{"id":250,"date":"2015-04-10T00:24:19","date_gmt":"2015-04-10T00:24:19","guid":{"rendered":"https:\/\/aphidtrek.org\/?page_id=250"},"modified":"2024-12-17T22:22:02","modified_gmt":"2024-12-17T22:22:02","slug":"rhopalosiphum","status":"publish","type":"page","link":"https:\/\/aphidtrek.org\/?page_id=250","title":{"rendered":"Rhopalosiphum"},"content":{"rendered":"\n<p><strong><em>Rhopalosiphum<\/em> Koch<\/strong><\/p>\n\n\n\n<p>This page updated:\u00a0December 2024.<\/p>\n\n\n\n<p>Oh my goodness, I am glad that I don&#8217;t work on this genus seriously.&nbsp; I still have trouble recognizing the species, not sure why.&nbsp; Is it because the keys are troubling or inadequate?&nbsp; Is it because more species exist than are accounted for in the keys?&nbsp; Is it because of crazy variation of each species in terms of habitus, color, or morphology?&nbsp; Am I just a knucklehead?&nbsp; Maybe as time allows I will add more photos and discussion.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Crataegus-Towel-Falls-11-vi-2011-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"264\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Crataegus-Towel-Falls-11-vi-2011-1-300x264.jpg\" alt=\"One of the weird Rhopalosiphum I have collected, this one from a Crataegus shoot in the intense shade of a thicket near a stream in eastern Washington.\" class=\"wp-image-251\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Crataegus-Towel-Falls-11-vi-2011-1-300x264.jpg 300w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Crataegus-Towel-Falls-11-vi-2011-1.jpg 990w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">One of the weird Rhopalosiphum I have collected, this one from a Crataegus shoot in the intense shade of a thicket near a stream in eastern Washington.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><em>Rhopalosiphum<\/em> species mostly feed on <em>Prunus<\/em> and relatives as primary hosts, and monocots as secondary hosts.&nbsp; Once slide mounted the genus is fairly easy to recognize among aphids in western North America, but as <a href=\"http:\/\/www.aphidsonworldsplants.info\/d_APHIDS_R.htm#Rhopalosiphum\" target=\"_blank\" rel=\"noopener noreferrer\">Blackman and Eastop<\/a> note, the generic limits are not well-defined from a world-wide perspective.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"967\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2-1024x967.jpg\" alt=\"A Rhopalosiphum similar to R. nymphaeae on Prunus near Spokane, Washington in May.\" class=\"wp-image-1121\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2-1024x967.jpg 1024w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2-300x283.jpg 300w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2-768x725.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-ex-Prunus-I-90-Exit-264-v-2010-2.jpg 1066w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">A Rhopalosiphum similar to R. nymphaeae on Prunus near Spokane, Washington in May.<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Specimens like those below on chokecherry trouble me because they seem to be one species, in this case <em>Rhopalosiphum padi<\/em> (L.), but were found on the typical host plant of another species (in this case,<em> R. cerasifoliae<\/em>).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-padi-ChokeCherry-Hayden-x-2010-4.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"535\" height=\"737\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-padi-ChokeCherry-Hayden-x-2010-4.jpg\" alt=\"Copulating male and oviparous female of possibly Rhopalosiphum padi on chokecherry, R. virginiana in northern Idaho in October.\" class=\"wp-image-1131\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-padi-ChokeCherry-Hayden-x-2010-4.jpg 535w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-padi-ChokeCherry-Hayden-x-2010-4-218x300.jpg 218w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/><\/a><figcaption class=\"wp-element-caption\">Copulating male and oviparous female of possibly Rhopalosiphum padi on chokecherry, R. virginiana in northern Idaho in October.<\/figcaption><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"species-list\">Species covered below (click on the name to jump to that species):<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#r-cerasifoliae\"><em>Rhopalosiphum cerasifoliae<\/em> (Fitch)<\/a><\/li>\n\n\n\n<li><a href=\"#r-enigmae\"><em>Rhopalosiphum enigmae <\/em>Hottes &amp; Frison<\/a><\/li>\n\n\n\n<li><a href=\"#r-musae\"><em>Rhopalosiphum musae<\/em> (Schouteden)<\/a><\/li>\n\n\n\n<li><a href=\"#r-oxyacanthae\"><em>Rhopalosiphum oxyacanthae <\/em>(Schrank)<\/a><\/li>\n\n\n\n<li><a href=\"#r-padi\"><em>Rhopalosiphum padi<\/em> (L.)<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p id=\"r-cerasifoliae\"><strong><em>Rhopalosiphum cerasifoliae<\/em> (Fitch)<\/strong><\/p>\n\n\n\n<p>This species uses chokecherries as primary host (e.g. <em>Prunus virginiana<\/em>), and apparently migrates to Cyperaceae.&nbsp; Despite collecting near and among chokecherries on almost every collecting trip I make, I rarely find this aphid.&nbsp; I have no confident records of it from secondary hosts, but I think that many of my <em>Rhopalosiphum<\/em> samples from mixed wetland herbs are this species.&nbsp; So, yet another frustrating <em>Rhoposiphum<\/em> species to understand.&nbsp; When on chokecherry, it causes a leaf roll, tends to occur in very large numbers, and is easy to recognize even in the field.<\/p>\n\n\n\n<p>I have samples from Washington, Oregon, Idaho, Wyoming, Colorado, Nebraska, New Mexico, and North Dakota.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-cerasifoliae-Boise-5-v-2012.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"604\" height=\"738\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-cerasifoliae-Boise-5-v-2012.jpg\" alt=\"Rhopalosiphum cerasifoliae from chokecherry in Boise, Idaho in early may.\" class=\"wp-image-1125\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-cerasifoliae-Boise-5-v-2012.jpg 604w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-cerasifoliae-Boise-5-v-2012-246x300.jpg 246w\" sizes=\"auto, (max-width: 604px) 100vw, 604px\" \/><\/a><figcaption class=\"wp-element-caption\">Rhopalosiphum cerasifoliae from chokecherry in Boise, Idaho in early may.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p id=\"r-enigmae\"><strong><em>Rhopalosiphum enigmae <\/em>Hottes &amp; Frison<\/strong><\/p>\n\n\n\n<p>I often check <em>Typha<\/em> (cattail) for aphids everywhere I go, and after many years of this, I finally found this aphid in late May of 2004.\u00a0 This species is reported to be monoecious holocyclic, which requires that it overwinter as eggs on or associated with <em>Typha<\/em>.\u00a0 Most places Typha grows\u00a0 in western North America are completely inundated with water during the winter, possibly causing the extreme rarity of this aphid.\u00a0 The site where I found it was a small man-made retaining wall near a man-made reservoir.\u00a0 This retaining wall maintained a steady water level behind it, allowing the <em>Typha<\/em> to experience a constant water level.\u00a0 This aphid was therefore, it seemed to me, able to survive year after year in this site due to the predictability of the habitat.\u00a0 I visited the same site in early June of 2010 and easily found many more specimens. I now have specimens from that site in Washington plus a couple places in Colorado (including our back yard).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-enigmae-Potholes-vi-2010-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"680\" height=\"568\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-enigmae-Potholes-vi-2010-1.jpg\" alt=\"Rhopalosiphum enigmae from central Washington in early June.\" class=\"wp-image-1123\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-enigmae-Potholes-vi-2010-1.jpg 680w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-enigmae-Potholes-vi-2010-1-300x251.jpg 300w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" \/><\/a><figcaption class=\"wp-element-caption\">Rhopalosiphum enigmae from central Washington in early June.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p id=\"r-musae\"><strong><em>Rhopalosiphum musae<\/em> (Schouteden)<\/strong><\/p>\n\n\n\n<p>While we lived in Lakeview in southern Oregon (2015-2021), I studied a <em>Rhopalosiphum<\/em> on <em>Prunus subcordata<\/em>.\u00a0 It is a truly striking and fabulous aphid, with bold wax bands, dark coloration, and the propensity to develop into stunningly large populations on this shrubby plant commonly known as Sierra plum. Work by colleagues led by Gary Miller at the USNM has supported the idea that this aphid is <em>Rhopalosiphum musae<\/em>, a species known mostly from anholocyclic populations around much of the world. Southern Oregon is clearly part of its native range. Spring populations persist on <em>Prunus<\/em> for 3 or more generations, building up populations of great density on stems and leaves. I have one sample of <em>Rhopalosiphum<\/em> from the semi-aquatic plant <em>Alisma<\/em> that may be this species. All my samples are from southern Oregon, just north of California.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"613\" height=\"573\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-Fremont-N.F.-9-v-2020.jpg\" alt=\"\" class=\"wp-image-1713\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-Fremont-N.F.-9-v-2020.jpg 613w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-Fremont-N.F.-9-v-2020-300x280.jpg 300w\" sizes=\"auto, (max-width: 613px) 100vw, 613px\" \/><figcaption class=\"wp-element-caption\">Rhopalosiphum musae fundatrix from the Fremont-Winema National Forest west of Lakeview, collected early May of 2020. These cause slight leaf deformation on apical parts of branches.<\/figcaption><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1010\" height=\"1024\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016-1010x1024.jpg\" alt=\"An as-yet unidentified Rhopalosiphum from Prunus subcordata in southern Oregon.\" class=\"wp-image-1100\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016-1010x1024.jpg 1010w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016-296x300.jpg 296w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016-768x779.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-3rd-gen-ex-Prunus-subcordata-W-side-Lakeview-valley-15-v-2016.jpg 1073w\" sizes=\"auto, (max-width: 1010px) 100vw, 1010px\" \/><\/a><figcaption class=\"wp-element-caption\">Rhopalosiphum musae from Prunus subcordata in southern Oregon.<\/figcaption><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-768x1024.jpg\" alt=\"\" class=\"wp-image-1714\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-768x1024.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-225x300.jpg 225w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-1152x1536.jpg 1152w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-1536x2048.jpg 1536w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-624x832.jpg 624w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-musae-nr-Bly-Summit-vi-2018-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption class=\"wp-element-caption\">A severe infestation of Rhopalosiphum musae on Prunus subcordata near Bly, Oregon, in June.  The upper stems of this plant were completely coated in aphids, a typical infestation in late spring.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p id=\"r-oxyacanthae\"><strong><em>Rhopalosiphum oxyacanthae <\/em>(Schrank)<\/strong><\/p>\n\n\n\n<p>This is a species that is probably of North American origin (see <a href=\"http:\/\/www.aphidsonworldsplants.info\/d_APHIDS_R.htm#Rhopalosiphum\">Blackman and Eastop<\/a>) but that is now almost cosmopolitan.&nbsp; It is by far the most easily collected <em>Rhopalosiphum<\/em> in western North America, being easily found in spring and fall on almost every <em>Crataegus, Malus<\/em>, and <em>Sorbus<\/em> plant I&#8217;ve ever looked at.&nbsp; Interestingly, I have never seen it on secondary hosts, reported to be subterranean parts of grasses, tended by ants.&nbsp; The latter is possibly due to a more cryptic life style than some other root-feeding aphids, which are apparent from above due to soil disturbance caused by tending ants.&nbsp; (I still need to hone my skill at collecting root feeding aphids.)<\/p>\n\n\n\n<p>My samples are from Washington, Oregon, Idaho, Utah, Colorado, Minnesota, Ohio, and Quebec.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"660\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015-1024x660.jpg\" alt=\"Rhopalosiphum oxyacanthae fundatrix on Crataegus in southern Idaho in April. \" class=\"wp-image-1127\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015-1024x660.jpg 1024w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015-300x194.jpg 300w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015-768x495.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-Eagle-Crataegus-iv-2015.jpg 1124w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Rhopalosiphum oxyacanthae fundatrix on Crataegus in southern Idaho in April.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"949\" height=\"1024\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016-949x1024.jpg\" alt=\"Rhopalosiphum oxyacanthae fundatrix nymphs on a bud of apple in Lakeview, Oregon in April.\" class=\"wp-image-1129\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016-949x1024.jpg 949w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016-278x300.jpg 278w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016-768x828.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/04\/Rhopalosiphum-oxyacanthae-fund-nys-ex-Apple-Lakeview-7-iv-2016.jpg 1132w\" sizes=\"auto, (max-width: 949px) 100vw, 949px\" \/><\/a><figcaption class=\"wp-element-caption\">Rhopalosiphum oxyacanthae fundatrix nymphs on a bud of apple in Lakeview, Oregon in April.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p id=\"r-padi\"><strong><em>Rhopalosiphum padi<\/em> (L.)<\/strong><\/p>\n\n\n\n<p>This is the most common pest species of <em>Rhopalosiphum<\/em> in western North America, feeding on grains and many species of grass plus several species of <em>Prunus<\/em> as primary hosts. Like so many common species, I don&#8217;t often collect it and have few photos. Also, I worry that what we quickly and happily identify as <em>R. padi<\/em> in the west might actually be a mixture of species, perhaps including things like <em>Rhopalosiphum padiformis<\/em> Richards more often than we think.<\/p>\n\n\n\n<p>I have material identified as this species from Alaska, British Columbia, Washington, Oregon, California, Idaho, Utah, Colorado, New Mexico, Quebec, and Germany.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"890\" height=\"596\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-padi-Moses-x-2010.jpg\" alt=\"\" class=\"wp-image-1715\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-padi-Moses-x-2010.jpg 890w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-padi-Moses-x-2010-300x201.jpg 300w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-padi-Moses-x-2010-768x514.jpg 768w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2020\/05\/Rhopalosiphum-padi-Moses-x-2010-624x418.jpg 624w\" sizes=\"auto, (max-width: 890px) 100vw, 890px\" \/><figcaption class=\"wp-element-caption\">Rhopalosiphum padi alate female on a Prunus leaf in central Washington in late October.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rhopalosiphum Koch This page updated:\u00a0December 2024. Oh my goodness, I am glad that I don&#8217;t work on this genus seriously.&nbsp; I still have trouble recognizing the species, not sure why.&nbsp; Is it because the keys are troubling or inadequate?&nbsp; Is it because more species exist than are accounted for in the keys?&nbsp; Is it because [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":741,"menu_order":22,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-250","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/250","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=250"}],"version-history":[{"count":15,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/250\/revisions"}],"predecessor-version":[{"id":2259,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/250\/revisions\/2259"}],"up":[{"embeddable":true,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/741"}],"wp:attachment":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}