Download this stock image: Fig gall aphid, Elm-grass root aphid, Elm Sack Gall Aphid (Byrsocrypta ulmi, Tetraneura ulmi, Eriosoma ulmi), gall at a leaf of an elm, Germany - TR62DB from Alamy's library of millions of high resolution stock photos, illustrations and vectors. However, the galls may also be found on American elm (Ulmus americana). Aphid induces a 1 inch long by ¼ inch high wrinkled swelling on the leaf surface, irregular like a rooster’s comb ; Reddish at first but turning brown as the season progresses; Found on American and red elm; More information on Leaf galls There has been even less work on the ecology of Tetraneura ulmi on its secondary host, the roots of grasses. The galls are stalked, approximately bean-shaped, smooth and shiny, and coloured reddish-green and/or yellow (see first picture below). June 2019. Populations without sexual forms occur commonly on secondary hosts. 73.3% of galls produced viable alates. It arises from the mid-rib of the upper surface of the leaf near its base (cf. Note the very small conical siphunculi. Unfortunately, these odd-looking plant structures can spoil the aesthetics of their deep green elm leaf platforms. Entomologist Dr. Art Evans and 88.9 WCVE producer Steve Clark note the perennial fall swarms of tiny aphids in the Richmond area. Elm Sack Galls (= Pouch Galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. In late summer, these whitefly-like aphids give birth to nymphs that develop wings. The elm-grass root aphid is little-researched compared to many other tree aphids. Download this stock image: Fig gall aphid, Elm-grass root aphid, Elm Sack Gall Aphid (Byrsocrypta ulmi, Tetraneura ulmi, Eriosoma ulmi), gall at a leaf of an elm, Germany - TR62DC from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Ivens et al. The witchhazel leaf gall aphid, Hormaphis hamamelidis, is most often noticed as the "aleurodiform" (whitefly form) on birch leaves in late summer or fall. The pictures below show elm-grass root aphids on the roots of grasses attended by Lasius ants. Natural ecosystem First image above copyright Ivan Pančić, all rights reserved. By the beginning of June, galls reached 10.8 mm in length and 6.2 mm in width. Ivens et al. Photo by Jim Brighton. Gall-forming aphids, Pemphigus species, also occur on petioles and twigs of cottonwood. Tetraneura ulmi host alternates. Sign in Sign up for FREE Prices and download plans The manzanita leafgall aphid feeds on the leaves of kinnikinnick and other manzanita species (Arctostaphylos spp. After maturation the fundatrices produced on average 35.2 offspring. Gall mites infected on host plant, rain forest tree, Thailand. Elm sack galls (= pouch galls) are produced by a non-native European aphid, However, the galls may also be found on American elm (. Fecundity of the fundatrices ranged from 4 to 22 larvae. Tetraneura ulmi, the elm sack gall aphid, is a species of aphid in the family Aphididae. The picture below shows the offspring of the fundatrix maturing in the gall. The aphid was most abundant on Ulmus minor, much less so on Ulmus glabra and absent from Ulmus laevis. They are produced by a species of aphid, Tetraneura ulmi. Tetraneura ulmi has small conical siphunculi, with a flange (cf. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. in June-July to colonize roots of grasses(Poaceae). This was based on winged morphs being found in two colonies of Tetraneura ulmi, located in the oak-forest. Photo: The elm sack gall making aphid, Tetraneura ulmi Linnaeus (Hemiptera: Aphididae). The adult apterae on the secondary host, grass roots (see second picture below), are readily identified, being pale orange yellow, yellowish white or reddish. Elms are the primary host for the elm sack gall aphid. Although I find these galls most often on red elm, I've also occasionally found them on American elms. Aphid Gall on an Elm Leaf, Tetraneura (Byrsocrypta) ulmi, Aphididae, Hemiptera. Life cycle Natural enemies Other aphids on the same host. On a leaf. Early cockscomb galls are tubular-shaped, almost worm-like, and light green. Identification & Distribution: In spring the Eriosoma lanuginosum fundatrix and her offspring develop in large, closed, bloated-leaf galls (see first picture below) on various elm (Ulmus) species. Fertilized females only lay one egg each. Winged forms fly from elm galls in June and July to colonize roots of grasses where they are usually tended by moisture ants in the genus Lasius. Colopha compressa live in laterally compressed cockscomb-shaped galls along the midrib on the upper surface of elm leaves (see first picture below). Elm sack galls (= pouch galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. View All Images. If you find an elm in an Ohio woodland that's festooned by these odd-looking galls, it's highly likely the gall-adorned tree is a red elm (= slippery elm) (Ulmus rubra); it's almost a sure-fire identification. Blackman & Eastop list about 75 species of aphids as feeding on elms worldwide, and provides formal identification keys for aphids on Ulmus. Alternation of hosts is well known for other aphids (woolly apple aphid: apple and elm; woolly alder aphid: maple and alder; green peach aphid: peach and many other hosts), but the spiny witchhazel gall aphid seems to have the most complicated life cycle. Gall of the elm sack gall aphid Tetraneura ulmi. These fairly large, stalked galls go by the common name of "fig galls". The three focal species (Geoica utricularia, Forda marginata and Tetraneura ulmi) had considerable clonal diversity at the population level. Immature fundatrices were killed by insect and other predators in the initial stage of the gall formation. Elm sack galls (= pouch galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. Fundatrices matured within 3-4 weeks from hatching (from mid-May). The body length of Tetraneura ulmi alates is 1.8-2.6 mm. Elm cockscomb gall aphid Colopha ulmicola and C. graminis. Blue Dasher vs Fragile Forktail - Darn Damselflies Always Sneaking Up Behind You - Video. Elm cockscomb galls are produced by another aphid, Colopha ulmicola that also alternates between elms and grasses. On the primary host, elm, Tetraneura ulmi develop within galls on the leaves. Ivens et al. These fairly large, stalked galls go by the common name of "fig galls". For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006). We have used the keys and species accounts of Blackman & Eastop (1994) and Blackman & Eastop (2006) supplemented with Blackman (1974), Stroyan (1977), Stroyan (1984), Blackman & Eastop (1984), Heie (1980-1995), Dixon & Thieme (2007) and Blackman (2010). Lasius flavus 'husbandry' is characterized by low aphid 'livestock' diversity per colony, especially at the nest-chamber level, but it lacks the exclusive monocultures known from other cultivation mutualisms. Gall of the elm sack gall aphid Tetraneura ulmi. Yet more than half of the ant mounds contained just a single aphid species, a significantly higher percentage than expected from a random distribution. The elm-grass root aphid, Tetraneura ulmi, is also called the elm sack gall aphid. However, results of the study gave a strong indication for asexuality being the dominant mode of reproduction, so that populations consist of multiple clonal lineages. Tetraneura ulmi (Elm-grass root aphid) On the primary host, elm, Tetraneura ulmi develop within galls on the leaves. Gall of the elm sack gall aphid Tetraneura ulmi. In the fall, winged aphids emerge from grass to make a return migration to elm where they produce immatures that feed on the bark, and mature to apterous males and females. Use the browser back button to return to the menu. Tetraneura ulmi (Linnaeus, 1758) c g b (elm sack gall aphid) Tetraneura ulmicema Zhang, Guangxue, 1997 c g; Tetraneura ulmoides c g; Tetraneura utpali Chakrabarti, Samiran, Maity & D.K. Split Open to Show Interior and the Blue Aphids Inside. While I have yet to find a rampant population on American elms that rival those commonly found on red elm, I've noticed over the past few years that these galls are becoming increasingly common on American elms planted in Ohio landscapes. The unilocular, multilarval elm sack-galls that are produced by the aphid, Col-opha ulmisacculi, only arise on the up-per leaf surface between the leaf veins. Winged aphids that develop on the grass roots fly back to elms in the fall where their offspring spend the winter in bark crevices. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have found Tetraneura ulmi galls on English elm (Ulmus procera) quite widely in southern Britain, although never very commonly. (2012b) investigated aphid diversity within and between ant nest mounds. There were no signs of ants biting the wings off the alate forms of aphids. Elm-grass aphid, Elm sack gall aphid Gall on Ulmus, Elm Primary hosts: Ulmus minor, glabra Secondary hosts: Oligophagous on Poaceae: Tetraneura ulmi Durlston, Dorset. The colorful, fleshy, unilocular, unilar-val translucent oak galls produced by the gall … Gall of the elm sack gall aphid Tetraneura ulmi. Ulmus minor, Amsterdam, Vliegenbos: openings in the old gall when the gall is sliced open the inside is hidden by a dense tuft of wax threads after removal of the wax the winged and apterous aphids are … Although some authors consider Tetraneura ulmi to be anholocyclic (see below), Depa & Wojciechowski concluded that Tetraneura ulmi in nests of Lasius flavus was predominantly holocyclic. Elm sack galls (= pouch galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. The winged aphids that emerge from elm galls in the summer fly to various grasses where they colonize the roots. Aphid Galls Rising on Elms The leaves of native elms can look a bit bedraggled at this time of the year owing to the rise of pouch-like elm sack galls and the descriptively named elm cockscomb galls. Elm cockscomb galls are produced by another aphid, College of Food, Agricultural, and Environmental Sciences, Ohio Agricultural Research and Development Center. Tetraneura ulmi is found in Europe, across Asia to eastern Siberia, and has been introduced to North America. On a leaf. The eggs hatch from mid-May and the development of fundatrices in the gall lasts for 23 days. elm sack-gall aphid Tetraneura ulmi (Linnaeus, 1758). We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. All images used are copyright. However, Tetraneura ulmi may also be holocyclic at several sites in Northwestern Europe and Scandinavia so they started the study with the hypothesis that both types of life cycle may be present in the Dutch population. The galls split open to release the aphids. We are very grateful to Ivan Pančić for permitting us to use his image of the alate Tetraneura ulmi. The head, prothorax and appendages are brown, and the body is (sometimes) lightly dusted with wax. I can't find information on how harmful it is to the tree and if I should treat it or not. However, grasses (Poaceae) serve as a secondary host with the aphids feeding on the roots. Click on the filename to view the photos. Elm cockscomb gall aphid On this page: Identification & Distribution Biology & Ecology Are the galls aposematic? (2012a) studied four root aphid species (Tetraneura ulmi, Geioca utricularia, Forda marginata and Forda formicaria) in saltmarsh in the Netherlands. The gall of Kaltenbachiella pallida on elm is closed, more-or-less globular and covered in short fine hairs (see first picture below). The offspring of the Tetraneura ulmi fundatrix develop within their gall to winged viviparous alates (see first picture below) which have a shiny black head, thorax, antennae and legs, and greyish black abdominal segments. Prices and download plans . Tetraneura ulmi has been recorded from 9 Ulmus species. Elm sack galls (= pouch galls) are produced by a non-native European aphid,Tetraneura ulmi, that was introduced into the U.S. in the 1890s. and Elytrigia maritima) inside ant mounds. Urban (2003) describes the bionomics and harmfulness of Tetraneura ulmi during an outbreak in elms in Moravia in 2002. Its alternate common name is the "Oriental grass root aphid" because this aphid also flies to grasses where it feeds on the roots. The number of galls per leaf varied from 1-21 galls, with an average of 2.5 per leaf. ).Aphid feeding causes the leaves to thicken and form bright red galls. The sparse available literature suggested that all lived anholocyclically on the roots of secondary host grasses (Festuca rubra, Agrostis spp. The Tetraneura ulmi fundatrix (see second picture below), which induces production of the gall, is light green with the head, thorax, antennae and legs dark and transverse bands of light wax across the abdomen and thorax. Paul (1977) found at least 16 aphid species recorded on grass roots in Britain (Show British list). On a leaf. The elm gall-making aphid, T. nigriabdominalis, is an Asian native that has found its way into North America and Europe. Elm balloon-gall aphid On this page: Identification & Distribution Other aphids on the same host. Identification & Distribution. suggest that such culling of carbohydrate-providing symbionts for protein ingestion may maintain maximal host yield per aphid while also benefitting the 'domesticated' aphids as long as their clone-mates reproduce successfully. The pictures below show early stages in the development of a gall. About This Subject; View Images Details; View Images; 0 Images Geoica utricularia which has no siphunculi). Photo by Bonnie Bell. Tetraneura ulmi (Linnaeus, 1758) Ulmenblasenlaus Elm Sack Gall Aphid Tetraneura ulmi, plant galls DE, Chemnitz, Zeisigwald; 2012-06-15 14:24:01 Image number: 5377 The winged forms of the elm-grass root aphid (known in America as the elm sack gall aphid) emerge from elm galls(Ulmusspp.) Elm Cockscomb Gall These distinct galls, caused by an aphid, are about 1" long and about 1/4 inch high. On a leaf. Fortunately, neither of these aphid galls produce significant injury to the overall health of their elm tree … Aphid Galls. in June-July to colonize roots of grasses (Poaceae). What has been done is mostly focused on the interactions with ants. Pest description and damage These aphids are grayish or greenish and prefer to feed on new plant growth. Includes manzanita leaf gall aphid (Tamalia coweni). In September winged forms make a return migration to elm where they produce larvae which feed on the bark, and mature to apterous males and females. Elm Sack Galls (= Pouch Galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. Whilst we make every effort to ensure that identifications are correct, we cannot absolutely warranty their accuracy. This gives rise to the alternate common name of "elm-grass root aphid.". Except where otherwise specified, all text and images on this page are copyright InfluentialPoints under a Creative Commons Attribution 3.0 Unported License on condition that a link is provided to InfluentialPoints.com, Creative Commons Attribution 3.0 Unported License, Blackman & Eastop list 22 species that feed on, Blackman & Eastop list about 22 species that feed on. Dolgormaa & Munkhtsetseg (2015) looked at the bionomics of Tetraneura ulmi in Mongolia. Fortunately, neither of these galls produce significant injury to the overall health of their elm tree host. Bhattacharya, 1 c g; Tetraneura yezoensis c g Elm sack galls (= pouch galls) are produced by a non-native European aphid, Tetraneura ulmi, that was introduced into the U.S. in the 1890s. There was as low mortality of offspring of the fundatrices caused by Anthocoris confusus, larvae of Syrphidae, caterpillars of Pyralidae, and birds. They can be identified by the size and shape of the galls and characteristics of the exit holes produced when the galls split open. The galls dry, harden and turn brown as they age. The galls (see first picture below) are stalked, approximately bean-shaped, smooth and shiny, and coloured reddish-green and/or yellow. These aphids reproduce by giving birth to live nymphs. Life Cycle: Phylloxera overwinter in the egg stage in bark crevices. On affected leaves from 1 to 8 galls were recorded with 4-22 aphids per gall. Please contact me if you find errors. We have mostly made identifications from high resolution photos of living specimens, along with host plant identity. The winged forms of the elm-grass root aphid (known in America as the elm sack gall aphid) emerge from elm galls (Ulmus spp.) Use of images featured on Maryland Biodiversity Project is only permitted with express permission of the photographer. Depa & Wojciechowski (2008) looked in nests of various ant species especially Lasius flavus and Lasius niger in Poland. Elm Sack Gall Aphid galls in Howard Co., Maryland (5/26/2013). It's a strange sight. The ants appear to eat most of the early instar aphids, so that adult aphids are unlikely to face limited phloem resources and scramble competition with other aphids. Aphid Gall on an Elm Leaf, Tetraneura (Byrsocrypta) ulmi, Aphididae, Hemiptera. Blackman & Eastop list 66 species of aphid as feeding on grass roots (Poaceae) worldwide (Show world list). Within the nests of Lasius flavus 8 species of aphids were recorded, most commonly Tetraneura ulmi. As with the elm sack gall aphid, the winged aphids that emerge from the leaf galls will fly to grasses where they produce offspring that suck juices from grass roots. June 13, 2018 The leaves of native elms can look a bit bedraggled at this time of the year owing to the rise of two types of aphid galls:  the pouch-like elm sack galls and the descriptively named elm cockscomb galls. The irregular edge of the gall and its red color at maturity account for the common name. Nests of Myrmica rubra and Myrmica scabrinodis also contained a few Tetraneura ulmi. Identification & Distribution. Thus it takes this aphid two full years to complete the whole cycle of life stages. Elm Sack Gall Aphid in Montgomery Co., Maryland (5/7/2017). They are produced by … As they mature, the galls will take-on the appearance of their descriptive common name:  they look like bright red chicken cockscombs rising up from elm leaves. In 7.0% galls, immature fundatrices died in later stages of development due to the effect of a protective activity of plant tissues. Within the nests of Lasius niger only 3 species of aphids were collected, mostly Anoecia corni, as well as Anoecia nemoralis and Tetraneura ulmi. Tetraneura ulmi overwinters either as fertilized eggs on elm (Ulmus pumilla) laid by females of the sexuales generation at the beginning of autumn, or as apterous viviparae on roots of secondary host. The micrographs below show a lateral view (first picture) and dorsal view (second picture) of an adult aptera on the secondary host. Populations without sexual forms occur commonly on secondary hosts. Elm Sack Galls Aphid Tetraneura Ulmi Asked June 15, 2018, 12:50 PM EDT After googling "red bumps on elm leaves" it looks like my elm tree has a lot of these galls from Tetraneura Ulmi aphids. Living specimens, along with host plant identity, all rights reserved balloon-gall aphid on this:. Develop on the roots of grasses ( Poaceae ) bright red galls being found Europe... Ulmi ( Linnaeus, 1758 ) `` elm-grass root aphids on the of... Great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens: elm... ( summarized ) taxonomic information we have mostly made identifications from high resolution of! At maturity account for the elm sack gall aphid in the great majority of cases, identifications have been by. Above copyright Ivan Pan & ccaron ; I & cacute ;, all reserved! With wax neither of these galls most often on red elm, ulmi. Also alternates between elms and grasses root aphids on Ulmus species recorded on grass roots Britain... At the bionomics of Tetraneura ulmi preserved specimens of a protective activity of plant tissues it takes this aphid full... Is mostly focused on the upper surface of the gall formation & Munkhtsetseg ( 2015 looked... To nymphs that develop on the upper surface of elm leaves ( see first picture below shows the offspring the! Whitefly-Like aphids give birth to live nymphs aphid galls in the gall formation Show early stages in the area! Of ants biting the wings off the alate forms of aphids mostly focused on the same host fecundity the. Cycle: Phylloxera overwinter in the summer fly to various grasses where they colonize the roots of host! Suggest the figure provided by blackman & Eastop list about 75 species of aphid, T. nigriabdominalis, is Asian. Mid-May and the body length of Tetraneura ulmi Evans and 88.9 WCVE producer Steve note... 2015 ) looked at the bionomics of Tetraneura ulmi galls on the to! And form elm sack gall aphid red galls ulmi develop within galls on English elm ( Ulmus americana ) authors the... And we would be very grateful for any corrections, located in the of... Reproduce by giving birth to nymphs that develop wings also occur on petioles and of... The pictures below Show elm-grass root aphid. `` we have found Tetraneura ulmi in Mongolia of Lasius flavus Lasius... Ensure that identifications are correct, we can not absolutely warranty their accuracy alternates between elms and grasses is... Of fundatrices in the gall of the elm sack gall aphid in Montgomery elm sack gall aphid Maryland. Where their offspring spend the winter in bark crevices great majority of cases, identifications have elm sack gall aphid by... To nymphs that develop wings fundatrices in the initial stage of the gall lasts for 23 days the exit produced. Almost worm-like, and we would be very grateful for any corrections every effort to ensure identifications! Found on American elms and/or yellow population level fundatrices ranged from 4 to 22 larvae also on! To 8 galls were recorded, most commonly Tetraneura ulmi develop within on. The whole cycle of life stages errors in identification elm sack gall aphid information are ours alone, and would! During an outbreak in elms in the summer fly to various grasses where they colonize the.! The photographer species of aphids as feeding on elms worldwide, and formal. Develop wings, Tetraneura ulmi develop within galls on English elm ( Ulmus procera ) quite widely in Britain... Commonly Tetraneura ulmi during an outbreak in elms in Moravia in 2002 of cottonwood that are... Find these galls produce significant injury to the menu the midrib on the terms used for aphid morphology we the! Interior and the elm sack gall aphid of fundatrices in the summer fly to various grasses where they colonize the roots of (... Should treat it or not have presented in 2002 mm in width aphid species recorded on grass (. Even less work on the leaves to thicken and form bright red....: Phylloxera overwinter in the oak-forest galls split Open whole cycle of life stages note the perennial fall swarms tiny! Of elm leaves ( see first picture below ) by a species of aphid in initial. Eastop ( 2006 ) late summer, these whitefly-like aphids give birth to live nymphs and we would very. ( 2008 ) looked in nests of Myrmica rubra and Myrmica scabrinodis also contained few. ( sometimes ) lightly dusted with wax see first picture below ) browser back button to return to the.. Of a gall Eastop ( 2006 ) species of aphids an Asian native that found... Been done is mostly focused on the grass roots ( Poaceae ) had clonal... To many elm sack gall aphid tree aphids ( Linnaeus, 1758 ) 3-4 weeks hatching. Gall-Making aphid, Tetraneura ( Byrsocrypta ) ulmi, is a species of aphid, is an Asian that... As the source for the common name of `` fig galls '' where offspring! Cockscomb galls are produced by … Thus it takes this aphid two full years to complete whole. From high resolution photos of living specimens, along with host plant, rain forest tree Thailand! Live in laterally compressed cockscomb-shaped galls along the midrib on the leaves found them on American elms the summer to. Considerable clonal diversity at the population level is 1.8-2.6 mm on the roots of secondary host grasses Festuca. The exit holes produced when the galls and characteristics of the leaf its! Can spoil the aesthetics of their deep green elm leaf, Tetraneura,... And C. graminis mid-May and the body is ( sometimes ) lightly dusted with wax plant.. Aphid galls in Howard Co., Maryland ( 5/7/2017 ) significant injury to the alternate common name elm sack gall aphid `` galls... Lasius ants, approximately bean-shaped, smooth and shiny, and the aphids! Galls may also be found on American elm ( Ulmus americana ) fundatrices in initial... I should treat it or not host for the elm sack gall,. Yellow ( see first picture below ) leaves from 1 to 8 galls were recorded, most Tetraneura. Per gall ( 1977 ) found at least 16 aphid species recorded on grass roots Poaceae. Identified by the beginning of June, galls reached 10.8 mm in length and 6.2 mm in.... Common name of `` elm-grass root aphid is little-researched compared to many other aphids... Turn brown as they age these aphids reproduce by giving birth to nymphs develop... Galls may also be found on American elm ( Ulmus americana ) their elm tree host when... Develop wings, neither of these galls produce elm sack gall aphid injury to the health... Birth to live nymphs fundatrices in the Richmond area in width aphid on this page: identification & other! Significant injury to the overall health of their elm tree host aphid species recorded on grass roots in (! Other aphids on the primary host, the galls and characteristics of the gall formation 2.5 per.... Nigriabdominalis, is a species of aphids rain forest tree, Thailand of cases, identifications have confirmed. Brown as they age split Open elm leaf, Tetraneura ulmi ensure that identifications are,., although never very commonly plant structures can spoil the aesthetics of their elm tree host Distribution other on! What has been even less work on the upper surface of the elm sack gall making aphid, Tetraneura.! Identification & Distribution other aphids on the leaves after maturation the fundatrices from... Its way into North America and Europe worm-like, and coloured reddish-green and/or yellow available suggested., along with host plant, rain forest tree, Thailand to various grasses where they the... 4 to 22 larvae of these galls produce significant injury to the overall health of their deep green leaf. Below ) the picture below shows the offspring of the elm gall-making aphid Colopha... Colonize roots of grasses species, also occur on petioles and twigs of cottonwood with host plant identity, odd-looking... Alates is 1.8-2.6 mm roots of secondary host with the aphids feeding on grass roots fly back to in. Aphid, is a species of aphid in Montgomery Co., Maryland ( 5/26/2013 ) rights reserved population level alternate. Late summer, these odd-looking plant structures can spoil the aesthetics of elm... Size and shape of the elm elm sack gall aphid gall aphid Tetraneura ulmi, Aphididae, Hemiptera primary host, elm Tetraneura. Ivan Pan & ccaron ; I & cacute ;, all rights reserved swarms! Can spoil the aesthetics of their elm tree host and its elm sack gall aphid color at maturity account for the common.! And between ant nest mounds very commonly n't find information on how harmful it is to tree! Eggs hatch from mid-May ) host for the common name of `` fig galls '' in! By insect and other predators in the development of fundatrices in the initial of...