This application will smother the scale before the insects have a chance to form their protective coating. This scale lives and thrives on crape myrtle, suggesting a different identity for it. Azalea bark scale is most easily recognized by the white cottony sacs (Figure 4) that protect the developing pink eggs underneath (Figure 5). Oystershell scale Lepidosaphes ulmi (L.) Magnolia scale, Neolecanium cornuparvum (Thro. ) Lecanium scale found on woody plants such as azaleas and rhododendrons. See "Scale insect" in: Common Landscape Pests Azalea bark scale is a third insect pest of azalea. Figure 22. Ew, scale insects! Examples include brown soft scale, lecanium scale, azalea bark scale, magnolia scale and tuliptree scale. Damage Symptoms: Azalea bark scale has become recognized as a prominent pest of azaleas. Bark scales. Scales are so unusual looking that most people don’t recognize them as insects. Rhododendron Borers and Rhododendron Stem Borers Scale insects can overwinter as nymphs or eggs tucked away in tree bark. Symptoms/Damage. Leaves and limbs may feel sticky. Scale Download a PDF of this article Plants Affected. The new scale insect may be Eriococcus lagerostroemia, which feeds on Lagerostroemia indica in Japan and China. Scale insects are major pests on ornamental trees, orchards, indoor plants and even ferns. The discussion of the following insects will focus on recognition and life cycles, damage, monitoring and control options: Azalea Bark Scale, Erlococcus azalene. The most likely culprit is a scale insect found in China, Japan, and Korea. The "bumps" may be brown or marbled brown and white. When numbers are high, they appear crust-like. The azalea lacebug, Stepha- nitis pyrioides Scott, (Fig. Many of these insects also cause damage to azalea and mountain laurel. … Lace bugs/Spider mites. Common Insect Pests of Rhododendron. This scale has been reported on hawthorn, Andromeda, poplar, willow and ornamental cherry trees. )f azaleas. These are often found on branches or trunks. The rhododendron is a commonly used landscape plant that has a specific complex of pests. 1) is a major pst ! All types of fruit and ornamental trees, shrubs. Rhododendron scale disease is actually caused by an insect, Eriococcus azaleae, commonly called azalea bark scale. 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 (Acanthococcus azaleae) infestations can be severe. Crapemyrtle bark scale and azalea bark scale are felt scales. Azalea bark scale ( Eriococcus azaleae) Comst. For biology, life history, monitoring and management. Some common species of scale insects in Australia are pink wax scale, black scale, soft brown scale and citrus red scale. Like soft scales, these secrete honeydew, so sooty mold is often seen when felt scales infest a plant. It is by United States National Collection of Scale Insects Photographs at USDA Agricultural Research Service. Oyster-shell scales appear, as the name depicts, as small, hard oystershells on the bark. A more complete list of azalea problems is at azalea diagnosis. 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. Peony Scale Azalea Whitefly Azalea Leaf Miner Red Mite (Spider) Yellow Mite----- Leaf ... AZALEA INSECTS Azalea Lacebug Importance and Type of Injury. Both adults and nymphs cause damage by sucking juices from the under-side of the leaves. 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. Dimethoate (Cygon) can be used. Some look like bits of white cotton; others are brownish. See: Azalea (Rhododendron)-Azalea bark scale. Trees do not drip sap. Azalea bark scale insects produce a white, felted covering for their eggs. Leaves and limbs may feel sticky from byproducts of the insect’s feeding. Recognition and Life Cycle. Azalea bark scale is a species very similar in appearance to crapemyrtle bark scale. Categories. Azalea Bark Scale. 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). 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. Treating Azalea Bark Scale. Its common name comes from the raised network of veins on its clear, hardened forewings. Scale produces a waxy coating that makes them difficult to kill. Date of photograph or collection: 04/07/1980 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 Bark Scale (Acanthococcus azaleae) Family Erioccicdae Plants Damaged: This scale is a pest of azaleas and rhododendrons. Azalea Bark Scale. 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. Blackened branches made so by honeydew and mold, eventually sicken and die, as does the female when her egg sac is full. Members of the rhododendron family, azaleas are hardy flowering shrubs with large, colorful flowers. Malathion or acephate (Orthene) can be used as spray during crawler stage. Mature Lecanium scales appear as tortoise-like bumps (soft) on the bark. Unhealthy and weak plants sustain more injury from scale insects than strong plants. Small infestations may be scraped off and discarded. Symptoms of their sucking include honeydew, sooty mold, and considerable leaf yellowing and die back. Adults are 4–6mm long, and mottled black and tan. 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. The adult females (1/8 inch) with their white egg sacs are most noticeable in May and June. The azalea bark scale is a closely related species, but it has not been observed infesting crape myrtles. Rhododendron scales feed on the sap of the plant. Many of these insects also cause damage to azalea and mountain laurel. Nymphs (juveniles) are similarly coloured, but smaller and spiny in appearance, and they undergo a number of moults before they reach maturity. Scales: Several species of scale insects feed upon the rhododendron complex. The scale excretes honeydew that coats leaves and limbs, resulting in a sticky coating from the excess sugars excreted from the insects’ feeding. Print Image. Collector: R.J. Gill et al. Fiorinia hemlock scale, Fiorinia externa Ferris Scurfy scale, Chionaspis furfura ( Fitch) Oleander scale, … The azalea bark scale is tiny, but her effect, as seen on your azaleas turning black, is terrible. Infested plants usually appear chlorotic and unthrifty. This sap-sucking scale can cause serious harm to your favorite Azalea or Rhododendron. Many of them are agricultural pests, while others prey on trees or other plant life. Hosts: azalea, rhododendron, Andromeda, hawthorn, poplar, and willow Starting the last week of June to early July Table 1. Scale insects extract nutrients from plant tissue. 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 shown on an azalea also may be found on rhododendrons. The discussion of the following insects will focus on recognition and life cycles, damage, monitoring and control options. Hosts include andromeda, azalea, rhododendron, hawthorn, poplar, willow, and most recently blueberries. If large numbers are present, they may stunt or cause dieback on plants. The oil coats the scale insects and clogs their breathing pores, suffocating them. Azalea lace bugs feed on leaves, creating speckled areas on the leaf surface. Scale. “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. Scale insects feed on bark or leaves, producing red or yellow spotting on the leaf or bark of twigs. 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! They can appear in various colors and shapes. Whether flat against leaves or fruit, or lumpy bumps on branches or stems, this widespread superfamily of insects is well over 8000 species strong. If you have “sap” dripping from your tree it is honeydew and is a telltale sign of an insect infestation. Loading... Autoplay When autoplay is enabled, a suggested video will automatically play next. The insects appear as white, waxy encrustations. Fletcher scale, Lecanium fletcheri Lecanium sp. Scale insects Usually found on twigs or branches. These include Lecanium scale, oystershell scale, azalea bark scale, and several unknown species. Pest Control for Azaleas. Many homeowners confuse honeydew with sap. It affects rhododendron family plants, including azaleas. 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). Females cover themselves with wax and eggs, crawlers and females beneath the wax are reddish. Insects | Tree Care | Aphids | Azalea Bark Scale | Black Sooty Mold | Honeydew | Crepe Myrtles. Posted by Mr. Chris Brewer. Video shows close ups of Azalea Bark scale and provides some plant inspection tips. 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. Azalea lace bug (Stephanitis pyrioides) is an introduced insect. Cottony azalea scale is another soft scale insect that is most commonly found here in the Northeast on rhododendrons, azaleas and Pieris species. The white cotton-looking insects show up in limb and twig crotches. Why Are My Crepe Myrtle Stems and Leaves Turning Black? Up close, the azalea bark scale-insect is white to gray in color. To treat, eliminate the insects and prune any dead or dying parts of the plant. 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