On new growth and in heavy infestations, the scales may be distributed more uniformly on the branch (Figs. 18b. Note diffuse blotches on leaves. Leaves on affected branches wilt as affected branches die. Bark scale originates from China and was brought to the U.S. in 2010. A&M has identified this pest as Eriococcus lagerstroemiae, and suspects that it was brought into the U.S. on a crape myrtle plant. For example, note such things as exposure to sun, soil mois-ture over long periods, pesticide usage, fertilizers applied, or any other environmental condition you mayobserve. Brown and black tar spots are present on the underside of the leaf. Affected shrubs may be covered with sooty mold or appear as white, cottony masses within the forks of branches. pink 100 92 Jock pink 90 89 Sapphire blue 88 83 Rose Elf white, flushed violet-pink 81 81 Cilpinense white 80 80 Lucky Strike deep salmon-pink 80 80 Exbury Naomi lilac tinged yellow 79 79 Virginia Richards Chinese yellow with crimson blotch 76 76 Cowslip cream, pink 76 76 Pride of Leonards lee (Luscombei) rose-pink 76 76 Vanessa soft pink 73 72 Oceanlake deep violet-blue 72 71 Dora Amateis white, lightly spotted green 71 71 Crest yellow 70 Rainbow carmine-pink Point Defiance pink Naomi pink Pilgrim rich pink Letty Edwards yellow Odee Wright yellow Moonstone yellow Lady Clementine Mitford pink Candi bright rose Graf Zeppelin bright pink Snow Lady pure white Loderi Pink Diamond delicate pink Faggetter’s Favourite cream with pink *The higher the number, the less feeding is expected. 435 pp.Van Veen, Ted. Excessive amounts of some herbicides may cause similar symptoms (see EB1048, Leaf Scorch of Rho- dodendron).8, Fig. Then lookat the pictures and detailed descriptions until you identify the causes. The scale is a bark or felt scale belonging in the genus Eriococcus. Symptoms of their sucking include honeydew, sooty mold, and considerable leaf yellowing and die back. Azalea bark scale. ally the immature stage) feeds between theChlorosis—yellow coloration usually resulting epidermal (surface) tissue of leaves or just underfrom reduced development or loss of chloro- the bark.phyll. To treat, eliminate the insects and prune any dead or dying parts of the plant. Red females cover themselves and their eggs with a white, waxy protective coating. Figure 28. Lack of sufficient iron or manganese in the soil (uncommon).3. 29. The legless, cream colored, C-shaped larvae live in the soil and feed on the small roots through the winter. I have been scraping off the scale as I see it and have also begun treatment with your website’s advice. For specific solutions to correct maladies, refer to other publications or confer with a qualifiedplant diagnostician or individual who is knowledgeable about this plant group. greatly reduces the scale population. Cause: The fungus Briosia azaleae causes bud blight (Fig. Early symptoms include yellow- ing and wilting of new growth and irregular yel- lowing along margins of older leaves. Causes: 1. You may also see cottony masses in the forks of the branches of your azalea. Of the azalea bark scale the authors stated, "The azalea bark scale is closely related to, and in some ways resembles, mealybugs. May indicate treatment occurred and marginal yellowing. Cause: Actual causes are not known. Felt scales, also called bark scales, are not considered either armored scales or soft scales. Antonelli, Extension Entomologist; R.S. The fungus Phy- newer leaves are bigger than in past years, whichtophthora cinnamomi is a common cause of root indicates there has been a past problem and therot, but other species of Phytophthora and other plant is recovering.fungi can also be responsible. The woolly hairs arenormal (and often the prized feature) of some speciesand varieties of rhododendrons. If the pH of the soil is much above or below these fig-Both azaleas and rhododendrons belong to the ures, it should be adjusted. These greencaterpillar-like larvae blendwith the leaves (Fig. Lichens. Note the fecal drops or “tar” spots on leaf. (Last Updated On: August 28, 2018)A relatively new insect pest is troubling crape myrtle in north Texas cities and backyards. Poorly drained soil Planted too deep: If rhododendrons are plantedcan also be responsible as roots suffocate in water too deep, the symptoms on the plant will be simi-and are then invaded by rot organisms. The crapemyrtle bark scale, Acanthococcus (=Eriococcus)lagerstroemiae (Kuwana), is an invasive felt scale in the family Eriococcidae (or Acanthococcidae, as the taxonomy of this family is still being debated). Tortoise-likebumps (soft) are present onthe bark. In this case, pentachlorophenol Fig. Our up-to-date certified arborists will Marginal leaf necrosis. 7. If infestationis severe or plant is showingsigns of stress, chemical controlwill be necessary (see EB0746).Note: Oystershell andpossibly other scales mayalso attack this plant group.20, IndumentumSymptoms: A matted wooliness is present on the sur-face of the leaves (often the underside) or the twigs.The hairs range in color from white to a very brighttan-brown or rusty brown.Cause: Indumentum (Fig. Remove and destroy affected leaves. They can alsobe picked off and destroyedwithout using chemicals ifonly a few plants areinvolved.4, SPOTTING, DISCOLORATION, OR DEAD AREAS ON PLANT PARTS Physiological Leaf Spot Symptoms: Variously colored (generally dark purple), discrete or diffuse spots, discoloration and blotches occur on leaves as a result of environmental and cultural stress (Fig. Blackened branches made so by honeydew and mold, eventually sicken and die, as does the female when her egg sac is full. Heavy infestations may cause leaf yellowing, honeydew, stunting and die back. You can publish your book online for free in a few minutes! When crushed, these scales exude pink “blood”-like liquid. 19).Cause: Late spring frost. A: That crusty growth might look like a fungus or mold, but it’s actually a bug called azalea bark scale. Azalea bark scale (Acanthococcus azaleae) infestations can be severe. Frost damage to newly emerged shoots. 2. 11, 12). Dead ronmental stress. The azalea bark scale, Eriococcus azaleas, is a prominent pest of rhododendron, azalea, and huckleberry (Vaccinium spp.). Although leaves may look fairlyleaves remain attached to the plant. Sweeny, Krist, and Dimm. Varietieswhich start to grow early (such as Christmas Cheer) are sus-ceptible to late frost damage. Twisted, puckered new growth on rhododendron caused by aphid feeding. Physiological leaf spot. Azalea bark scale insects (Eriococcus azaleae Comstock), discovered in the United States in 1881, have earned a reputation as significant azalea pests. Iron chlorosis at left, leaves on the right show probableSymptoms: Marked yellowing (chlorosis) of leaf parts, manganese deficiency.primarily between veins of new leaves. Some chemicals areeffective in controlling adult wee-vils on the plants (see EB0970), butchemical applications only preventfuture notching. Remove and destroy (do not compost) affected buds. azalea bark scale on 'Nannie Angell' Casio QV-2900UX,scale 0205090004.s.JPG 1/1493s f/3.2 at 7.0mm full exif other sizes: small medium original auto Azalea Bark Scale-this appears as a white, waxy coating that the red females use to cover themselves as well as their eggs. Cause: The fungi Phyllosticta, Septoria, Pestalotia are com- monly the causal agents of this malady. Although an official name has yet to be given, this insect is thought to be an exotic pest that has somehow found its way to north Texas. Marginal leaf necrosis. Bark scales. Whitefly on azalea. A 100 rating indicates complete resistance.28, WSU Extension bulletins contain material written and produced for public distribution. If damage is significant, then a registered pes- ticide may be applied. A more complete list of azalea problems is at azalea diagnosis. Certain in- young crawlers are present in the scale that has been broken open.secticides will control this pestif applied when crawlers (newlyhatched nymphs) are present.Lecanium Scale Fig. EB0970. EB1051. Azalea bark scale. Symptoms of Cottony Maple scale can Bud blight. the bark of other shrubs and trees. Are these indoor or outdoor azaleas? Most materials registered for root weevils also control lacebugs. Maleike, Extension Horticulturist, WSU Western Washington Research and Extension Cen-ter, Puyallup; S.J. This sap-sucking scale can cause serious harm to your favorite Azalea or Rhododendron. Of soluble fertiliz- ers, cocoons, eggmasses, or sites listed on the leaf veins determine which the. Or rhododendron sometimesleads people to think a disease is involved honeydew, sooty isoften! Wilting of newly emerging growth and the pruning shears disinfected ) of a medium such asFungicides—chemicals that prevent or soil. 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