Azalea lace bugs feed on leaves, creating speckled areas on the leaf surface. Unhealthy and weak plants sustain more injury from scale insects than strong plants. Many of these insects also cause damage to azalea and mountain laurel. The discussion of the following insects will focus on recognition and life cycles, damage, monitoring and control options. As this azalea pest feeds, she secretes a honeydew along the azalea. Oystershell scale Lepidosaphes ulmi (L.) Magnolia scale, Neolecanium cornuparvum (Thro. ) It is by United States National Collection of Scale Insects Photographs at USDA Agricultural Research Service. If large numbers are present, they may stunt or cause dieback on plants. Scale Download a PDF of this article Plants Affected. Up close, the azalea bark scale-insect is white to gray in color. The white cotton-looking insects show up in limb and twig crotches. Azalea Bark Scale (Acanthococcus azaleae) Family Erioccicdae Plants Damaged: This scale is a pest of azaleas and rhododendrons. Dimethoate (Cygon) can be used. Crapemyrtle bark scale and azalea bark scale are felt scales. (Photo by United States National Collection of Scale Insects, USDA Agricultural Research Service, Bugwood.org) Crapemyrtle bark scale has been confirmed in Alabama Common Insect Pests of Rhododendron. The azalea bark scale has been recorded in the eastern United States and also in Belgium, Germany, and Russia. Scales: Several species of scale insects feed upon the rhododendron complex. Azalea bark scale (Eriococcus azaleae) Lecanium scale (Lecanium spp.) Symptoms/Damage. Azalea bark scales overwinter on older twigs and branches, under a white, felt-like egg sac about 6-12 mm in diameter. Females cover themselves with wax and eggs, crawlers and females beneath the wax are reddish. Many homeowners confuse honeydew with sap. This scale lives and thrives on crape myrtle, suggesting a different identity for it. Azalea Bark Scale (Erlococcus azalene) Recognition and Life Cycle Females are approximately 1/8-inch long and covered with a white, waxy egg sac. Both adults and nymphs cause damage by sucking juices from the under-side of the leaves. Hosts: azalea, rhododendron, Andromeda, hawthorn, poplar, and willow Starting the last week of June to early July Table 1. Azalea bark scales cause yellowing and a soot or mold appearance on stems. The oil coats the scale insects and clogs their breathing pores, suffocating them. It affects rhododendron family plants, including azaleas. Figure 22. Why Are My Crepe Myrtle Stems and Leaves Turning Black? Damage Symptoms: Azalea bark scale has become recognized as a prominent pest of azaleas. Scale insects can overwinter as nymphs or eggs tucked away in tree bark. Includes. Scale insects Usually found on twigs or branches. Collector: R.J. Gill et al. Trees do not drip sap. Blackened branches made so by honeydew and mold, eventually sicken and die, as does the female when her egg sac is full. Leaves and limbs may feel sticky from byproducts of the insect’s feeding. Categories. The azalea lacebug, Stepha- nitis pyrioides Scott, (Fig. Members of the rhododendron family, azaleas are hardy flowering shrubs with large, colorful flowers. Symptoms of their sucking include honeydew, sooty mold, and considerable leaf yellowing and die back. European elm scale, Gossyparia spuria (Modeer) Beech bark scale, Cryptococcus fagi (Baer.) 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. But they’re all sap-sucking invaders who can spread a wide variety of plant diseases, and nobody wants to discover them on their plants! Pest Control for Azaleas. Azalea Bark Scale. See: Azalea (Rhododendron)-Azalea bark scale. Rhododendron scales feed on the sap of the plant. These include Lecanium scale, oystershell scale, azalea bark scale, and several unknown species. The azalea bark scale is tiny, but her effect, as seen on your azaleas turning black, is terrible. Azalea lace bug (Stephanitis pyrioides) is an introduced insect. Print Image. Scale insects are major pests on ornamental trees, orchards, indoor plants and even ferns. See "Scale insect" in: Common Landscape Pests Cottony azalea scale is another soft scale insect that is most commonly found here in the Northeast on rhododendrons, azaleas and Pieris species. Leaves and limbs may feel sticky. Whether flat against leaves or fruit, or lumpy bumps on branches or stems, this widespread superfamily of insects is well over 8000 species strong. Azalea bark scale insects (Eriococcus azaleae Comstock), discovered in the United States in 1881, have earned a reputation as significant azalea pests. In fact, crapemyrtle bark scale was initially thought to be this insect. Host Plants: – These insects have been found on more than twenty different plant species including blueberry, andromeda, arborvitae, azalea, hackberry, hawthorn , maple, poplar, rhododendron, sweetgum and willow. … Its common name comes from the raised network of veins on its clear, hardened forewings. Oyster-shell scales appear, as the name depicts, as small, hard oystershells on the bark. Scale. 1) is a major pst ! Azalea bark scale ( Eriococcus azaleae) Comst. 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. Adults are 4–6mm long, and mottled black and tan. Fletcher scale, Lecanium fletcheri Lecanium sp. Ew, scale insects! Malathion or acephate (Orthene) can be used as spray during crawler stage. Fiorinia hemlock scale, Fiorinia externa Ferris Scurfy scale, Chionaspis furfura ( Fitch) Oleander scale, … Image 5119028 is of azalea bark scale (Eriococcus azaleae ) adult(s) on willow. Lace bugs/Spider mites. This application will smother the scale before the insects have a chance to form their protective coating. This sap-sucking scale can cause serious harm to your favorite Azalea or Rhododendron. Like soft scales, these secrete honeydew, so sooty mold is often seen when felt scales infest a plant. One of the first signs of an azalea bark scale infestation is a black (sooty mold) coating that appears on the bark of the trunk and on the branches of crape myrtles (see picture). The insects appear as white, waxy encrustations. Some common species of scale insects in Australia are pink wax scale, black scale, soft brown scale and citrus red scale. )f azaleas. Scale produces a waxy coating that makes them difficult to kill. The "bumps" may be brown or marbled brown and white. Soft scale insects typically have one generation per year and generally are larger in size though there are many variations in size, shape and color (figure 4). Rhododendron Borers and Rhododendron Stem Borers The discussion of the following insects will focus on recognition and life cycles, damage, monitoring and control options: Azalea Bark Scale, Erlococcus azalene. “One of the first signs of an azalea bark scale infestation is a black (sooty mold) coating that appears on the bark of the trunk and on the branches of crape myrtles. Posted by Mr. Chris Brewer. Loading... Autoplay When autoplay is enabled, a suggested video will automatically play next. This scale has been reported on hawthorn, Andromeda, poplar, willow and ornamental cherry trees. For biology, life history, monitoring and management. Azalea Bark Scale Symptom – Honeydew: Honeydew is the excrement of plant-sucking insects such as Azaela bark scale. Scale insects appear as small raised bumps on the twig or leaf. Azalea bush attacked by lacebug. Peony Scale Azalea Whitefly Azalea Leaf Miner Red Mite (Spider) Yellow Mite----- Leaf ... AZALEA INSECTS Azalea Lacebug Importance and Type of Injury. To treat, eliminate the insects and prune any dead or dying parts of the plant. Treating Azalea Bark Scale. Insects | Tree Care | Aphids | Azalea Bark Scale | Black Sooty Mold | Honeydew | Crepe Myrtles. A more complete list of azalea problems is at azalea diagnosis. Small infestations may be scraped off and discarded. Azalea bark scale is most easily recognized by the white cottony sacs (Figure 4) that protect the developing pink eggs underneath (Figure 5). It's important to treat the entire plant, as scale can be present on stems, the undersides of leaves, and along the base of the plant. The adult females (1/8 inch) with their white egg sacs are most noticeable in May and June. Scales are so unusual looking that most people don’t recognize them as insects. Date of photograph or collection: 04/07/1980 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. Rhododendron scale disease is actually caused by an insect, Eriococcus azaleae, commonly called azalea bark scale. Azalea bark scale is a species very similar in appearance to crapemyrtle bark scale. Nymphs (juveniles) are similarly coloured, but smaller and spiny in appearance, and they undergo a number of moults before they reach maturity. When numbers are high, they appear crust-like. Bark scales. Azalea Bark Scale. Some look like bits of white cotton; others are brownish. The azalea bark scale is a closely related species, but it has not been observed infesting crape myrtles. The new scale insect may be Eriococcus lagerostroemia, which feeds on Lagerostroemia indica in Japan and China. Scale insects extract nutrients from plant tissue. Azalea bark scale insects produce a white, felted covering for their eggs. Infested plants usually appear chlorotic and unthrifty. The most likely culprit is a scale insect found in China, Japan, and Korea. 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. They feed on the plant tissue by sucking the sap from leaves, stalks and stems, which can result in stunted plant growth, defoliation, and even death of the plant. Azalea bark scale (Acanthococcus azaleae) infestations can be severe. Many of these insects also cause damage to azalea and mountain laurel. The rhododendron is a commonly used landscape plant that has a specific complex of pests. Mature Lecanium scales appear as tortoise-like bumps (soft) on the bark. Hosts include andromeda, azalea, rhododendron, hawthorn, poplar, willow, and most recently blueberries. Azalea bark scale is a third insect pest of azalea. 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. Azalea bark scale shown on an azalea also may be found on rhododendrons. The scale excretes honeydew that coats leaves and limbs, resulting in a sticky coating from the excess sugars excreted from the insects’ feeding. Examples include brown soft scale, lecanium scale, azalea bark scale, magnolia scale and tuliptree scale. Infested azaleas usually appear chlorotic, and severe infestation of azalea bark scale can weaken or kill your azaleas. Video shows close ups of Azalea Bark scale and provides some plant inspection tips. 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. These are often found on branches or trunks. Lecanium scale found on woody plants such as azaleas and rhododendrons. They can appear in various colors and shapes. This insect can be mistaken for azalea bark scale that also can be found on the above mentioned plants. All types of fruit and ornamental trees, shrubs. If you have “sap” dripping from your tree it is honeydew and is a telltale sign of an insect infestation. Scale insects feed on bark or leaves, producing red or yellow spotting on the leaf or bark of twigs. Many of them are agricultural pests, while others prey on trees or other plant life. They can be cottony, smooth or waxy – but they do not produce a thick protective waxy covering separate from the body. Recognition and Life Cycle. Brown scale and azalea bark scale, Neolecanium cornuparvum ( Thro. weaken or your! Insects show up in azalea bark scale insects and twig crotches 6-12 mm in diameter she a. 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