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Pemphigus betae
''Pemphigus betae'', also known as the sugarbeet root aphid, is a species of gall-forming aphid that forms galls specifically on the commonly found Narrowleaf Cottonwood (aka the Willow-leaved Poplar tree), ''Populus angustifolia''.
Sugarbeet root aphids have been found in North America and Europe.〔 They infect sugarbeets, but also other plants like tablebeets and Swiss chard.〔(【引用サイトリンク】url=http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex726 )〕 Their size has been likened to that of a pinhead, and are pale white-yellow in color.〔(【引用サイトリンク】url=http://pnwhandbooks.org/insect/agronomic/sugar-beet/sugar-beet-sugar-beet-root-aphid )〕 Sugarbeet root aphids have soft bodies that are bulbous in shape, with mandibular parts that can pierce and suck and paired abdominal tubes that point backwards, and come in both winged and wingless forms.〔(【引用サイトリンク】url=http://www.extension.uidaho.edu/ipm/rootAphid.asp )〕〔(【引用サイトリンク】url=http://www.ipm.ucdavis.edu/PMG/r735300511.html )〕
They are known for their consequential effects on agriculture due to infestation of plants, and efforts to control the pests have proved to be difficult.
==Description==
Sugarbeet root aphids are characterized to be as small as pinheads, and take on a pale white-yellow color.〔 They have globular bodies that are soft, with mandibular parts that allow them to pierce and suck and paired abdominal tubes that point backwards.〔 There are both winged and wingless sugarbeet root aphids.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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