The insect spends winter in an immature stage on twigs and branches, maturing in late May or early June. Consequently, they may not be effective where several layers of scale coverings have accumulated. Both adult and immature beetles feed on eggs and nymphs of the scale. Just before leaf drop, the small insects will move back to twigs and branches to spend the winter. Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. Use up and down arrow keys to explore within a submenu. A Scale insects are likely to be present on host plants all year round, but they become most obvious in late summer when the eggs are present, or in winter as the sooty mould builds up. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Natural Areas Conservation Training Program, Black walnut toxicity (plants tolerant of), Preventing construction damage to trees and shrubs, Trees and shrubs for the four seasons landscape, Sudden Oak Death, Ramorum Blight and Phytophthora ramorum, Eastern United States Wetlands Collection. Digital Media Library, Images: University of Kentucky Entomology, College of Agriculture, Food and Environment. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. The use of some products may not be legal in your state or country. Cottony Maple Scale . Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Initially a pest of citrus in California cottony cushion scale is now a pest of many crops including ornamentals throughout the southern US. The eggs hatch in June and July. 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. CAUTION! Cottony maple scale is sometimes mistaken for Cottony Maple Leaf Scale (P. acericola). The primary hosts of cottony maple scale (Pulvinaria innumerabilis) are silver maple and boxelder. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. While the residual life of these products is generally longer than oils and soaps, timing, coverage, and precautions on damage to some plant species are very similar to those for oils and soaps. They feed by sucking sap and some can weaken host plants, many excrete a sticky substance (honeydew), which allows the growth of sooty moulds. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. Use up and down arrow keys to explore within a submenu. Scales tend to thrive on stressed plants. Scale insects can be attacked by a variety of lady beetles, predatory mites, and small parasitic wasps. Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. Frequently, feeding results in the secretion of a clear sticky substance called honeydew. Home; Arborist Advice; The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. I’ve had two dwarf citrus trees – one lime, one Meyer lemon – for over two years now in the front of my home, and they did great the first year. Like horticultural oils, they require thorough coverage. Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. There is one generation each year. Scale control can be challenging and may need to be repeated over several seasons. Read the product label for guidelines on plant sensitivity and temperature restriction before buying and using these products. A variety of natural and synthetic insecticides are labeled for use as sprays to control scale crawlers on landscape trees and shrubs. Nada. A heavy infestation of scale may reduce the vigor of young or stressed trees if no measures are used. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. Within a submenu, use escape to move to top level menu parent. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. In severe cases the tree may die. 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. A favored host is silver maple, but it will attack other species of maple as well. Cottony cushion scale is an exotic pest that has been in the US for over a century. However, over-fertilization favors scale buildup. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. Sooty mold and shiny leaves should gradually disappear from plants that were infested with soft scales. Their eggs are white to pale yellow and are meshed in a white, cottony ovisac which may be up to 5mm wide and 12mm long. Stop by, email, or call. You’ll see these females in early summer, followed by scale crawlers hatching in late June or early July and crawling around on the undersides of the leaves. Male scales are tiny, winged insects. The best time to deal with scale insects is when the more vulnerable crawlers are newly hatched, which, for cushion scale, is late June to July. The females mature when the plant resumes growth in the spring. You can search, browse, and learn more about the plants in our living collections by visiting our BRAHMS website. Explore this online platform for Chicago-area residents to share their favorite stories about trees. The adult beetle is black with a red spot on each wing. The following menu has 3 levels. It is quite generalist and feeds on many ornamental plants such … 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 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. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. The males, lacking feeding mouth parts, die a few days after mating. Cottony maple scale occurs most commonly on silver maple, but it can also feed on other maple species, boxelder, basswood, birch, elm, and linden. Our trees. Honeydew often drops onto leaves or plants below. - Buy this stock vector and explore similar vectors at Adobe Stock Cottony Maple Scale, vintage illustration. They are firmly attached to the twigs and branches of various trees and may be ¼ to ⅜ inch in diameter. ENTFACT-427: Cottony Maple Scale  |  Download PDF. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Dormant oils are typically applied during February or March but may not be very effective against armored scales. Browse the curated collection and add your voice! They are slightly convex and are brown with a yellow-brown ridge down the back . Zilch. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. The cottony maple scale in Illinois . Cottony maple scale is most common on silver maples, but it can feed on other maple species, boxelder, basswood, birch, elm, and linden. Fast and free shipping free returns cash on delivery available on eligible purchase. The adult scale insect is often like a dark brown limpet, which attaches itself to the stem and branches of plants. Highly refined supreme, superior, or summer oils can be used on many trees and shrubs during the growing season. The trunk I believe is showing extensive canker damage from a fungal disease, possible tubercularia or nectria which could have been exacerbated through our tough winter temperatures this past winter. Severely prune back heavily infested branches and protect new growth with insecticide applications. In extreme conditions, a tree may be killed. Dr. Subba Reddy PalliDepartment Chair & State EntomologistS-225 Agricultural Science Center NorthLexington, KY 40546-0091859.257.7450entchair@uky.edu, UK Entomology: Vision, Mission, & Core Values, Nancy Cox, Ph.D. Serious outbreaks of the cottony maple scale may last for two to three years, but their numbers become greatly reduced when natural predators, including a number of wasps and fly parasites, are present. Eggs masses are conspicuously white and cottony in appearance. 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. Print a PDF of this page: Cottony maple scale. Cover title Topics: Scale-insects, Shrubs Diseases and pests, Trees Diseases and pests . Severely prune back heavily infested branches and protect new growth with insecticide applications. These soft scales are usually first noticed during the summer months when the female produces a conspicuous white egg sac, called an ovisac, that appears as a ¼- to ½-inch long ball of cotton. The Morton Arboretum is a 501(c)(3) nonprofit that relies on the generosity of members and donors. Use left and right arrow keys to navigate between menus and submenus. Adult scale insects are usually covered in waxy shell-like cover. However, over-fertilization favors scale buildup. New foliage of infested plants should have a healthier appearance once the scale burden has been removed. Dean They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. Identify cottony maple scale (Pulvinaria innumerabilis), the most common scale insect species to infest maple trees, by their adult female scales with cotton-like egg sacks on their hind ends. Cottony Maple Scale. If practical, improve plant sites to reduce stress and promote growth. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. Our future. Use left and right arrow keys to navigate between menus and submenus. S123 Ag Science – North Cottony maple scale is being found in DuPage, Livingston, and Grundy counties, on silver maple, sugar maple, honeylocust, green ash, and hawthorn. The success or failure of control efforts may not be readily apparent but here are some things to check. In spring the female matures and lays eggs. Crawlers are very susceptible to control measures as they move over plant surfaces to find a feeding spot. These scales also produce large amounts of liquid waste (honeydew) so leaves may be shiny and sticky and black sooty mold fungus may cover branches and the trunk. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement made by The Morton Arboretum. . This is due in part to the protection from contact insecticides provided by the waxy coverings over immobile, mature scales. Not one little blossom for a year and a half. Proper timing of insecticide applications is a major key to success. It can also infest other maples, white ash, hackberry, dogwood, beech, apple, oak, linden, elm, black and honey locust. Egg sacks appear as white cottony masses emerging from beneath the … Feeding by the scales may result in heavy concentrations of honeydew. Management . Cottony azalea scale has much more of a “cottony” appearance and during the egg-laying stage will appear much larger than azalea bark scale. Twice-stabbed lady beetles and certain wasps and flies are among the natural enemies that help to control cottony maple scale. Use pesticides safely and wisely; read and follow label directions. The eggs hatch in late June and July and the crawlers move to the leaves. The female will deposit 1,500 to 3,000 eggs before she dies. If scale populations are heavy, dieback of branches and twigs may result. If practical, improve plant sites to reduce stress and promote growth. Philanthropy & Alumni They produce one generation per year. Egg sacs of cottony maple scale. Pesticide recommendations in this publication are registered for use in Kentucky, USA ONLY! Scales tend to thrive on stressed plants. Contact the Plant Clinic (630-719-2424 or plantclinic@mortonarb.org) for current recommendations. Buy The Cottony Maple Scale in Illinois by Forbes, Stephen Alfred 1844-1930 online on Amazon.ae at best prices. The body is covered with flakes of clear wax. Mature cottony maple scales are small, flat, oval, brown insects without obvious legs, antennae or wings. This scale looks like cotton balls attached to the stem. Dead soft scales often fall off of the plant. Buds should break a little earlier than when the plant was infested and expanded leaves should have normal color and turgor. Cottony Maple Scale on Silver Maple Leaf Damage Damage to the host tree is caused in several ways. These eggs hatch from mid-June to August, and the young nymphs called scale crawlers emerge… From top level menus, use escape to exit the menu. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. 859-257-4772, Students   /   Arborist Dave Leonard recently brought samples to the on black gum. Departments & Units   /   Lady beetle adults and larvae can be seen but mites and parasitic wasps are very difficult to see. This tiny insect, the Cottony Cushion Scale, is a friggin’ thorn in my citrus trees sides. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication. Jul 16, 2018 - The cottony maple scale, Pulvinaria innumerabilis (Rathvon), is a highly modified insect pest that commonly attacks silver and red maples in Ohio. 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. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… Cottony maple cushion scale belong to the soft bodied type. The eggs hatch into pale yellow-green crawlers in late June or July and migrate to the underside of leaves, feeding along the veins and midrib by withdrawing sap from the plant parts. Applications must target newly hatched scale crawlers which are active in June and July. Before leaves begin to drop in fall, the immature females migrate to the twigs where they attach themselves for overwintering. 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