The oak lecanium scale, Parthenolecanium quercifex, is a common pest of ornamental trees and shrubs in the eastern US. Skin is covered with white waxy powder. However, these scales also cause significant lower branch dieback and can be seriously stressful to the tree. Eggs hatch in early summer and the immature insects seek feeding siteS on the underside of leaves. Oak lecanium. and birch (Betula spp). They are more or less hemispherical or turtle-shaped, brown, and range in size from 1/8" to 1/6". European fruit lecanium, Parthenolecanium corni (Bouche), and oak lecanium, Parthenolecanium quercifex (Fitch), are commonly found in mixed populations as pests of oak trees (Quercus spp.) are soft scales. Lecanium scales are common insect pests that infest a wide range of species. These scales feed directly on plant parts that transport fluid and nutrients. Lecanium Scale Diagnostic Guide; Lecanium Scale Diagnostic Guide. and Ehrhorn's oak scale (Mycetococcus ehrhorni). Oak lecanium scale and European fruit lecanium are nearly identical soft scales that infest oaks and many other tree species including redbud, dogwood, maple, fruit trees, and others. In spring adults swell to large (for scales) hemispherical egg cases with thousands of eggs. This soft scale insect (Hemiptera: Coccidae) is primarily a pest on oak but has also been recorded on other species including hickory (Carya spp.) Parthenolecanium pruinosum, sometimes called globose scale, is usually a pest only on walnut. I have a 5 year old Red Oak which has small reddish bulbous growths on the small limbs. The look-alike European fruit lecanium is generally not found on oak. Asked March 3, 2017, 7:12 PM EST. This is the stage you will see now on infested twigs. Oak lecanium feeds on oak; Fletcher scale feeds on arborvitae, juniper, and yew. Oak pit scale nymphs. Apparently there is a connection with mosquito spraying. Lecanium Scale Insect Notice and FAQ . Fletcher scale, One can find oak lecanium, P. quercifex, on our native white oaks but often held in check by parasitic wasps. Crawlers that hatch from these eggs move to leaves, settle, and feed on sap during the rest of the summer. White eggs are laid beneath the adult female’s scale cover in late spring and hatch into reddish crawlers. in the region. Lecanium scales are most prominent on twigs during the spring and early summer. Development resumes in the spring and mature females produce large numbers of eggs which are protected by their soft waxy covering. Many species of hardwoods are susceptible, but the most commonly infested tree types are oak, maple and honeylocust. The scale ranges from 2 to 6 mm in length, depending on its age, and it may have some amount of white wax over it. Common Name: Oak lecanium; Other Names: N/A Pest Details. This sugary sap is a nuisance to cars, decks, walkways, patios, stoops, and the understory plants beneath the oaks. They are round and reddish brown. Like the cottony maple scale and other soft scales, the lecanium scales excrete large amounts of honey-dew with its attendant nuisance factor. Military & senior discounts. Tree trimming, tree and stump removal, storm damage, pruning by certified arborists. Soft scales are some of the most prevalent and difficult to control arthropod pests in urban landscapes of the southern United States. Damage can be serious in oaks along the Central Coast as well as in the Central Valley. There is currently an outbreak of Lecanium scale insects in the Glenview area. LECANIUM SCALES on Red Oak. As females swell in the spring they produce considerable honeydew. The female lecanium scale are about 0.13 inch in diameter and vary from red to dark brown in color. Invariably, the scales are described as “lecanium scale”. Trees of poor vigor or with branch and crown dieback should be examined closely for scale insects. What is the best treatment? Asked March 21, 2014, 9:54 AM EDT. This soft scale insect (Hemiptera: Coccidae) is primarily a pest on oak but has also been recorded on other species including … Origin: Possibly a native insect in North America. Parthenolecanium spp. Lecanium scale. For this reason, they are commonly referred to as the Parthenolecanium corni complex. With many residents experiencing the symptoms of their spread, it is important to note that these insects are not harmful to humans. Typically, they appear as bumps or scales that can be seen along the twigs of affected trees. Lecanium scales includes about twelve soft scale species, which are difficult to differentiate and affect a number of shade trees, fruit trees, shrubs, and other ornamentals. The much rounder lecanium scale is also found in landscapes and nursery production. Males have wings and are brown. Lecanium scales spend the winter on twigs and branches in an immature or nymphal stage. Effective on. European fruit lecanium scale Parthenolecanium corni Fletcher scale Parthenolecanium fletcheri Magnolia scale Neolecanium cornuparvum Oak kermes scale Kermes pubescens Pine tortoise scale Toumeyella parvicornis Tuliptree scale Toumeyella liriodendri. Lecanium scale on Oak tree. There are approximately one dozen different species of these soft scales that are difficult to distinguish from one another visually. Oak lecanium scale (Parthenolecanium quercifex) is a common pest on oaks. What do you recommend? The European fruit lecanium scale is a slightly ovate, reddish brown scale about 1/8 inch in diameter as a mature female. The adult females are 1 / 16 to ¼ inch (2 to 6 mm) in diameter. Adult females typically have soft bodies and no limbs, and are concealed underneath domed scales, extruding quantities of wax for protection. Yew (Taxus) Mid-June to mid-July (immature) Magnolia Scale (Neolecanium cornuparvum) (soft scale): Large female up to 1/2 inch long. Kermes Oak Scale. has lecanium scale we've been told by a tree company. Lace Bug Lady Beetle, Asian Leaf Drop in Spring Leaf Scorch Leaves That Don't Drop in the Fall Lecanium Scales Lilac Borer Lilac, Powdery Mildew Lilac, Pseudomonas Blight Little Barley. Soft scales are slightly larger, about 1/4 inches long, and smooth, cottony or waxy. Kermes scales (Kermes spp.) There are many types of scale insects. Of dramatically variable appearance and extreme sexual dimorphism, they comprise the superfamily Coccoidea. Pit scales are about 1/4 to 1/2 inches in diameter and include the oak pit scale (Asterolecanium spp.) and lecanium scales (Eulecanium spp.) Scale insects are small insects of the order Hemiptera, suborder Sternorrhyncha. The female lays eggs in April and May. From your photo, I can see that your oak has lecanium scale, a kind of insect that infests a wide range of trees, including oaks, maples, lindens and birches. Biology. Return to Top. The armored scale's straw-like mouth moves like a plumber’s snake to burst plant cells and feed on their contents. They did not specify what the injections were but I can ask. Lecanium Scale: There have been numerous recent reports of scale insect infestations on many deciduous tree species in the Wichita vicinity. “Lecanium scale” is a commonly used name for over a dozen different commonly related scale species. 36 Oak lecanium scale (Parthenolecanium quercifex) 38 Obscure scale (Melanaspis obscura) 40 Pit scales: Oak pit scale (Asterolecanium minus, A. quercicola); Golden oak scale (A. variolosum) 42 Treehoppers (Platycotis vittata, P. vittata quadrivittata) Contents Contents. It is most common on coast live oak. Through internet searches, it appears that these are LECANIUM SCALES and would like to confirm this and get information on what needs to be done about them, if anything. LECANIUM SCALES Lee Townsend, Extension Entomologist Several species of soft scales, referred to as Lecanium scales feed on sap from shade trees and woody ornamentals. Lecanium spp. We see many ashes and sugar maples in Midland with severe lower branch dieback caused by this scale insect. One small tree was under the willow oak where I got the sample of Lecanium Scale and I was not surprised to find Lecanium scale starting to take hold of the smaller tree this season in 2015, All the above happened in 2013, This year 2015 two years later, there were crawlers on the small willow oak that we moved from the front yard to the back yard. The tree company has recommended soil injections done in March. In many parts of the state, we are seeing an outbreak of Lecanium scale on hardwood trees. Parthenolecanium quercifex occurs on oak and other Fagaceae (e.g., chinquapin, Chrysolepis). The scales can vary in length from 1/8-to-1/2-inch, depending on species. Juniper Scale (Carulaspic juniperi) Maple Bladdergall Mite and Maple Spindlegall Mite (Vasates quadripedes and V. aceriscrumana) Oak Lecanium (Parthenolecanium quercifex) Obscure Scale (Melanaspis obscura) Orangestriped Oakworm (Anisota senatoria) Red-headed Flea Beetle (Systena frontalis (F.)) Sawflies; Southern Red Mite (Oligonychus ilicis) Crawlers (immature scale insects) hatch from the eggs. Several Asterodiapsis species of pit scales (family Asterolecaniidae) attack many of the common deciduous and evergreen oaks that grow in California, with the valley oak, Quercus lobata, affected more frequently and severely than other species. DAMAGE. The crawlers settle down within a week or two. Free estimates & same-week service. Pest description and damage Lecanium scale are most noticed as they expand in spring. Return to Top. Frosted scale. Parthenolecanium spp. The oak lecanium scale, Parthenolecanium quercifex, is a common pest of ornamental trees and shrubs in the eastern US. 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