Ireland

Rose - grain aphid

Metopolophium dirhodum

Identification: The adult apterae of Metopolophium dirhodum are medium-sized spindle-shaped aphids which range from green to yellowish green, with a brighter green longitudinal mid-dorsal stripe. The antennae are about 0.75 times the body length, and are mainly pale apart from the apices of segments III-V, and parts of segment 6 which are dusky or black. The siphunculi are long and pale, with slightly dusky tips. The cauda is pale. The body length of Metopolophium dirhodumapterae is 1.6-2.9 mm.

The rose - grain aphid host alternates from rose (Rosa sp) as the primary host in spring and early summer to cereals and grasses, especiallywheat, barley and maize, as the secondary host. In mild winters they may overwinter on grasses parthenogenetically. Large numbers on cereals can cause economic damage. Metopolophium dirhodum also transmit maize mosaic virus and barley yellow dwarf virus.