), and among the birches it has a particular affinity for river birch (Betula nigra), hence the aphid’s common name, "river birch aphid.” I took a leaf to the nursery where I bought the tree and they sold me an insecticide to spray on it. Caring for Your Birch Tree. It starts as a green and fleshy projection that hardens into a brown, spiky object by winter. If the plant turns out to be heavily infested it’s best to get rid of it. This aphid is a common pest on birch, particularly river birch. Aphid eggs are tiny, but they lay them in bunches so they should be visible as small white flecks. The Division of Forestry promotes and applies management for the sustainable use and protection of Ohio’s private and public forest lands. Although birch trees are prized throughout our landscapes for their aesthetic appeal, they are also notorious for providing a banquet for aphids. White Birches are not really water-loving trees like a River Birch, nor are they very tolerant to drought. It looks like some time of larvae perhaps? 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. In most of Iowa, it is the only birch which should be planted for ornamental purposes. The aphids become active in the spring when the leaf buds are opening. However, the common pest on birch, particularly river birch right now, is the Spiny Witch-hazel Gall Aphid Hamamelistes spinosus. All of my birch trees, which include river birch and white spire, are well established and are all at least 15 years old. Prune A River Birch Tree. A severe infestation can cause leaf drop and branch dieback. The Fox Valley ® river birch is a Chicagoland Grows ® introduction that demonstrates resistance to bronze birch borer (BBB). River Birch Aphid. Aphid populations can explode very quickly; a female can give birth to up to 12 live young a day and it only takes 7 to 8 days for a nymph to become a reproducing adult. Those with low susceptibility (more resistant) include heritage birch, heritage river birch (B. nigra 'Heritage'), river birch and red birch (B. nigra). I've got something going on in my River Birch tree that I've never seen before. How to Get Rid of & Treat Aphid Infestations in Large, Tall Trees August 21, 2018. Dark green foliage turns a beautiful buttery yellow in the fall. It has a complicated life cycle in that it alternates between two hosts: birch (Betula) and witchhazel (Hamamelis spp.) ... squash, and tomatoes. Woolly Birch Aphid; June 22, 2005: Woolly aphids are being found on river birch in northern Illinois. The aphid is sometimes called the "river birch aphid" owing to its affinity for B. nigra. witchhazel gall aphid on birch. Attractive salmon-pink to reddish-brown bark exfoliates to reveal lighter inner bark. Learn about river birch, also called black birch or red birch, many cultivars of graceful, fast-growing, upright, open, deciduous trees of wetland forests. A few aphids can be dealt with, but you need to be thorough or the result could be disaster for your whole garden. The specific type of aphid that feeds on river birch foliage is known as the spiny witch-hazel gall aphid. The aphids are found on the undersides of the leaves, caked into the corrugations with a white granular material. Aphids love River Birch. It appears that your river birch is infected with the spiny witchhazel gall aphid (Hamamelistes spinosus).During its life cycle the aphid alternates between two hosts: witch hazel (Hamamelis spp.) Spiny witch-hazel gall aphids have an interesting life cycle. This species, Hamamelistes spinosus, causes the leaves of River Birch (Betula nigra) to pucker and distort. At the start of spring, females or stem mothers crawl to leaf buds. It's getting to where I dread staying on the back deck for any length of time. Once aphids hatch on birch foliage their populations quickly explode. Witch Hazel Cone Galls. The yellowish birch aphid, Calaphis betulaecolens, and the waxy birch leaf aphid,. In the spring, this aphid feeds on river birch leaves. This document describes river birch aphids, their biology, and control. Found in buds, the Spiny witch-hazel leaf gall houses developing aphids inside of it. Chlorosis develop in High pH situations. You will also find aphids on roses and hydrangeas, and trees like ash, birch, elm, linden, maple, oak, and walnut. River birch is a popular, fast-growing native tree for the home landscape. Some of the most common are: Bronze Birch Borer – This potentially lethal pest can be difficult to control in birch trees. and birch (Betula spp.) witchhazel gall aphid on birch. Aphid numbers expand quickly with each succeeding generation contributing to an ever-expanding aphid population. The River Birch appears very similar to the White Birch varieties, with the main distinction being the color of the bark. European Birch Aphid and the Common Birch Aphid – Aphids suck the sap out of the birch tree leaves causing them to yellow and twist. Landscape planted R. Birch are probably more susceptible to problems as there might be excess fertilization, irrigation, compaction, or other factors that can contribute to a … Aphid feeding on river birches causes the leaves to take on a reddish coloration. Prone to aphid and caterpillar infestation. The aphids were damaging the birch tree leaves and staining her concrete from the honeydew. Often grows … The aphids become active in the spring when the leaf buds are opening. It has a complicated life cycle in that it alternates between two hosts: birch (Betula) and witchhazel (Hamamelis spp.) I live in north Georgia. 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