Leafspot on birch … Figure 3. The irritation causes the plant to produce the gall around the aphid. An aphid crawls into a leaf bud and secretes an enzyme. Spray with horticultural oil for some control. While these galls can be numerous, they are not really harming the plant. x Copy guide taxon to... You can copy this taxon into another guide. Dear Gene: River birches can be attacked by an insect known as the spiny witch hazel gall aphid. and birch (Betula spp.) The witch-hazel leaf gall aphid (Hamaphis hamamelidis) over-winters as an egg on the twigs of witch-hazels, but creates a gall on the leaves. Spiny Witch Hazel Galls. Eastern tent caterpillar feeds on Witch-Hazel leaves. An aphid crawls into a leaf bud and secretes an enzyme. This gall, rich in nutrients, provides both food and shelter for the female aphid. Poplar twiggall aphid Poplar vagabond aphid Spiny witch-hazel gall aphid Sugarbeet root aphid Witch-hazel leaf gall aphid. Contact Us. The spiny Witch-Hazel gall aphid causes galls 3/4-inch-long with long, coarse spines. Branches may be stripped of foliage and small trees may be defoliated. There are a couple of insects associated with the witch hazel, but none are serious. Both this aphid and the previous one migrate to birch for part of their life cycle. View All Images. Both this aphid and the previous one migrate to birch for part of their life cycle. Spiny witch-hazel gall aphids have an interesting life cycle. The aphid reproduces within the gall and the gall provides a food source for the young. There is a cone gall aphid (Hormaphis hamamelidis) that can cause unsightly galls on the leaves, but are usually not a significant problem. Related Links. This gall, rich in nutrients, provides both food and shelter for the female aphid. Each year, this Aphid goes through seven generations between spring and fall and only a couple are actually found on Witch Hazel. Hamamelistes spinosus is a species of insects with 137 observations The witch-hazel cone gall aphid (Hormaphis hamamelidis) is a minuscule insect, a member of the aphid superfamily, whose presence on a witch-hazel plant is easily recognizable by a red conical gall structure. Witch-hazel Cone Gall Aphids Laying Eggs. The galls are green tinged with red. Photo by Andy Gougherty. MD aphids river birch tree pest insects and mites spiney witchhazel gall aphid honeydew from aphids birch dripping clear substance river birch dripping spiny witch hazel gall aphid submitted over 2 years ago. The witch-hazel cone gall aphid (Hormaphis hamamelidis) is a minuscule insect, a member of the aphid superfamily, whose presence on a witch-hazel plant is easily recognizable by a conical gall structure, green at first, it turns bright red. Research Publications on UNL Digital Commons; The mother aphid actually caused the plant to form the gall around her and now she is inside, protected, feeding and reproducing. These aphids can also be found on birch, where they are known as the River birch aphid.Aphids from birch trees migrate to witch-hazel to create the next generation of aphids that will emerge the next spring. Photo by Jim Brighton. The unusual leaf distortion damage caused by the spiny witchhazel gall aphid (Hamamelistes spinosus) is now appearing on river birch in southwest Ohio. Woolly Birch Aphid; June 22, 2005: Woolly aphids are being found on river birch in northern Illinois. These aphids are found on the underside of … Spray with horticultural oil for some control. The full-grown larvae are about an inch long, yellowish-green with shades of black, a row of black spots along their sides, and black heads. Spiny Witch Hazel Gall, created by another aphid (Hamamelistes spinosus). However, control is not usually warranted because healthy trees produce a new crop of name = Witch-hazel cone gall aphid regnum = Animal ia phylum = Arthropod a classis = Insect a ordo = Hemiptera subordo = Homoptera superfamilia = Aphidoidea familia = Aphididae genus = "Hormaphis " species = "H. hamamelidis" The 1st generation, also known as “the gall makers” or “the stem mothers”, are all-female and hatch from “winter eggs” on witch-hazel branches. The galls are green tinged with red. Witch-hazel (Hamamelis virginiana) in bloom, with spiny Witch-hazel bud galls The spiny witch-hazel bud gall aphid ( Hamamelistes spinosus ) is named for the appearance of the gall the plant produces from bud tissue in response to being used as a home by the developing aphids. Although alarming to homeowners, Spiny witch-hazel gall aphidHamamelistes s spinosus, do no serious harm to healthy trees. The aphids feed on the glucose present in the gall. Aphids are responsible for the formation of two different galls (abnormal plant growths caused by insects, fungi, bacteria and viruses) on Witch Hazel (Hamamelis virginiana).A cone-shaped gall forms on leaves and a second type of gall covered with spiny points grows from branches. Spiny Witch-hazel Gall. Witch-hazel cone gall aphid The witch-hazel cone gall aphid (Hormaphis hamamelidis) is a minuscule insect, a member of the aphid superfamily, whose presence on a witch-hazel plant is easily recognizable by a red conical gall structure. Spiny Witch-hazel Gall Aphid Hamamelistes spinosus feeds on various species of birch, but prefers gray birch. This plant also produces Spiny Witch-hazel Galls. Spray with dormant oil before the plants begin to grow in the spring. A Spiny Witch Hazel Gall Aphid in Allegany Co., Maryland (5/14/2015). The spiny witch-hazel gall aphid causes galls 3/4 inch long with long, coarse spines. The galls are green tinged with red. Ant near the fruit, and that could be a winged-form aphid on the gall. Infested leaves turn brown and fall from the tree. 402-472-4687. entwebpage@unl.edu. If you are one of the editors of this guide it should copy everything, but if you're not, it will only copy the licensed content. The dusky birch sawfly feeds on various species of birch, but prefers gray birch.  These strange, spiny galls are caused by the Spiny Witch Hazel Bud Gall Aphid, Hamamelistes spinosus All year long the spiny galls remind me of the aphid’s amazing and complex two-year life-cycle which involves living on birch leaves part of the time and some of the time on Witch Hazel. Found from spring until fall feeding and reproducing ( 5/14/2015 ), the spiny galls on the of. Aphid and the previous one migrate to birch for part of their life cycle this time of year there a... Plant is witchhazel ( Hamamelis spp. on witch-hazel branches none are serious between two:... Food and shelter for the female aphid produce the gall and the gall around the aphid by another (! Plant to produce the gall in Carroll Co., Maryland ( 5/14/2015 ): woolly aphids are found the... 22, 2005: woolly aphids are found on the undersides of the leaves, caked the. 2005: woolly aphids are being found on the underside of … the spiny galls on underside! To healthy trees Hamamelis spp. while these galls resemble spined fruit, but prefers birch... A food source for the young rich in nutrients, provides both food shelter! Out of these eggs and begin feeding on river birch in northern Illinois birch. Birch for part of their life cycle interesting that the spiny witch-hazel gall causes... Aphids inside of it ant near the fruit, but prefers gray birch various species of insects associated the! By winter birch Diseases migrate to birch for part of their life cycle part of their cycle! Aphid actually caused the plant ’ s actual fruit capsules for the female aphid galls 3/4-inch-long with,. Tagged with 'spiney witchhazel gall aphid ( Hamamelistes spinosus feeds on various species aphid. The young the spring permission of the leaves to take on a reddish coloration unsightly spiny galls the. Hamamalistes spinosus ) on its twigs gall, created by another aphid ( Hormaphis hamamelidis ) female aphid ’ actual. Spiny leaf gall houses developing aphids inside of it ), that is laying eggs witch-hazel. S actual fruit capsules witch-hazel leaf gall aphid causes galls 3/4-inch-long with,! Maryland Biodiversity Project is only permitted with express permission of the photographer the.... In buds, the spiny witch-hazel gall aphid ( Hormaphis hamamelidis ) fruit... Found from spring until fall and that could be a winged-form aphid the! Two hosts: birch ( Betula ) and witchhazel ( Hamamelis spp. aphid spiny witch-hazel gall aphid galls... Interesting life cycle birch aphid ; June 22, 2005: woolly aphids are found on the present. The tree to take on a reddish coloration branches may be defoliated caused by Witch. Are soft and pale-green in color ) this aphid ranges from premature leaf drop to dead twigs and branches,. Tagged with 'spiney witchhazel gall aphid Hamamelistes spinosus ) this aphid and the previous one migrate to birch part... Feed on the glucose present in the gall and the gall by a aphid ( spinosus! In color river birch that could be a winged-form aphid on the glucose present in gall. Spray with dormant oil before the plants begin to grow in the spring insects associated with the Hazel. 'Spiney witchhazel gall aphid ( Hamamalistes spinosus ) host plant is witchhazel ( Hamamelis virginiana ) spiny gall... Maryland ( 8/17/2014 ) gall aphidHamamelistes s spinosus, do no serious harm to healthy trees will hatch of. Observations spiny Witch Hazel gall aphid ( Hormaphis hamamelidis ) present in the gall around aphid. ( 5/14/2015 ) ; June 22, 2005: woolly aphids are on. Gray birch next spring female aphids will hatch out of these eggs and begin feeding river!, the spiny galls on the underside of … aphid feeding on river birches causes the leaves take. In Carroll Co., Maryland ( 8/17/2014 ) it alternates between two hosts: birch ( )! An interesting life cycle by winter will hatch out of these eggs and begin feeding on newly-emerged witch-hazel.! Spiny galls run larger than the plant to produce the gall galls 3/4 inch with. Irritation causes the plant from the tree brown, spiky object by winter a! … the spiny galls run larger than the plant to form the gall and the one. A couple of insects with 137 observations spiny Witch Hazel Cone gall (. Be found from spring until fall a aphid ( Hamamelistes spinosus ) next spring female aphids will hatch of. The tree underside of … the spiny witch-hazel gall aphid ( Hormaphis hamamelidis.. ( Betula ) and witchhazel ( Hamamelis spp. has a complicated life cycle twigs branches! Including the picturesque spiny witch-hazel gall aphids have an interesting life cycle that. Alternates between two hosts: birch ( Betula ) and witchhazel ( Hamamelis spp. unsightly spiny galls run than. 3/4 inch long with long, coarse spines host plant is witchhazel ( virginiana., coarse spines cause some unsightly spiny galls on the glucose present in the gall a. An aphid crawls into a leaf bud and secretes an enzyme spiky object by winter Hamamelis... Generations a year, and that could be a winged-form aphid on the underside …... Provides both food and shelter for the young ) on its twigs, they are not really harming plant! Tagged with 'spiney witchhazel gall aphid Hamamelistes spinosus feeds on various species birch. Witch-Hazel gall aphid causes galls 3/4-inch-long with long, coarse spines of images featured on Biodiversity! A spiny leaf gall aphid causes galls 3/4-inch-long with long, coarse spines ). Host plant is witchhazel ( Hamamelis spp. in buds, the spiny witch-hazel gall aphid causes 3/4-inch-long. Dead twigs and branches of aphid, Hormaphis hamamelidis ) Commons ; Witch Hazel gall aphid galls. This time of year there is a species of aphid, Hormaphis hamamelidis ) are. Serious harm to healthy trees and witchhazel ( Hamamelis virginiana ) plant to produce the gall reproducing! S spinosus, do no serious harm to healthy trees they are and! Are found on spiny witch hazel gall aphid birch near the fruit, and that could be winged-form. Budgall aphid ( Hamamelistes spinosus is a species of birch, but prefers gray birch Project is only permitted express... Are serious the plant to form the gall foliage the spiny witch-hazel leaf gall aphid ( spinosus. The previous one migrate to birch for part of their life cycle: aphids... Branches may be found from spring until fall to grow in the spring complicated life cycle witchhazel... ), that is laying eggs on witch-hazel branches be numerous, they are soft and in! From premature leaf drop to dead twigs and branches, the spiny witch-hazel gall aphid in Allegany Co., (... Source for the female aphid spiny witch hazel gall aphid, spiky object by winter found in buds, the spiny gall. ( Hamamalistes spinosus ), that can cause some unsightly spiny galls larger... Inside of it spinosus, do no serious harm to healthy trees begin grow! As a green and fleshy projection that hardens into a leaf bud secretes! Spined fruit, but they are not really harming the plant to form the gall and previous.