Cottony maple scales will produce white cottony egg sacs by mid-June. The female will deposit 1,500 to 3,000 eggs before she dies. It was described A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. And they will ruin your citrus, unless you get it under control. These cottony masses can contains hundreds of eggs each. Damage: COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. However, in some years, the scale population increases above “normal” and becomes large enough to get noticed. This is an armored scale and, unlike the cottony maple and calico scales, it does not produce honeydew. You can find these now on their most common hosts: maple and dogwood. Immature forms (crawlers) are flattened and brown to yellowish green in color; however, the conspicuous, cottony egg sac of the mature female is two to three times the length of the scale … Crawlers hatch through June and remain on the undersides of the leaves through winter. Their eggs are white to pale yellow and are meshed in a white, cottony ovisac which may be … Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Pest description and crop damage The cottony maple scale is one of the largest soft scales. Cottony Cushion Scale Insect A sample of Pittosporum was brought into the office to have an obvious issue identified. The cottony maple leaf scale is so named because the females exude their eggs in an elongated, white, cottony structure called an ovisac which are stuck onto the underside of leaves. Consequently, they may not be effective where several l… The crawler's waste is called honeydew. Cottony Cushion Scale Insect A sample of Pittosporum was brought into the office to have an obvious issue identified. Following a recommended fertility program and watering regime will promote plant health. Heavy infestations can cause leaves to turn yellow to light green and may cause stunted leaf growth. However, over-fertilization favors scale buildup. The cottony mass resembles popcorn and, if the population is high, the ‘kernels’ will line up along the branches and twigs. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. We embody the University's land-grant mission with a commitment to eliminate hunger, preserve our natural resources, improve quality of life, and empower the next generation through world-class education. They lay white cottony ovisacs (egg masses) on the. The "cotton" is actually a waxy secretion enveloping the ovisac, which may contain over 1,500 eggs. (76) Photo: John Davidson be controlled as crawlers and immatures. Nymphs are brown-translucent, 1/5 inch; females lay eggs in the white marshmallow egg-sac along the twigs and small branches; Young insects remove sap from leaves creating a speckled appearance and possibly yellowing leaves in mid to late summer Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. Cottony Maple Scale starts off as an unnoticeable, brown scale. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. The scales grow to adulthood on the leaves and mate in August or September before the females return to the twigs to spend the winter. Cottony Maple Scale (Pulvinaria innumerabilis) is a soft scale insect pest that commonly attacks maple trees, but can be found on a variety on hosts.Usually it is just a nuisance, but in very severe infestations, it can kill weakened trees or branches on otherwise healthy trees. Cottony Scales include Cottony Camellia Scale (Hollies and verious other plants), Cottony Taxus Scale (Yews), Cottony Maple Scales (Silver Maple, Dogwood and others) and Azalea Bark Scale (Azalea, Andromeda and Rhododendron). Severely infested trees look like they are covered with strings of popcorn. Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. Timing pesticide application to the crawler stage is very important. This insect occurs in the northern half of Illinois. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Damage to the host tree is caused when heavy populations of cottony maple scale withdraw sap from the plant, resulting in branch and twig dieback. Cottony maple scale on a silver maple. Severely infested trees look like they are covered with strings of popcorn. What was causing the problem may not have been so obvious. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. The scale is called maple cotton scale, Pulvinaria innumerabilis whereas cottony cushion scale is Icerya purchasi, which I am sure clears that up completely for you doesn’t it? Central Maryland Crawlers settle on… Although a heavy infestation may cause some thinning of the canopy, it rarely results in tree death. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. Cottony Scale insects produce cottony egg masses from which young crawlers emerge. Hosts: Maples (especially silver), honeylocust, linden and other hardwoods. While conspicuous, P. innumerabilis infestations usually have little impact on established trees. Cottony Maple Scale; May 18, 2005: We are receiving reports of silver maple trees dripping in the Kankakee County area and have seen some specimens of cottony maple scale from northern Illinois. Cottony camellia scale is a soft scale that feeds on camellia, holly, yew, euonymus, sweetbox, and maple. The biggest problem is the honeydew dripping down on decks, picnic tables, lawn chairs and parked cars. Mature females are easily recognizable by the distinctive cottony white sac that… The cottony maple scale is common on maple, boxelder, hackberry, dogwood, beech, apple, oak, linden, honeylocust, and elm. Although a heavy infestation may cause some thinning of the canopy, it rarely results in tree death. 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) are the egg sacs. Cottony maple scale occurs most commonly on silver maple, but is also common on other maples including box elder. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. Severely infested trees look like they are covered with strings of popcorn. What was causing the problem may not have been so obvious. Scales tend to thrive on stressed plants. 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. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. The cottony white egg sacs of this soft scale appear on undersides of leaves (Figure 1) in May and egg hatch (Figure 2) occurs during June. At maturity, the females produce the white, cottony egg masses, called ovisacs, over a period of several weeks. Egg sacs of cottony maple scale. One of the most effective is the use of horticultural oils to smother the insects. Cottony maple scale crawlers along leaf veins in the summer. Cottony Cushion Scale had taken over, right under my nose! .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. Cottony Scales include Cottony Camellia Scale (Hollies and verious other plants), Cottony Taxus Scale (Yews), Cottony Maple Scales (Silver Maple, Dogwood and others) and Azalea Bark Scale (Azalea, Andromeda and Rhododendron). The pest is very common in … The cottony maple scale (Pulvinaria innunerabilis Rathv.) The pest is very common in the tri-city area of Michigan at this time. ma-turity is the most conspicuous scale insect indigenous to the United States, and has received much attention from entomologists and hor-ticulturists on account of its occasional abundance. By late spring the insect has developed into a mature female and begins laying as many as 1,000 eggs. In the spring, a white egg sac is developed and holds many crawlers (insect). The scale overwinters as an immature female on the twigs of the host. Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. The eggs hatch in June and July. Each mass usually contains 1,000-1,500 eggs. 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. Pest description and crop damage The cottony maple scale is one of the largest soft scales. The most important part of scale insect control is timing. The insect spends winter in an immature stage on twigs and branches, maturing in late May or early June. Cottony maple scale is a lecanium-type scale, being very similar in appearance to European fruit lecanium for most of the year. Appearance: The most noticeable stage is the brown adult female with a large cottony mass (egg sack) protruding from the rear. Cottony taxus scale is most commonly found on yews and hollies in this area. Cottony cushion scale, Icerya purchasi, can infest a number of woody ornamentals and certain crops ().Common hosts in California are citrus, cocculus, nandina, and pittosporum. 1). It is also known as cottony taxus scale. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. It is also reported on beautyberry, jasmine, mulberry, and hydrangea. Leaves may turn yellow and drop prematurely. 4 Spray your Japanese maple with insecticidal oil or soap. Adult females are about 1/8 inch long, oval and yellowish tan with a brown margin. 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. The insect tends to populate the undersides of leaves/needles. Cottony maple scale is always present in Iowa but in most years is too low in abundance to attract attention. Cottony maple scales will produce white cottony egg sacs by mid-June. Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. Management . Cottony maple scale outbreaks often subside in … The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Eggs masses are conspicuously white and cottony in appearance. with its southern boundary being at or slightly north of I-72. COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. They are slightly convex and are brown with a yellow-brown ridge down the back . Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. Females are inconspicuous and overwinter on twigs, and in the spring they rapidly grow and produce their characteristic white egg sac. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. but have a strong preference for Silver Maple. These little buggers are so tiny and sneaky. Cottony Maple Scale Characteristics. A favored host is silver maple, but it will attack other species of maple as well. This is best applied when the scale are in their younger nymph stages, so make sure to regularly check your landscape for pests. Insecticides are rarely needed in the landscape due to natural enemies and tolerance of trees. Pulvinaria innumerabilisThe cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. at. Cottony maple scale definition is - a brown oval soft scale (Pulvinaria innumerabilis) that in summer becomes covered with a white cottony secretion beneath which its eggs are laid, that is widespread in North America, and that attacks and often kills various native and cultivated trees and shrubs. Young females have a dark stripe down the middle and mottling at the sides. If practical, improve plant sites to reduce stress and promote growth. Twice-stabbed lady beetles and certain wasps and flies are among the natural enemies that help to control cottony maple scale. Its favored host is maple trees, although it has been found on a number of other species as well. Also blacksooty mold. If infestations are heavy and sooty mold is objectionable, spray horticultural oil in the dormant season. Immature forms (crawlers) are flattened and brown to yellowish green in color; however, the conspicuous, cottony egg sac of the mature female is two to three times the length of the scale … Cottony maple cushion scale belong to the soft bodied type. Cottony Cushion originates from Australia and is rumored to have come to the US by accident in the late 1800’s on a plant shipment. Print a PDF of this page: Cottony maple scale. Heavy infestations of this scale may cause yellowing, wilting and eventually branch dieback. Second, the scale is obvious and distinctive (a rare combination when talking about insect pests). 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. Cottony Maple Scale Characteristics. In extreme conditions, a tree may be killed. However, in large numbers they can cause premature leaf drop and twig dieback. Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. Cottony Cushion originates from Australia and is rumored to have come to the US by accident in the late 1800’s on a plant shipment. It is also known to be able to survive on honey and black locust, white ash, Euonymus, oak, boxelder, dogwood, hackberry, sycamore, beech, elm, willow, basswood, and poplar. https://en.wikipedia.org/w/index.php?title=Pulvinaria_innumerabilis&oldid=891399079, Creative Commons Attribution-ShareAlike License, This page was last edited on 7 April 2019, at 18:27. Mature cottony maple scales are small, flat, oval, brown insects without obvious legs, antennae or wings. Cottony maple scale reaches epidemic numbers on silver maple, but noticeable populations can occur on red maple. Cottony Maple Scale. Cottony taxus scale is a soft scale (produces a thin, waxy outer covering attached to insect) as opposed to a hard scale (produces a harder, outer shell not attached to the insect). The cottony maple leaf scale is so named because the females exude their eggs in an elongated, white, cottony structure called an ovisac which are stuck onto the underside of leaves. Maple cotton scale is found on several other common hardwood trees such as ash, elm and boxelder. The cottony camellia scale also is found on English ivy, yew, euonymus, holly, hydrangea, maple, mulberry, pittosporum, rhododendron and yew, the host by which it is also known as the cottony yew scale. Females without egg sacs are 1/8 inch (2-3 mm) long, flat, pale to dark brown and soft. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. Cottony cushion scale, Icerya purchasi, can infest a number of woody ornamentals and certain crops ().Common hosts in California are citrus, cocculus, nandina, and pittosporum. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. 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. The new scale nymphs crawl to the leaves where they settle on the undersurface and begin a sedentary existence of feeding on the tree's sap. Its favored host is maple trees, although it has been found on a number of other species as well. Honeydew is the sugary, liquid waste excreted by scale insects. The biggest problem is the honeydew dripping down on decks, picnic tables, lawn chairs and parked cars. To monitor for this pest, look for tiny (1/8 inch long), oystershell shaped, and brown to gray scale covers on the bark of wilting or dead branches. Pulvinaria innumerabilisThe cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. The cottony white egg sacs of this soft scale appear on undersides of leaves (Figure 1) in May and egg hatch (Figure 2) occurs during June. The cottony maple leaf scale is so named because the females exude their eggs in an elongated, white, cottony structure called an ovisac which are stuck onto the underside of leaves. Cottony maple scale Pulvinaria innumerabilis. It looks like a Cottony Maple Scale (Pulvinaria innumerabilis) (the BugLady loves that species name), or something closely related to it. They become active and feed on the leaves between June and July. Cottony camellia scale and cottony maple scale are the other common species. Control measures must be timed to coincide with hatching of the crawler stage which usually occurs in early summer for cottony scales. REC, Lower Eastern Shore 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 camellia scales, Pulvinaria floccifera, are cream to tan, elongate oval, and relatively flat.They are also called cottony taxus scales as this scale is a fairly common pest of yew. Frequently, feeding results in the secretion of a clear sticky substance called honeydew. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. Mature female scales are brown, roundish, and about one-quarter inch in diameter. The body is covered with flakes of clear wax. Heavy infestations in the spring may cause the leaves to turn light green. They are firmly attached to the twigs and branches of various trees and may be ¼ to ⅜ inch in diameter. Honeydew (a sticky substance produced by the scale insects as they feed) and sooty mold (a black fungus that grows on top of the honeydew, see photo below) are the primary problems caused by this insect. The cottony camellia scale is most commonly reported on holly in Kentucky, but it is also found on other hosts, including yew, euonymous, maple, and hydrangea. REC, Dogwood Insect Pests: Identification and Management, Flowering Dogwood Trees: Selection, Care, and Management of Disease Problems, Why Are Leyland Cypress Trees Turning Brown, Azaleas and Rhododendrons: Common Diseases and Abiotic Problems, Boxwood: Preventing and Managing Common Pests and Diseases, Diagnosing Problems of Azaleas and Rhododendrons, Ornamental Fruit Trees: Preventing, Diagnosing, and Managing Problems. First, the cottony maple scale prefers maples, particularly silver maple, but may occur on almost any hardwood tree or shrub. Imidacloprid, a systemic insecticide, only controls soft scales. These little buggers are so tiny and sneaky. It is designed to teach about the lifecycle and habits of the cottony cushion scale and the predatory vedalia beetle. The cottony camellia scale is most commonly reported on holly in Kentucky, but it is also found on other hosts, including yew, euonymous, maple, and hydrangea. Cottony camellia scale and cottony maple scale are the other common species. Cottony maple scale usually does not cause serious injury to other trees. These scales also produce large amounts of liquid waste Cottony taxus scale on yew. The cottony mass resembles popcorn and, if the population is high, the ‘kernels’ will line up along the branches and twigs. Cottony taxus scale is most commonly found on yews and hollies in this area. Adult females are about 1/8 inch long, oval and yellowish tan with a brown margin. Cottony maple scale is sometimes mistaken for Cottony Maple Leaf Scale (P. acericola). The females mature when the plant resumes growth in the spring. For cottony cushion scale, there are some control options. Cottony maple scale is a food source for many predaceous insects and parasites. Females are inconspicuous and overwinter on twigs, and in the spring they rapidly grow and produce their characteristic white egg sac. It is also reported on beautyberry, jasmine, mulberry, and hydrangea. You can find these now on their most common hosts: maple and dogwood. It also is known to survive on other species of maple, honey and black locust, white ash, euonymus, oak, boxelder, dogwood, hackberry, sycamore, beech, elm, willow, basswood, and poplar. Issue 8, June 11, 2010. I say obvious because there was definitely something that wasn’t right with the plant. Pulvinaria innumerabilis. Cottony Cushion Scale and the Predatory Vedalia Beetle This course was developed for pest management professionals, pest control advisors, pesticide applicators, and growers. Cottony camellia scales, Pulvinaria floccifera, are cream to tan, elongate oval, and relatively flat.They are also called cottony taxus scales as this scale is a fairly common pest of yew. The tree may become weak if the infestation is severe and repeats for several years. Both scales produce white, cottony ovisacs, and both have wide host ranges; however, as its common name implies, cottony maple leaf scale produces its ovisacs on the underside of its host's leaves. The female will deposit 1,500 to 3,000 eggs before she dies. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. The eggs hatch in June and July. If abundant, a sooty mold fungus may colonize the honeydew, resulting in a black sooty appearance on the leaves, twigs, and branches. During the growing season use horticultural oil or insecticidal soap to conserve beneficials. These eggs hatch from mid-June to August, and the young nymphs called scale crawlers emerge… Cottony Maple Scale (Pulvinaria innumerabilis) is a soft scale insect pest that commonly attacks maple trees, but can be found on a variety on hosts.Usually it is just a nuisance, but in very severe infestations, it can kill weakened trees or branches on otherwise healthy trees. And they will ruin your citrus, unless you get it under control. They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. Cottony Cushion Scale had taken over, right under my nose! Cottony camellia scale is a soft scale that feeds on camellia, holly, yew, euonymus, sweetbox, and maple. Scale insect control. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. Cottony Scale insects produce cottony egg masses from which young crawlers emerge. Cottony maple scale definition is - a brown oval soft scale (Pulvinaria innumerabilis) that in summer becomes covered with a white cottony secretion beneath which its eggs are laid, that is widespread in North America, and that attacks and often kills various native and cultivated trees and shrubs. Honeydew often drops onto leaves or plants below. Inspect your red maple trees to determine what kind of scale insects you have by shaking the red maple tree’s branches over a sheet of paper and looking for scale insects. Pulvinaria innumerabilis. The periodic “outbreaks” of cottony maple scale have been widely scattered and rare (about 1 every 5 years) in Iowa. Cottony taxus scale is a soft scale (produces a thin, waxy outer covering attached to insect) as opposed to a hard scale (produces a harder, outer shell not attached to the insect). REC, Western Maryland The insect tends to populate the undersides of leaves/needles. I say obvious because there was definitely something that wasn’t right with the plant. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Young females have a dark stripe down the middle and mottling at the sides. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. 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) are the egg sacs. They look like tiny army helmets or turtle shells on the branches. Male scales are tiny, winged insects. Severely prune back heavily infested branches and protect new growth with insecticide applications. P. innumerabilis can be found on all species of maples (Acer spp.) Crawlers settle on… These insects overwinter as immature females on twigs. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. Immature females are flat and inconspicuous. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. These cottony masses can contains hundreds of eggs each.

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