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The rose-grain aphid (Metopolophium dirhodum Walker) and green spruce aphid (Elatobium abietinum Walker) were both accidentally introduced into New Zealand. The former colonises barley predominantly, while the latter feeds on spruces (Picea spp.). RAPD-PCR DNA methods were used to determine the genetic diversity within each species. The genetic variation detected in New Zealand and UK populations was significantly lower for the green spruce aphid than for the rose-grain aphid. In New Zealand, this could be caused by fewer introductions and restricted host-plant availability for the green spruce aphid.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Genetic diversity of two introduced aphid species in New Zealand