Ingo Arndt / Pea aphid (Acyrthosiphon pisum) giving birth (viviparous during the summer month), Germany. Winner of Fritz Polking portfolio prize, GDT 2012 competition.

Nigel Cattlin / Photomicrograph of Vetch aphid (Megoura viciae), large wingless female greenfly pest, on Broad bean (Vicia faba) leaf, UK.

Doug Wechsler / Hover fly (Syrphidae sp.) larvae feeding on aphids (Uroleucon sp.), Philadelphia, Pennsylvania, USA. June.

Doug Wechsler / Mealy plum aphids (Hyalopterus pruni) with parasitic mites, New Jersey, USA. June.

Doug Wechsler / Hover Fly (Syrphidae sp.) larvae feeding on aphid (Uroleucon sp.), Philadelphia, Pennsylvania, USA. June.

Nigel Cattlin / Barberry aphid (Liosomaphis berberidis) infestation on young shoots of Berberis (Berberis thunbergii var atropurpureum), Berkshire, UK, June.

Nigel Cattlin / Barberry aphid (Liosomaphis berberidis) infestation on young shoots of Berberis (Berberis thunbergii var atropurpureum), Berkshire, UK, June.

Nigel Cattlin / Barberry aphid (Liosomaphis berberidis) infestation on young shoots of Berberis (Berberis thunbergii var atropurpureum), Berkshire, UK, June.

Nigel Cattlin / Barberry aphid (Liosomaphis berberidis) infestation on young shoots of Berberis (Berberis thunbergii var atropurpureum), Berkshire, UK, June.

Nigel Cattlin / Barberry aphid (Liosomaphis berberidis) infestation on young shoots of Berberis (Berberis thunbergii var atropurpureum), Berkshire, UK, June.

Alex Hyde / Aphid (Aphididae) nymph walking along the edge of a Fly Agaric (Amanita muscaria). Aigas Field Centre, near Inverness, Scotland. October

Rolf Nussbaumer / Acrobat ant (Crematogaster sp) milking aphid. Hill Country, Texas, USA.

Rolf Nussbaumer / Green lacewing (Chrysoperla carnea) larva feeding on aphid. Hill Country, Texas, USA.

Nick Upton / Masked oxeye aphid (Macrosiphoniella subterranea) wingless adult and nymphs of this very rare species in the UK on an Oxeye daisy / Marguerite (Leucanthemum vulgare) leaf, RSPB Ham Wall, Somerset, UK,...

Nick Upton / Masked oxeye aphid (Macrosiphoniella subterranea) wingless adult of this very rare species in the UK with a newly born nymph on an Oxeye daisy / Marguerite (Leucanthemum vulgare) leaf, RSPB Ham Wall,...

Nick Upton / Common wasp (Vespula vulgaris) feeding on aphid honeydew, on bean leaf. Wiltshire, England, UK. July.

Nick Upton / Large knapweed aphid (Uroleucon jaceae) colony feeding on Greater knapweed (Centaurea scabiosa) stem, chalk grassland meadow, Wiltshire, UK, May.

Ingo Arndt / Honey bee (Apis mellifera), feeding on honeydew from aphids on a fir tree which they secrete as they feed on plant sap. Honey bees process it into a dark and strong 'forest honey', Germany.

Rod Williams / Giant willow aphid (Tuberolachnus salignus) on blade of grass. Sutcliffe Park Nature Reserve, Eltham, London, England, UK. July. Cropped image.

Nigel Cattlin / Grain aphid (Sitobion avenae) severe infestion of pest aphids on green unripe ears of winter wheat, England, UK. June

Nigel Cattlin / Grain aphid (Sitobion avenae) severe infestion of pest aphids on green unripe ears of winter wheat, England, UK. June

Nigel Cattlin / Pea aphid (Acyrthosiphon pisum) a severe aphid infestation on a pea crop but naturally heavily parasitized by Aphidius wasps

Nigel Cattlin / Pea aphid (Acyrthosiphon pisum) a severe aphid infestation on a pea crop but naturally heavily parasitized by Aphidius wasps

Nigel Cattlin / Pea aphid (Acyrthosiphon pisum) apterous adult female pest with long antennae on a pea leaf

Nigel Cattlin / Apple leaf curling aphid (Dysaphis devecta) and apple aphid (Aphis pomi) pests on a curled apple leaf

Nigel Cattlin / Colony of grain aphids (Sitobion avenae) of various wingless stages on the leaf oif a barley crop plant

Nigel Cattlin / Photomicrograph black cherry aphid or cherry blackfly (Myzus cerasi) infestation on wild cherry leaf, Berkshire, England, UK, May

Nigel Cattlin / Photomicrograph Black cherry aphid / Cherry blackfly (Myzus cerasi) infestation on wild cherry leaf, Berkshire, England, UK, May

Nigel Cattlin / Photomicrograph Black cherry aphid / Cherry blackfly (Myzus cerasi) infestation on wild cherry leaf, Berkshire, England, UK, May

Nigel Cattlin / Lupin aphids (Macrosiphum albifrons) leaf and stem infestation on a tree lupin (Lupinus arboreus) in flower, Berkshire, England, UK, May

Nigel Cattlin / Lupin aphids (Macrosiphum albifrons) leaf and stem infestation on a tree lupin (Lupinus arboreus) in flower, Berkshire, England, UK, May

Rod Williams / Common sycamore aphid. (Drepanosiphum platanoidis). Beverley Court Gardens, Lewisham. London, England, May. Cropped

Doug Wechsler / Aphid (Oestlundiella flava) on white alder, with nymph, Washington State, USA, August.

Doug Wechsler / Aphid (Uroleucon sp), Philadelphia, Pennsylvania, USA, August.

Doug Wechsler / Aphid (Uroleucon sp) giving birth, Philadelphia, Pennsylvania, USA, August.

Doug Wechsler / Tulip tree aphid (Illinoia liriodendri) with nymphs, Phliadelphia, Pennsylvania, USA, May.

Nigel Cattlin / Rose aphid (Macrosiphum rosae) infestation on a Rose (Rosa spp), bud, Berkshire, England, UK, June

Nigel Cattlin / Grain aphids (Sitobion avenae) green and pale brown plant sucking pests on a wheat crop leaf

Nigel Cattlin / Elder aphid (Aphis sambuci) infestation on the young shoot of ornamental Elder (Sambucus sp) in garden. Berkshire, England, UK. April.

Nigel Cattlin / Lupin aphid (Macrosiphum albifrons) infestation on stem and apical shoots of young Tree lupin (Lupinus arboreus). Berkshire, England, UK. May.

Nigel Cattlin / Glasshouse-potato aphid (Aulacorthum solani) colony on Hibiscus (Hibiscus sp) flower bud, house plant.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on Brassica stem. Berkshire, England, UK. June.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on Brassica stem. Berkshire, England, UK. June.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on secondary host plant Hedge mustard (Alliaria petiolata). Berkshire, England, UK. June.

Nigel Cattlin / Potato aphid (Macrosiphum euphorbiae) infestation on Tulip (Tulipa sp) petal. Berkshire, England, UK. May.

Nigel Cattlin / Foxglove aphid (Aulacorthum solani) infestation on Bougainvillea (Bougainvillea sp) flower in conservatory, UK. August.

Nigel Cattlin / Seven-spot ladybird (Coccinella septum-punctata) larva predating Black bean aphids (Aphis fabae) on Runner bean (Phaseolus coccineus). Bean with buds. Berkshire, England, UK. July.

Nigel Cattlin / Black bean aphid (Aphis fabae) infestation on Runner bean (Phaseolus coccineus), stem twining up bamboo cane. Berkshire, England, UK. June.