The adult female azalea bark scale can be described as dark red with short legs and antennae and long, sucking mouthparts. Adult females are felt-like white or gray encrustations that stick to crape myrtle parts ranging from small twigs to large trunks. Azalea bark scales. Notify me of follow-up comments by email. The scale insects have long, needle-like mouthparts they insert into the plant for sucking plant juices. So in Michigan, when we grow azaleas we are usually focused on finding protected sites and providing winter protection by covering the ground over the roots with mulch and draping protective burlap over the entire plant. An alternative treatment for azalea bark scale is a basal soil drench with imidacloprid. Hosts include andromeda, azalea, rhododendron, hawthorn, poplar, willow, and most recently, blueberry in the Pacific Northwest. Female insects are approximately 0.125 inches long. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Heavy infestations can be sprayed again two weeks later. Many people who call us describe their trees as covered in white dots, or white cotton like bumps. Azalea bark scale, Eriococcus azaleas Comstock, Eriococcidae, HEMIPTERA. It has been reported in the Eastern US, as well as Belgium and Russia. Eggs are deposited into the white waxy egg sac in late April, Crawlers prefer branch crotches and twigs where they insert their mouthparts, There is one generation per year. pyriproxyfen (Esteem) at 0.1 lb ai/a. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). Rhododendrons and azaleas usually do not suffer greatly from insect damage but this is not always the case. To treat, eliminate the insects and prune any dead or dying parts of the plant. This is a pest that generally does not kill hosts, rather it causes aesthetic damage. Beneficial predators and parasites will usually provide adequate control of light bark scale infestations. When crushed, these scales exude pink “blood”-like liquid. 4 through 6). The insect is hidden from view by the egg sac (ovisac), a covering of felted/matted waxy threads (Fig. For more information, visit https://extension.msu.edu. Honeydew can be an inconvenience as well. Neem oil products work by suffocating the insect. A late-winter or early-spring soil drench of imidacloprid systemic insecticide around your azaleas can control azalea bark scales for an entire growing season. Branch dieback. Spray the adult scales so Organocide 3-in-1 Garden Spray will slide under their bodies and block their spiracles (breathing holes) causing them to suffocate. Azalea Bark Scale Diagnostic Guide; Azalea Lace Bug Diagnostic Guide; Azalea Whitefly Diagnostic Guide; Bagworms Diagnostic Guide; ... Each one contains signs and symptoms, treatment strategies, and treatment expectations designed to help you properly diagnose diseases and provide effective solutions. Scale sounds and looks a lot like a plant disease, but the term actually refers to infestation by any one of more than 7,000 species of tiny sap-sucking insects.Scale insects typically adhere to the stems, branches, and sometimes the leaves of plants to feed on sap, and they have a shell-like bump appearance, which sometimes causes them to be mistaken for a fungal or bacterial disease. Warning : Horticultural chemicals tend to work because they are harmful. Bark scales Azalea bark scales cause yellowing and a soot or mold appearance on stems. Post was not sent - check your email addresses! Scale insects appear as small raised bumps on the twig or leaf. Azalea Bark Scale – This azalea plant pest occurs most often in the eastern United States. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Mature female scale are about 0.13 inch long and appear like white cottony sacs, often located on twigs and stems of azalea, especially in branch axils. Good culture practices are a key element of keeping plants resistant to bugs and germs. June 2, 2015. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. The red eggs are laid within the egg sac, occupying the void left by Rhododendron Borer. Consider hand–removal by squishing the scales to prevent populations from increasing. This sap-sucking scale can cause serious harm to your favorite Azalea or Rhododendron. This will smother both adult and immature scales. 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