{"id":12229,"date":"2021-04-15T12:59:46","date_gmt":"2021-04-15T17:59:46","guid":{"rendered":"https:\/\/uwm.edu\/field-station\/?p=12229"},"modified":"2021-04-15T12:59:46","modified_gmt":"2021-04-15T17:59:46","slug":"galls-vii","status":"publish","type":"post","link":"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/galls-vii\/","title":{"rendered":"Galls VII"},"content":{"rendered":"<p>Howdy, BugFans,<\/p>\n<p>Plant galls are swellings formed on the outsides of flowers, buds, leaves, veins, petioles, stems and\/or trunks. Many are stimulated by animals, but some are caused by fungi and bacteria, and technically, the thickened bark tissue where two leaning trees rub against each other is a gall (technically, a raised wart or calloused area on human skin could be called a gall, too). Galls precipitated by animals appear on specific parts of specific hosts and are formed in distinctive shapes, and the names of the host and the gall-maker are often intertwined. Mites and insects (especially aphids, flies, and wasps) are the usual culprits.<\/p>\n<p>Here\u2019s the short version: a mite or an immature insect (or perhaps its mother, when she deposits it there) introduces chemicals to a plant that signal it to grow extra tissue. The mechanics of feeding may contribute, too. The tissue surrounds the bug, enclosing it in an edible shelter. Galls are pretty predator-resistant, though some parasitoids have figured it out, and some animals eat the whole gall. Leafier galls invite co-habitation by inquilines (from the Latin for \u201clodger\u201d or \u201ctenant\u201d) \u2013 tiny insects looking for a place to squat, and perhaps for a meal. The tissue that will feed the tiny larva or nymph is also a prison, protecting the plant from any further peregrinations.<\/p>\n<p>Most galls are smallish and thick-walled, which doesn\u2019t leave much room for the gall-maker; by default, gall insects and mites are tiny, and since they don\u2019t move around a lot, the younger stages may dispense with unnecessary parts like legs (here\u2019s a <a href=\"https:\/\/bugguide.net\/node\/view\/248940\/bgimage\">Scanning Electron Microscope image of a gall mite<\/a> <i class=\"fa fa-external-link\"><\/i>). Some galls are woody and persistent and can still be seen on plants in the next growing season, but new galls start to appear early as female gall-makers or their offspring take advantage of the new vegetation.<\/p>\n<p>In general, gall-makers don\u2019t damage their hosts, but there are some cosmetic effects, and sometimes the weight of the galls makes trees more susceptible to weather damage. The Catch 22 of gall control is that by the time the galls are apparent, the gall-maker is tucked inside, out of reach of pesticides. In order to get rid of unsightly leaves, you have to lop off branches.<\/p>\n<p>This is not our first foray into galls; to travel back to where it all began, see\u00a0<a href=\"https:\/\/uwm.edu\/field-station\/galls-i\/\">https:\/\/uwm.edu\/field-station\/galls-i\/<\/a>,\u00a0<a href=\"https:\/\/uwm.edu\/field-station\/galls-ii\/\">https:\/\/uwm.edu\/field-station\/galls-ii\/<\/a>,\u00a0<a href=\"https:\/\/uwm.edu\/field-station\/galls-iii-oddball-galls\/\">https:\/\/uwm.edu\/field-station\/galls-iii-oddball-galls\/<\/a>.<\/p>\n<p><strong><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-12239 size-medium\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz-300x300.jpg\" alt=\"gall on basswood\" width=\"300\" height=\"300\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz-768x768.jpg 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-basswood18-1rz.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>BASSWOOD SPINDLE\/BUGLE\/RED NAIL GALLS<\/strong> are caused by a mite named <em>Eriophyes tiliae,<\/em> family <em>Eriophyidae<\/em> (<a href=\"https:\/\/bugguide.net\/node\/view\/965352\/bgimage\">basswood\u2019s genus is <em>Tilia<\/em><\/a> <i class=\"fa fa-external-link\"><\/i>). The female mite overwinters in bark crevices and emerges as warming air summons the new leaves.\u00a0 She feeds on the tender leaves, and the galls that form have an entrance\/exit hole on the <a href=\"https:\/\/bugguide.net\/node\/view\/492944\/bgimage\">under surface of the leaf<\/a> <i class=\"fa fa-external-link\"><\/i>. She will eventually mate within her gall, lay her eggs in it, and die. Her offspring mature in about two weeks and then leave the gall, dispersing on the wind or hitchhiking on other animals. Imagine the odds against a barely-mobile mite floating through the air and landing on the proper host plant!<\/p>\n<p>If it does, and if the basswoods are still putting out new growth, there may be a second generation of galls; otherwise, the final generation will retire to bark shelters in fall. <a href=\"https:\/\/bugguide.net\/node\/view\/600217\">Some spindle galls are red<\/a> <i class=\"fa fa-external-link\"><\/i>. Various species of <em>Eriophyes<\/em> mites target basswood, willow, cherry, maple, and even poison ivy, each producing a designer chemical that makes the characteristic gall.<\/p>\n<p><strong><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-hickory18-5rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-12234\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-hickory18-5rz-150x150.jpg\" alt=\"gall on hickory\" width=\"150\" height=\"150\" \/><\/a>HICKORY POUCH\/LEAF STEM GALLS<\/strong> are caused by an aphid called<em>\u00a0Phylloxera caryaecaulis<\/em>,\u00a0in the family <a href=\"https:\/\/bugguide.net\/node\/view\/649955\"><em>Phylloxeridae<\/em><\/a> <i class=\"fa fa-external-link\"><\/i> (hickory trees are in the genus <em>Carya<\/em>\u00a0and\u00a0<em>caulis<\/em> means stem). The name\u00a0<em>Phylloxera<\/em>\u00a0raises a bunch of red flags because a related aphid is a huge pest in vineyards \u2013 some European grape varieties were almost wiped out by this American aphid in the 1800\u2019s but were saved by grafting them onto resistant American varieties (with, said the connoisseurs, a resulting decline in quality).<\/p>\n<p><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-hickory18-2rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-thumbnail wp-image-12235\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-hickory18-2rz-150x150.jpg\" alt=\"gall on hickory\" width=\"150\" height=\"150\" \/><\/a>Anyway, the aphids overwinter as eggs, and a gall forms as a newly-emerged, wingless female feeds on the early leaves and petioles. Eventually, she lays eggs (remember, lots of aphids practice parthenogenesis during most of their life cycle \u2013 females give birth to more females, no males required). The nymphs, which will be winged, <a href=\"https:\/\/bugguide.net\/node\/view\/926242\/bgimage\">feed inside the gall for about two weeks<\/a> <i class=\"fa fa-external-link\"><\/i>, and then the gall splits, releasing them. They lay more eggs, and these produce both males and females (insuring that the gene pool doesn\u2019t get stagnant), and their eggs will overwinter.<\/p>\n<p>Hickory pouch galls start out green, take on a reddish tinge as they age, and turn black after they split. These galls are not as innocuous as the basswood spindle galls &#8211; if a tree is young or is heavily infested with <em>Phylloxera<\/em> for successive years, branches may be weakened.<\/p>\n<p><strong><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-12233\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz-150x150.jpg\" alt=\"gall on oak\" width=\"150\" height=\"150\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz-768x768.jpg 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-14rz.jpg 800w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>OAK ROSETTE GALLS<\/strong> are caused by a tiny wasp <em>Andricus quercusfrondosus<\/em> (<em>Quercus<\/em> is the genus of oak trees). Oaks host a lot of different galls, and many of them are formed by similar gall wasps\/\u201dgall flies\u201d in the family <em>Cynipidae<\/em>. \u00a0The BugLady has been trying to track this one down for years &#8211; she finally found it as <em>Andricus frondosa<\/em> in \u201c<a href=\"http:\/\/www.cassisaari.com\/j\/wp-content\/uploads\/2012\/03\/Gronemann-1930-FiftyCommonPlantGalls.pdf\">Fifty Common Galls of the Chicago Area<\/a>\u201d <i class=\"fa fa-file-pdf-o\"><\/i> \u2014 but she wasn\u2019t able to find out very much about it. Oak rosette gall wasps use post, white, and bur oaks as hosts.<\/p>\n<p><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-12232 size-thumbnail\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz-150x150.jpg\" alt=\"gall on oak\" width=\"150\" height=\"150\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz-768x768.jpg 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-oak17-15rz.jpg 800w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>The gall-maker is a wasp larva that induces the plant to grow a dense cluster of small leaves, and it stays in the leafy gall throughout winter and exits in spring (along with its inquilines, which may include species of gall wasps that don\u2019t make their own galls but find protection in others.\u2019). Like aphids, some <em>cynipid<\/em> species are parthenogenic, and others alternate all-female generations with two-sex generations.<\/p>\n<p><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-12238\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz-150x150.jpg\" alt=\"gall on cedar apple\" width=\"150\" height=\"150\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz-768x768.jpg 768w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple-rust14-2rz.jpg 850w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>The <strong>CEDAR APPLE GALL<\/strong> (<em>Gymnosporangium juniperi-virginianae<\/em>) (<em>Juniperus virginiana\u00a0<\/em>is the scientific name of eastern red cedar) is actually a rust; the gall is caused not by an arthropod but by a fungus, and it has an interesting life cycle.\u00a0 Finding the rust in its early stages is like finding a juniper dressed up in sea anemones.<\/p>\n<p><a href=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-6rz.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-thumbnail wp-image-12236\" src=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-6rz-150x150.jpg\" alt=\"gall on cedar apple\" width=\"150\" height=\"150\" srcset=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-6rz-150x150.jpg 150w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-6rz-300x300.jpg 300w, https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-6rz.jpg 653w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>It\u2019s in a family of rust fungi called <em>Pucciniaceae<\/em> (the BugLady wonders whether the person who named this family was an opera fan). It\u2019s a common rust in North America, and it needs two kinds of host trees to complete its life cycle \u2013 a juniper species and an apple species (including hawthorn, serviceberry, and crabapple).\u00a0 The fungus overwinters on the red cedar.<\/p>\n<p>The orange-tentacled \u201canemone\u201d appears with the spring rains, and the tentacles that produce spores (they\u2019re called \u201cgelatinous telial horns\u201d) soon wither, but they\u2019re capable of rehydrating a few times. Spores are blown to nearby apple trees, which get yellow spots on the upper surfaces of their leaves and eventually, bunches of tiny, spore-dispersing tubes or threads below (<a href=\"https:\/\/extension.okstate.edu\/fact-sheets\/cedar-apple-rust.html\">some pictures here<\/a> <i class=\"fa fa-external-link\"><\/i>). The spores that are made on the apple trees are only able to grow if they land on a juniper, and the beat goes on. It may take two years after the return trip for the galls to form again on juniper.<\/p>\n<p>Vocabulary word for the day \u2013 the study of the mechanics of galls and gall-makers is called\u00a0cecidiology\/cecidology, and the studier is called a cecidiologist\/cecidologist.<\/p>\n<p>Go outside \u2013 find some galls!<\/p>\n<p><em>The BugLady<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Howdy, BugFans, Plant galls are swellings formed on the outsides of flowers, buds, leaves, veins, petioles, stems and\/or trunks. Many are stimulated by animals, but some are caused by fungi and bacteria, and technically, the thickened bark tissue where two &hellip;<\/p>\n","protected":false},"author":19040,"featured_media":12237,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[8],"tags":[459],"class_list":["post-12229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bug-of-the-week","tag-galls"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Field Station<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/galls-vii\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Galls VII\" \/>\n<meta property=\"og:description\" content=\"Howdy, BugFans, Plant galls are swellings formed on the outsides of flowers, buds, leaves, veins, petioles, stems and\/or trunks. Many are stimulated by animals, but some are caused by fungi and bacteria, and technically, the thickened bark tissue where two &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/uwm.edu\/field-station\/bug-of-the-week\/galls-vii\/\" \/>\n<meta property=\"og:site_name\" content=\"Field Station\" \/>\n<meta property=\"article:published_time\" content=\"2021-04-15T17:59:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/uwm.edu\/field-station\/wp-content\/uploads\/sites\/380\/2021\/04\/gall-cedar-apple14-5rz.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"totty@uwm.edu\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"totty@uwm.edu\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/\"},\"author\":{\"name\":\"totty@uwm.edu\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/#\\\/schema\\\/person\\\/365468c94aabed8a123e6da688a6d5c8\"},\"headline\":\"Galls VII\",\"datePublished\":\"2021-04-15T17:59:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/\"},\"wordCount\":1229,\"image\":{\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/wp-content\\\/uploads\\\/sites\\\/380\\\/2021\\\/04\\\/gall-cedar-apple14-5rz.jpg\",\"keywords\":[\"Galls\"],\"articleSection\":[\"Bug of the Week\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/\",\"url\":\"https:\\\/\\\/uwm.edu\\\/field-station\\\/bug-of-the-week\\\/galls-vii\\\/\",\"name\":\"Galls VII - 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