However, the common pest on birch, particularly river birch right now, is the Spiny Witch-hazel Gall Aphid Hamamelistes spinosus. The specific type of aphid that feeds on river birch foliage is known as the spiny witch-hazel gall aphid. My river birch has an aphid and after doing some research, it is apparently Spiny Witch-hazel Gall Aphids. Aphid eggs are tiny, but they lay them in bunches so they should be visible as small white flecks. It has a complicated life cycle in that it alternates between two hosts: birch (Betula) and witchhazel (Hamamelis spp.) Injury from this aphid ranges from premature leaf drop to dead twigs and branches. European Birch Aphid and the Common Birch Aphid – Aphids suck the sap out of the birch tree leaves causing them to yellow and twist. It has a complicated life cycle in that it alternates between two hosts: birch (Betula) and witch hazel (Hamamelis spp.). Spiny witch-hazel gall aphids have an interesting life cycle. Home; How to Get Rid of & Treat Aphid Infestations in Large, Tall Trees If the plant turns out to be heavily infested it’s best to get rid of it. This species is resistant to bronze birch borer (BBB). Honeydew is a sticky black liquid, secreted by aphids as they feed on plant sap. Although birch trees are prized throughout our landscapes for their aesthetic appeal, they are also notorious for providing a banquet for aphids. Woolly Birch Aphid. trees. The bark of the river birch is very distinctive, thus making it a favored ornamental tree for landscape uses. At the start of spring, females or stem mothers crawl to leaf buds. I took a leaf to the nursery where I bought the tree and they sold me an insecticide to spray on it. Aphid numbers expand quickly with each succeeding generation contributing to an ever-expanding aphid population. It is a dense, compact tree with glossy green leaves and exfoliating bark. It's getting to where I dread staying on the back deck for any length of time. ), and among the birches it has a particular affinity for river birch (Betula nigra), hence the aphid’s common name, "river birch aphid.” They alternate between witch-hazel (Hamamelis spp.) The aphids are found on the undersides of the leaves, caked into the corrugations with a white granular material. Notable Traits: Native to eastern United States. This species, Hamamelistes spinosus, causes the leaves of River Birch (Betula nigra) to pucker and distort. 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. Prone to aphid and caterpillar infestation. 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. It looks like some time of larvae perhaps? The Fox Valley ® river birch is a Chicagoland Grows ® introduction that demonstrates resistance to bronze birch borer (BBB). Various leaf miners and aphids may infest it, but these problems are unimportant. While less sugary, the birch … Even in a native setting, this is the case. In the spring, this aphid feeds on river birch leaves. The aphids were damaging the birch tree leaves and staining her concrete from the honeydew. Those with low susceptibility (more resistant) include heritage birch, heritage river birch (B. nigra 'Heritage'), river birch and red birch (B. nigra). Attractive salmon-pink to reddish-brown bark exfoliates to reveal lighter inner bark. The Division of Forestry promotes and applies management for the sustainable use and protection of Ohio’s private and public forest lands. Injury from this aphid ranges from premature leaf drop to dead twigs and branches. Woolly Birch Aphid; June 22, 2005: Woolly aphids are being found on river birch in northern Illinois. Landscapers have moved to using River Birches because of better resistance to certain insect problems. Aphids love River Birch. One aphid causes the leaves to crinkle in the spring. However, they typically occur late in the season and most are not significantly detrimental. Found in buds, the Spiny witch-hazel leaf gall houses developing aphids inside of it. The aphids become active in the spring when the leaf buds are opening. The aphids become active in the spring when the leaf buds are opening. Wants moisture. and birch (Betula spp.) 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. Woolly Alder Aphid; Walking Stick; Yellowbellied Sapsucker; Spiny Elm Caterpillar A few aphids can be dealt with, but you need to be thorough or the result could be disaster for your whole garden. 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