However, this scale has a different host range that is not known to overlap with that of crapemyrtle bark scale. Eggs are laid in the spring and hatch from late-June to mid-July. Azalea bark scale Photo: United States National Collection of Scale Insects Photographs, USDA Agricultural Research Service, Bugwood.org Eriococcus azalea (soft scale) produces a white eggsac full of eggs. The azalea bark scale has been reported from andromeda, four azalea species, blueberry,"flowering cherry," hawthorn, huckleberry, poplar, rhododendron, and willow. Azalea Bark Scale, Erlococcus azalene. Cottony masses of the scales are often located on twigs and in the forks of the branches. These mobile immatures are known as "crawlers". Introduced into the San Francisco area in the early 1900’s, it has continued to spread throughout the Pacific Coast states and several eastern states, including Pennsylvania, Maryland, Delaware, Virginia, and Long Island. ⅛” oval to oblong white scale covering the bark on crape myrtle trunks and branches (similar to azalea bark scale). Sticky honeydew is excreted by the pests, and may have black sooty mold growing on it. All types of fruit and ornamental trees, shrubs. In spring they produce eggs beneath their body then die. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. These hatch around late June through July and the crawlers settle in bark crevices, on leaves, or twig forks and pass through several stages. Red females cover themselves and their eggs with a white, waxy, protective coating. The adult female azalea bark scale is dark red with a long sucking mouthpart. Azalea bark scale : Azalea lace bug : Azalea leafminer : Obliquebanded leafroller : Root weevils : Spider mites : print version| pdf version| email url : Caption: ALB damage and tar spots on azalea. azalea bark scale Eriococcus azaleae (Comstock) About This Subject; View Images Details; View Images; Selected Images. Management Options. azalea bark scale on 'Nannie Angell' Casio QV-2900UX,scale 0205090004.s.JPG 1/1493s f/3.2 at 7.0mm hide exif. Symptoms of their sucking include honeydew, sooty mold, and considerable leaf yellowing and die back. Hosts: azalea, rhododendron, Andromeda, hawthorn, poplar, and willow Starting the last week of June to early July Table 1. Azalea bark scale overwinters as nymphs or adults in the northeast, laying up to 250 eggs in spring. The Interactive Plant Manager is here to help you diagnose, monitor, treat, and prevent pest problems. To reduce chances of bark-splitting, plant only azalea varieties known to be hardy in your area. Azalea bark scale (Eriococcus azaleae) Lecanium scale (Lecanium spp.) For biology, life history, monitoring and management. Residential Recommendations Skip to Residential Recommendations. Pest description and crop damage Lecanium scales overwinter on twigs and branches under a hard, helmet-like, reddish-brown covering, which is about 6-8 mm in diameter. This insect produces a white or cottony sac that is often found attached in the axils of twigs and leaves during May to June and September through October. It is hidden from view by the matted waxy threads of the egg sac that covers it. Azalea bark scale insects (Eriococcus azaleae Comstock), discovered in the United States in 1881, have earned a reputation as significant azalea pests. However, this scale has a different host range that is not known to overlap with that of crapemyrtle bark scale. If Azalea Bark Scale, the vulnerable stage (called "crawlers") tend to appear around late May to early June (on average, in our area) and again in mid-July. Video shows close ups of Azalea Bark scale and provides some plant inspection tips. If necessary, apply a dormant spray for overwintering nymphs on twigs. Treating Azalea Bark Scale . They appear to be most active during the summer. This scale lives and thrives on crape myrtle, suggesting a different identity for it. Blackened branches made so by honeydew and mold, eventually sicken and die, as does the female when her egg sac is full. Invasive Listing Sources. They have at least 2 overlapping generations. Putnam scales are small (1-2 mm at maturity) (Figure 6) and have a flattened, plate-like cover that can be removed to reveal the insect underneath. Control: If the population is low and damage is minimal, look for beneficial insects which do a good job controlling this insect. A: That crusty growth might look like a fungus or mold, but it’s actually a bug called azalea bark scale. The azalea bark scale is in the same genus (Acanthococcus) as crapemyrtle bark scale and appears virtually identical. See: Azalea (Rhododendron)-Azalea bark scale. Azalea bark scale shown on an azalea also may be found on rhododendrons. The azalea bark scale is tiny, but her effect, as seen on your azaleas turning black, is terrible. Crawler activity for azalea bark scale was similar to wax scale noted above at the same location in 2014. Azalea Bark Scale is common in eastern parts of the United States. Scale Download a PDF of this article Plants Affected. The most likely culprit is a scale insect found in China, Japan, and Korea. This pest overwinters as a nymph (immature). Crapemyrtle bark scale, Acanthococcus lagerstroemiae (Kuwana), infesting young crapemyrtle branches. Calico scale, Eulecanium cerasorum is a pest of variety woody plants. Photo by: J. Para obtener la versión en español de esta hoja informativa, HGIC 1059S, El Cuidado de las Azaleas. Azalea bark scale overwinters as immatures in the forks of the twigs. the azalea bark scale, had begun attacking a new host plant or if this was a newly introduced species. When first discovered in the United States, this insect was identified as the azalea bark scale (Eriococcus azalea); however, crape myrtle has never before been reported as a host plant for azalea bark scale. Non-Chemical Management. Azalea bark scale is most easily recognized by the white cottony sacs (Figure 4) that protect the developing pink eggs underneath (Figure 5). Glass : Azalea : Azalea lace bug (revision date: 2/14/2019) Use Integrated Pest Management (IPM) for successful plant problem management. The crawlers like to attach to the bark and feed in crevices and branch forks. Scales are so unusual looking that most people don’t recognize them as insects. In summer when crawlers are active, you can use a summer rate (0.5 – 1.0%) of horticultural oil. This is a pest that generally does not kill hosts, rather it causes aesthetic damage. Can I use Pivot 10 for azalea bark scale? Eriococcus azaleae. The most likely culprit is a scale insect found in China, Japan, and Korea. Regularly check your plants for signs of infestation. The adult females (1/8 inch) with their white egg sacs are most noticeable in May and June. Females are approximately 1/8-inch long and covered with a white, waxy egg sac. Azalea bark scales overwinter on older twigs and branches, under a white, felt-like egg sac about 6-12 mm in diameter. They produce large amounts of honey dew, resulting in black, sooty mold fungus. To get started, just select from ONE OR MORE of the following fields and press ?Search? For example, it does not feed on crapemyrtle and is primarily a pest on azaleas (Rhododendron species). Nonnative Invasive Species in Southern Forest and Grassland Ecosystems; Taxonomic Rank. azalea bark scale Stelloh garden, Hendersonville NC . lea bark scale (Eriococcus azalea); however, crape myrtle has never before been report-ed as a host plant for azalea bark scale. By 2014, DNA and morphological tests helped scientists identify this species as Acanthococcus (=Eriococcus) lagerstroemiae, a felt scale from Asia that was known to feed on crapemyrtle species. Symptoms/Damage. Damage - Since its discovery in 1881, the azalea bark scale has become recognized as a prominent pest of azaleas. Lecanium scale found on woody plants such as azaleas and rhododendrons. Hosts include andromeda, azalea, rhododendron, hawthorn, poplar, willow, and most recently blueberries. Cottony maple/taxus scale? As this azalea pest feeds, she secretes a honeydew along the azalea. Host Plants - The azalea bark scale has been found on four azalea species, rhododendron, "flowering cherry," and huckleberry . Recognition and Life Cycle. Azalea caterpillars can quickly defoliate a plant. Adult females are immobile and can usually be found feeding in the forks of branches and on twigs. Leafminers may be seen on the upper or lower leaves and cause yellowing or browning on the leaves. Would Captain Jacks Deadbug Brew Concentrate be effective for treating Azalea Bark Scale? For example, it does not feed on crapemyrtle and is primarily a pest on azaleas (Rhododendron species). Crape myrtle bark scale is a felt scale related to azalea bark scale and oak eriococcin scale. Examples include brown soft scale, lecanium scale, azalea bark scale, magnolia scale and tuliptree scale. As they mature, the adult females lay eggs, which when smashed, produce a pink-purple residue. The egg sac is about 1/8 inch in length. Females cover themselves with wax and eggs, crawlers and females beneath the wax are reddish. The azalea bark scale is in the same genus (Acanthococcus) as crapemyrtle bark scale and appears virtually identical. See "Scale insect" in: Common Landscape Pests Azalea bark scale is a third insect pest of azalea. Infested azaleas usually appear chlorotic, and severe infestation of azalea bark scale can weaken or kill your azaleas. This can cause a sooty mold, or white cottony masses to cover the plants. Female scales produce fluffy white filaments that cover their body. ).It has been reported in the Eastern US, as well as Belgium and Russia. This sap-sucking scale can cause serious harm to your favorite Azalea or Rhododendron. Control As there are so many different types of scales and the amount of damage depends on the level of infestation as well as the plant species and natural predators present in the environment, management should be customized to the situation. The azalea bark scale is a soft scale resembling mealybugs. Azalea bark scale (Acanthococcus azaleae) infestations can be severe. Biology. Crapemyrtle bark scale was first observed feeding on crapemyrtle in Richardson, Texas, a Dallas suburb in 2004. Chemical control of the azalea bark scales and their eggs in the ovisacs is difficult with insecticide sprays. Cut away and destroy affected parts. When numbers are high, they appear crust-like. What is the ratio of Hi-Yield 55% Malathion Insecticide Spray to kill mulberry caterpillars? Other pests that affect the azalea include bark scale or leafminers. BIOLOGY Distribution - The azalea bark scale occurs in the eastern United States; it has also been reported in Belgium, Germany, and Russia.. Photograph by Jim Robbins, University of Arkansas, CES, Bugwood.org. This scale lives and thrives on crape myrtle, suggesting a different identity for it. Will Zylam Liquid Systemic Insecticide work on the Crape Myrtle Bark Scale? 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