overwinter on grasses.

Vernacular names
• Deutsch: grüne Getreideblattlaus
• English: greenbug
• Español: pulgón verde de los cereales
• Français: puceron vert des graminées
• Português: pulgão-verde-do-sorgo

The adults are 1½-2 mm long, yellowish green with a darker green dorsal stripe. The antennae and tips of the cornicles are dark, almost black.

Synonyms:
Toxoptera graminum

For reviews see Royer et al., 2015 and BugwoodWiki.