Nettle leaf galls

Nettle leaf galls

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Caption: Nettle leaf galls, artwork. Four views of galls at the base of a stinging nettle leaf (Urtica dioica). These abnormal outgrowths are caused by the parasitic larvae of the nettle gall midge (Dasineura urticae). The larvae emit a chemical which stimulates growth and then they feed on the juices and tissue produced inside the gall cavity. A slit in the top of the gall provides an exit point. Each gall generally contains one larva. A gall may contain more than one larva (as shown in the cross-section, bottom right), indicating that the gall midge larva itself has become a victim of a endoparasitoid.

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Keywords: abnormal, abnormality, artwork, biological, biology, botanical, botany, cross-section, damage, damaged, dasineura urticae, developing, development, diagram, disease, diseases, drawing, endoparasitoid, entomology, four, gall, galls, growth, illustration, insect, larva, larvae, leaf, life cycle, nature, nettle gall midge, parasite, parasitic, parasitism, pathogens, pathology, plant, quartet, stinging nettle, urtica dioica, zoological, zoology

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