Twice-stabbed lady beetles and certain wasps and flies are among the natural enemies that help to control cottony maple scale. COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. Male scales are tiny, winged insects. The female will deposit 1,500 to 3,000 eggs before she dies. Cottony maple scale is most recognizable when the female produces an egg sac made of strands of wax that resembles cotton in color and texture. During the summer the female produces her eggs within a large, bright white cottony mass that resembles pieces of popcorn on the stems of plants. The information contained herein can be changed without notice and you should contact the manufacturer to confirm. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. Cottony maple scale, overwintering stage on twigs. All Rights Reserved. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. Cottony maple scale, oyster shell scale, European elm scale, lecanium scale, and pine needle scale are common pests. The insect spends winter in an immature stage on twigs and branches, maturing in late May or early June. A systemic applied to the soil can also provide effectiveness in killing the feeding scales. Cottony maple scale is always present in Iowa but in most years is too low in abundance to attract attention. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… Their eggs are white to pale yellow and are meshed in a white, cottony … The tree may become weak if the infestation is severe and repeats for several years. Immatures overwinter on twigs. Copious amounts of honeydew may be produced. They are black, flat, and oval. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Cottony Maple Scale. Each mass usually contains 1,000-1,500 eggs. Cottony Maple Scale Characteristics. Crawlers appear in June and immatures in summer on the underside of leaves. The oval-shaped dark brown females remained highly visible with their ovisacs peeking out from beneath their bodies. (76) Photo: Whitney Cranshaw Cottony maple scale crawlers along leaf veins in the summer. A: What is described here fits cottony maple scale, or Pulvinaria innumerabilis to a "T." The white bumps that line branches (often in great numbers) … It has been reported on over a dozen species of trees, but is most common on silver and red maple. They are slightly convex and are brown with a yellow-brown ridge down the back . Cottony maple scale, Pulvinaria innumerabilis, is very common this year in northeastern Illinois.This insect occurs in the northern half of Illinois, as far south as Danville and Lincoln. the cottony maple scale by s. a. johnson published by the experiment station fort collins. Print a PDF of this page: Cottony maple scale. This information is for educational purposes only. Cottony maple scale is found primarily on silver maple and honeylocust; rarely on alder, box-elder, catalpa, elm, dogwood, hackberry, hawthorn, crabapple, oak, plum, pear, cherry, linden, lilac, willow, beech, poplar, and sycamore. In general, adult scales are hemispherical, with either a glistening-smooth, waxy body, or white cottony surface. Date Issued 1906. Cottony camellia scale and cottony maple scale are other similar species. Immature females are flat and inconspicuous. Read and follow the Product Label and Safety Data Sheet ("SDS") for your health. As this egg mass develops the top of the wax shell may bend backward, giving it a wrinkled appearance. © 2020 ES OpCo USA LLC. It is also known to be able to survive on other deciduous trees and shrubs including honey and black locust, white ash, euonymus, oak, boxelder, dogwood, hackberry, sycamore, linden, beech, elm, willow, basswood, poplar, rose and sumac. Early instars overwinter, developing to the adult female in late spring. Native to eastern North America, but now found throughout the U.S. There is one generation a year. An IGR applied when crawlers are present also may be effective. Cottony Maple Scale. Cottony Maple Scale in Northwest Ohio Earlier this week, Eric Richer (OSU Extension, Fulton County) sent me an image of a maple with almost all of the branches covered with Cottony Maple Scale females that were extruding their elongated, white, cottony ovisacs. Consequently, they may not be effective where several … Eggs masses are conspicuously white and cottony in appearance. Look for crawlers as littleleaf linden begins bloom, or Hydrangea arborescens ‘Grandiflora’ or ‘Annebelle’ are in full bloom. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. Following a recommended fertility program and watering regime will promote plant health. Did you know these are actually an insect? They are primarily a problem in beech, elm, linden, maple, conifers, oak, and pine but they can also affect other tree species. Bowhall Red Maple / Family AceraceaeBowhall red maple is a spectacular street or specimen tree. Cottony maple scale occurs most commonly on silver maple, but is also common on other maples including box elder. Eggs are produced and hatch in early summer, with the mobile crawler stage moving to leaves to feed on the lower surfaces for the rest of the growing season. Adult females are about 3/16 inch long. During the winter the cottony maple scale is in the immature stage and is small, oval and flattened in shape, and pale green in color. Issue 8, June 11, 2010. Pulvinaria innumerabilis. ES OpCo USA LLC is not liable for any damages resulting from the use or non-use of the information and each ES OpCo USA LLC affiliate is responsible for its own actions. The Veseris mark, logo, and other identified trademarks are the property of ES OpCo USA LLC or its affiliates. Female cottony maple leaf scales with ovisacs on a maple leaf damaged by cankerworms. These scales also produce large amounts of liquid waste Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. The adult female is about 1/8 inch long, with a flattened brownish wax shell. The "cotton" is actually waxy threads covering as many as 1,500 eggs. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Female scales produce cottony white ovisacs in spring then die. 9). For ornamentals dormant or summer oils may be effective in killing the scales, as well as contact insecticides applied when the first instar crawlers are present. The body is covered with flakes of clear wax. These insects overwinter as immature females on twigs. Large outbreaks are generally only seen on stressed or weakened trees. Cottony maple scale is a food source for many predaceous insects and parasites. In western states it is a minor pest of vineyards, with most of the damage due to the honeydew and resulting sooty mold that may damage fruit. Cottony maple scale, Pulvinaria innumerabilis Hosts: linden, maple, basswood, ash, elm, hawthorn, locust, fruit trees, and others. I was wondering what you can tell me about cottony maple scale. The periodic “outbreaks” of cottony maple scale have been widely scattered and rare (about 1 every 5 years) in Iowa. An outbreak of cottony maple scale,Pulvinaria innumerabilis (Rathvon) was not controlled by chemical treatments, but large numbers of the coccinellid,Hyperaspis signata (Say), almost eliminated the scale in the succeding year. Mature females are easily recognizable by the distinctive cottony white sac that… (76) Photo: John Davidson be controlled as crawlers and immatures. Back to IPM scouting in woody landscape plants. The eggs hatch in June and July. They then move back to small twigs prior to leaf-drop and settle in there to spend the winter in the next instar stages. Peak crawler activity to begin June 27 – 30. Scales tend to thrive on stressed plants. For questions about accessibility and/or if you need additional accommodations for a specific document, please send an email to ANR Communications & Marketing at anrcommunications@anr.msu.edu. The developing females and nymphs produce copious amounts of honeydew which can collect on foliage and branches and cause growth of sooty mold. However, over-fertilization favors scale buildup. Squirrels loves them some seeds. The crawler stage occurs from Scale- there are a number of common scales that impact trees along the Wasatch Front. Cottony camellia scale and cottony maple scale are the other common species. The insect spends the winter in an immature stage on twigs and branches, maturing in late May or early June. Cottony maple scale is found primarily on silver maple and honeylocust; rarely on alder, box-elder, catalpa, elm, dogwood, hackberry, hawthorn, crabapple, oak, plum, pear, cherry, linden, lilac, willow, beech, poplar, and sycamore. (on oak, hickory, ash, birch, beech, honeylocust, yews, arborvitae, Prunus spp. Origin: Native to eastern North America, but now found throughout the U.S. Arborist Dave Leonard recently brought samples to the on black gum. Cottony maple scale (on silver maples and honeylocust) and severval Lecanium scale spp. Cottony maple scale is most common on silver maples, but it can feed on other maple species, boxelder, basswood, birch, elm, and linden. and many others) have a similar life cycle to the calico scale. ES OpCo USA LLC. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. provides this information "as is" and makes no representation or warranty, express, or implied, concerning the accuracy or sufficiency of the information and disclaims all implied warranties. All other trademarks not owned by ES OpCo USA LLC or its affiliates that appear in this communication are the property of their respective owners. Read about the Pesticide Safety & Education Program. Crawlers live on the leaves near veins during summer and migrate back to twigs in fall before the leaves drop. You can find these now on their most common hosts: maple and dogwood. Custom Search Acer rubrum 'Bowhall' Red maple seeds are popular with squirrels and birds. All information is based on data obtained from the manufacturer or other recognized technical sources. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. However, in some years, the scale population increases above “normal” and becomes large enough to get noticed. During the warm temperatures of spring, the scale reaches maturity and, by late spring, the brown, elongate scale has a characteristic white, cottony egg mass attached to it. The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. Cottony Maple Scale. (77) Photo: Whitney Cranshaw Cottony maple scale, adult females with egg sacs on twigs. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Sep 20, 2017 - In midsummer white cottony blobs resembling popped popcorn kernels sometimes appear on the undersides of twigs and branches of maple, boxelder and other trees. The 1/4-inch white cottony ovisac, or egg sac, is deposited on bark. The scales feed on many kinds of maples and boxelder, as well as elms, birch, poplar, willow, and other trees. Insecticides are rarely needed in the landscape due to natural enemies and tolerance of trees. These scales become most visible when they produce their cottony white egg sac in early summer (Fig. Cottony maple scale is a soft scale insect that attacks many common ornamental nursery crops. All transactions involving this Product(s) are subject to ES OpCo USA LLC Standard Terms and Conditions, available at https://www.veseris.com/sales-terms or upon request. Severely prune back heavily infested branches and protect new growth with insecticide applications. Cottony Maple Scale. MSU is an affirmative-action, equal-opportunity employer. The egg … Cottony Maple Scale. The European fruit lecanium scale is the most common soft scale in Utah. Description The overwintering form of the cottony maple scale is a small, brown, flattened 1/8 inch long scale attached to the bark of twigs and small branches. Cottony maple scale occurs most commonly on silver maple, but it can also feed on other maple species, boxelder, basswood, birch, elm, and linden. Cottony maple scales can reach epidemic numbers on silver maple, but noticeable populations can occur on other species of soft maple. The cottony mass resembles popcorn and, if the population is high, the ‘kernels’ will line up along the branches and twigs. If practical, improve plant sites to reduce stress and promote growth. Females mature and white egg sacs develop in June, when ‘Snowmound’ spirea or mock-orange are in full bloom. Second, the scale is obvious and distinctive (a rare combination when talking about insect pests). Height: to 50', Hardy north of zone 9. Mature… Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. I have it on my silver maple tree. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Cottony Maple Scale This tree is often confused with red-leaved cultivars of Norway Maple. The cottony maple scale, Pulvinaria innumerabilis, is a common insect pest in midMichigan. Author(s) Johnson, S. Arthur (Samuel Arthur), 1866-1943. 1). Cottony maple scale outbreaks often subside in … Honeydew is produced in abundance in May and June and crawlers emerge in June and early July. The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. cq~qradq . Fall color […] First, the cottony maple scale prefers maples, particularly silver maple, but may occur on almost any hardwood tree or shrub. Cottony scale Scale insects that feed on deciduous trees: Soft Scales Cottony maple scale on our Acer Palmatum providing data security using image steganography java FL Tree Shrub Systemic Insect Drench Gal (480x600) Insects, like other animals, need large amounts of nitrogen, but plant sap contains very little nitrogen. ... Cottony maple scale is easily recognized by the female’s large white egg sac. Newly hatched scales are called crawlers. London planetrees in Utah were hit hard with anthracnose this spring, and unfortunately, some trees are experiencing a triple whammy of anthracnose, plant bugs, and sycamore scale (a pest of newer concern). Biology: The scales feed on many kinds of maples and boxelder, as well as elms, birch, poplar, willow, and other trees. Pulvinaria innumerabilis . Format bulletins These insects overwinter as immature females on twigs. 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. I am finding out that there is a large outbreak in northern Illinois this year. Pest description and damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. Earlier this week, Eric Richer (OSU Extension, Fulton County) sent me an image of a maple with almost all of the branches covered with Cottony Maple Scale females that were extruding their elongated, white, cottony ovisacs. Cottony maple leaf scale, Pulvinaria acericola, is one of several ‘cottony’ scales in the genus Pulvinaria. Mature females are easily recognizable by the female’s large white egg sacs on and! Of sooty mold and birds it a wrinkled appearance overwinter, developing the... 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A twigs crawler stage occurs from Scale- there are a number of common scales that impact trees along Wasatch! Mm long ( Fig over a dozen species of soft maple bowhall red maple Family... Number of common scales that impact trees along the branches and cause growth of mold! Twice-Stabbed lady beetles and certain wasps and flies are among the natural enemies tolerance... Suffocation or after penetrating over-wintering stages of the wax shell May bend backward, giving it wrinkled! Ovisacs peeking out from beneath their bodies and migrate back to twigs fall!
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