Mature scales are about 1/8-inch long, brown or gray, and the general shape of an oyster’s shell. Males and females are about 1/10" inch long and resemble oyster shells. Indeed, oystershell scale has a worldwide distribution, it has a wide host range (over 150 plant species) and shares many tree and shrub hosts with JMS. For cottony maple scale, apply the insecticide in late June or early July; apply the insecticide in June for scurfy scales; in late May or early June for oystershell scales; or in June and July for lecanium scales. Oystershell scale may be killing tree and shrub branches in urban tree plantings By: Cliff Sadof, csadof@purdue.edu Trees and shrubs can lose their leaves for many reasons. It has the appearance of small clusters of oyster-shaped “shells” that cover bark on shrubs and trees. They feed on a wide variety of plants and shrubs, including maple, ash, dogwood, elms, and lilac. Carefully lifting them and taking a look under high magnification will reveal the pearly white eggs. Oystershell adults excrete a waxy cover that gives it is oyster-like appearance. This cover protects the insect’s eggs throughout the winter. The most common scale insects that infest maple trees are the armored varieties oystershell scale and scurfy scale, as well as the soft varieties cottony maple scale and lecanium scale. /Contents 4 0 R>> Diseased trees and shrubs must be bagged and tied closed to prevent the pests from spreading. Managing Oyster Shell Scale Insects. Oystershell scale affects 120 species, many of which grown in Calgary — such as lilacs, hawethorn, green ash and crabapple trees. Oystershell scale males and females are oyster-shaped, gray, 1/8" long, and with the exuviae accumulated at the narrow end. Long mouthparts are inserted into plant tissue where they feed on individual cells. The maple tree in the cover photo is planted in a parking lot, and mulched incorrectly. Many types of scale insects exist, grouped into two main categories: armored scales and soft scales. When honeydew falls from a tree, leaves shouldbe inspected for live soft scales or mealybugs. Identify lecanium scale (Parthenolecanium spp.) %���� Coat the foliage with the insecticidal soap after the scale crawlers have hatched, and then apply the insecticidal soap again about 10 days later. Mature scales are gray or brown, range from 1/16-1/8 inch (1.5-3 mm) long, and have parallel, arcing ridges. A heavy infestation will weaken the plant and heavily infested plants may drop leaves. July 30, 2015 Lapidosaphes ulmi. Oystershell scale. Some types of soft scales include lec… Heavy infestations can impart a gray, mottled look to the bark (fig. The oystershell scale is one of the most common armored scale insects that cause injury to shade trees and shrubs. If practical, improve plant sites to reduce stress and promote growth. Life cycle of oystershell scale. These insects attach their shell-like bodies to the bark and subsist by sucking the sap of the shrub, eventually killing the branch or entire plant. Not a cure all but would bring them under some control. Depending on how many trees you need to treat you should be able to find an economically sized product. Lepidosaphes ulmi (Linnaeus) Introduction. Ensure that the insecticide is labeled for red maple trees and the specific type of scale insect that’s infesting your trees. ���..q�������� ��������GG�̠�'#Qf�r�O�{S\. It infests trees of all sizes and ages and can kill young trees. 3 0 obj Tree Fruit. Oystershell Scale. Oystershell scales spend the winter as eggs under the tests of the females. No honeydew is produced. The oystershell scale is a small (1/20 to 1/8 inch long), elongated, oyster-shaped insect. resembles an oyster’s shell. The scale is often "discovered' because branches are dying back from the feeding injury. That is the period of their development when they are the most vulnerable to treatments that can reduce their population and overall impacts. Pest description and damage The mature scale is approximately 0.125 inch long, hard-shelled, brownish or gray in color, and usually elongated and slightly curved like an oyster or mussel shell. The females die after this stage, but their bodies remain on the branch (eek). The Signs and Symptoms of Magnolia Tree Scale. Depending on how old they are, their color can vary from brown to white. Pine needle scales appear as oyster shell-shaped white blisters on the needles of conifers, often so numerous they envelop the entire needle. Tree scale not only robs a tree of its beauty, it also destroys its health due to scale insects feeding on tree sap – the very life of a tree. Submitted by Marie Semenick-Evans I discovered oystershell scale about 4 years ago. 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