{"id":664,"date":"2015-11-24T05:00:59","date_gmt":"2015-11-24T05:00:59","guid":{"rendered":"https:\/\/aphidtrek.org\/?page_id=664"},"modified":"2024-12-15T16:03:42","modified_gmt":"2024-12-15T16:03:42","slug":"cavariella","status":"publish","type":"page","link":"https:\/\/aphidtrek.org\/?page_id=664","title":{"rendered":"Cavariella"},"content":{"rendered":"\n<p><strong><em>Cavariella<\/em> del Guercio<\/strong><\/p>\n\n\n\n<p>This page updated:\u00a0December 2024.<\/p>\n\n\n\n<p>This is another genus that in North America is composed mostly of non-native species, at least in terms of the species that are most often seen and collected. Life cycles usually involve <em>Salix<\/em> and Umbelliferae (Apiaceae).&nbsp;&nbsp; Some appear to be legitimately native to north America.&nbsp; In recent years I&#8217;ve picked up a mysterious, unidentifiable species on a native umbel in the forests of southern Oregon.&nbsp; See my notes on <em>C. digitata<\/em> below for an update on that work.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\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=\"#c-aegopodii\"><em>Cavariella aegopodii<\/em> (Scopoli)<\/a><\/li>\n\n\n\n<li><a href=\"#c-digitata\"><em>Cavariella digitata<\/em> Hille Ris Lambers<\/a><\/li>\n\n\n\n<li><span lang=\"EN-US\"><a href=\"#c-pastinacae\"><em>Cavariella pastinacae<\/em>\u00a0(Linnaeus)<\/a><\/span><\/li>\n<\/ul>\n\n\n\n<p id=\"c-aegopodii\"><strong><em>Cavariella aegopodii<\/em> (Scopoli)<\/strong><\/p>\n\n\n\n<p>This is one of the common pest aphids all across North America, often feeding on carrots and other cultivated Umbelliferae.&nbsp; However, it is like a handful of other introduced species that have penetrated all sorts of natural systems in North America.&nbsp; I have it from many hosts and habitat types in North America and Europe.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-ex-Parsley-Eagle-21-v-2013.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"889\" height=\"539\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-ex-Parsley-Eagle-21-v-2013.jpg\" alt=\"Cavariella aegopodii from parsley in my Idaho garden in May.\" class=\"wp-image-665\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-ex-Parsley-Eagle-21-v-2013.jpg 889w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-ex-Parsley-Eagle-21-v-2013-300x182.jpg 300w\" sizes=\"auto, (max-width: 889px) 100vw, 889px\" \/><\/a><figcaption class=\"wp-element-caption\">Cavariella aegopodii from parsley in my Idaho garden in May.<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-male-x-2012-Eagle-3.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"704\" height=\"710\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-male-x-2012-Eagle-3.jpg\" alt=\"Cavariella aegopodii male near Eagle, Idaho.\" class=\"wp-image-666\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-male-x-2012-Eagle-3.jpg 704w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-male-x-2012-Eagle-3-150x150.jpg 150w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-aegopodii-male-x-2012-Eagle-3-297x300.jpg 297w\" sizes=\"auto, (max-width: 704px) 100vw, 704px\" \/><\/a><figcaption class=\"wp-element-caption\">Cavariella aegopodii male near Eagle, Idaho.<\/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=\"c-digitata\"><strong><em>Cavariella digitata<\/em> Hille Ris Lambers<\/strong><\/p>\n\n\n\n<p>This is one of the species of <em>Cavariella<\/em> that appears to be native to North America.&nbsp; When I first found it in 2004 I was delighted, thinking I&#8217;d found a rare and unusual species. Species that seem rare are often far more common than thought once concerted effort is made to find them. This is the case with <em>C. digitata<\/em>. Once my search image was formed, I found this aphid on willows in Idaho, Oregon, California, New Mexico, Wyoming, and Alberta (Canada). Then, in 2016 I found a small <em>Cavariella<\/em> on small unidentified umbels growing in the forest of southern Oregon. These specimens had cylindrical siphunculi as in <em>C. digitata<\/em> but had extremely short 4 or 5-segmented antennae. The latter brought pause as to species identification since <em>C. digitata<\/em> was known to have (5) 6-segmented antennae. Subsequently I tried to accumulate more material of <em>C. digitata<\/em> from <em>Salix<\/em> and these mysterious short-antennae specimens from umbels in the forest. <\/p>\n\n\n\n<p>My taxonomy skills with Apiaceae (i.e., Umbelliferae) are poor, feeling daunted by the frequent need to have both flowers and fruits to run through a key. So, I have recently relied on picture books. From those picture books, the host(s) of the mysterious umbel feeders seem to be <em>Sium<\/em> and\/or <em>Oenanthe<\/em>.<\/p>\n\n\n\n<p>Having accumulated umbel samples from many sites in Oregon, plus a sample each from California and Colorado, during December of 2021 I sat down to consider whether the forms on <em>Salix<\/em> and umbels should be considered the same species. I decided they should. My initial concern with the 4 or 5-segmented antennae on specimens from umbels was alleviated by looking at the full range of variation from both primary and secondary hosts in both apterae and alatae. This species seems to be unusually variable in terms of antenna length and proportions of the segments. Some specimens even vary from one side to the other in terms of segmentation and total length. Another troublesome character is that small specimens can entirely lack accessory setae on the ultimate rostral segment. This character is sometimes useful in constructing keys to <em>Cavariella<\/em>, but it&#8217;ll be a problem now that <em>C. digitata<\/em> is better-known!<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-digitata-ex-Salix-Lester-Creek-23-vi-2012.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"687\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-digitata-ex-Salix-Lester-Creek-23-vi-2012.jpg\" alt=\"Cavariella digitata apterous vivipara near Lester Creek, Idaho.\" class=\"wp-image-670\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-digitata-ex-Salix-Lester-Creek-23-vi-2012.jpg 687w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-digitata-ex-Salix-Lester-Creek-23-vi-2012-150x150.jpg 150w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2015\/11\/Cavariella-digitata-ex-Salix-Lester-Creek-23-vi-2012-300x300.jpg 300w\" sizes=\"auto, (max-width: 687px) 100vw, 687px\" \/><\/a><figcaption class=\"wp-element-caption\">Cavariella digitata apterous vivipara near Lester Creek, Idaho.<\/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=\"c-pastinacae\"><strong><span lang=\"EN-US\"><em>Cavariella pastinacae<\/em><\/span><\/strong><span lang=\"EN-US\"><strong>\u00a0(Linnaeus)<\/strong><\/span><\/p>\n\n\n\n<p>This is another common introduced European species, frequenting both managed and natural systems, feeding on willows (<em>Salix<\/em>) as primary host, alternating to Umbelliferae, especially <em>Heracleum<\/em> (cow parsnip).&nbsp; It likely occurs across most of the U.S. and Canada, and I often walk by it without collecting it.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2018\/06\/Cavariella-pastinacae-ex-Salix-nr-Banks-18-v-2013-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"641\" height=\"564\" src=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2018\/06\/Cavariella-pastinacae-ex-Salix-nr-Banks-18-v-2013-1.jpg\" alt=\"\" class=\"wp-image-1434\" srcset=\"https:\/\/aphidtrek.org\/wp-content\/uploads\/2018\/06\/Cavariella-pastinacae-ex-Salix-nr-Banks-18-v-2013-1.jpg 641w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2018\/06\/Cavariella-pastinacae-ex-Salix-nr-Banks-18-v-2013-1-300x264.jpg 300w, https:\/\/aphidtrek.org\/wp-content\/uploads\/2018\/06\/Cavariella-pastinacae-ex-Salix-nr-Banks-18-v-2013-1-624x549.jpg 624w\" sizes=\"auto, (max-width: 641px) 100vw, 641px\" \/><\/a><figcaption class=\"wp-element-caption\">Cavariella pastinacae on Salix in the spring.<\/figcaption><\/figure>\n<\/div>\n\n\n<p><a href=\"#species-list\">Back to top<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cavariella del Guercio This page updated:\u00a0December 2024. This is another genus that in North America is composed mostly of non-native species, at least in terms of the species that are most often seen and collected. Life cycles usually involve Salix and Umbelliferae (Apiaceae).&nbsp;&nbsp; Some appear to be legitimately native to north America.&nbsp; In recent years [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":10,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-664","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/664","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=664"}],"version-history":[{"count":11,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/664\/revisions"}],"predecessor-version":[{"id":2132,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/664\/revisions\/2132"}],"up":[{"embeddable":true,"href":"https:\/\/aphidtrek.org\/index.php?rest_route=\/wp\/v2\/pages\/10"}],"wp:attachment":[{"href":"https:\/\/aphidtrek.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}