Digital Media Library, Images: University of Kentucky Entomology, College of Agriculture, Food and Environment. Building the urban forest for 2050. Use up and down arrow keys to explore within a submenu. Cottony Maple Scale, vintage illustration. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… Use pesticides safely and wisely; read and follow label directions. Dean 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. Scale control can be challenging and may need to be repeated over several seasons. Use left and right arrow keys to navigate between menus and submenus. S123 Ag Science – North 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. Eggs hatch during June and July and crawlers move to the lower surface of leaves where they settle feed on sap for the rest of the summer. Imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control Concentrate) is applied as a drench around the root zone of infested plants. Male scales are tiny, winged insects. 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. 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). 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. They produce one generation per year. use escape to move to top level menu parent. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. Cottony Maple Scale . Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. Dormant oils are typically applied during February or March but may not be very effective against armored scales. Buds should break a little earlier than when the plant was infested and expanded leaves should have normal color and turgor. Following a recommended fertility program and watering regime will promote plant health. Egg sacks appear as white cottony masses emerging from beneath the … Scale insects can be attacked by a variety of lady beetles, predatory mites, and small parasitic wasps. Explore this online platform for Chicago-area residents to share their favorite stories about trees. Our future. 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. Departments & Units   /   At maturity, the females produce the white, cottony egg masses, called ovisacs, over a period of several weeks. Not one little blossom for a year and a half. This scale looks like cotton balls attached to the stem. Get PDF (4 MB) Abstract. This is due in part to the protection from contact insecticides provided by the waxy coverings over immobile, mature scales. From top level menus, use escape to exit the menu. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. ENTFACT-427: Cottony Maple Scale  |  Download PDF. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. Extension   /   Cottony Maple Scale. Stop by, email, or call. 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. Each mass usually contains 1,000-1,500 eggs. Cottony maple scale is being found in DuPage, Livingston, and Grundy counties, on silver maple, sugar maple, honeylocust, green ash, and hawthorn. Mature cottony maple scales are small, flat, oval, brown insects without obvious legs, antennae or wings. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Cottony maple scale is most easily noticed in late spring. Cottony cushion scale is an exotic pest that has been in the US for over a century. Twice-stabbed lady beetles and certain wasps and flies are among the natural enemies that help to control cottony maple scale. Initially a pest of citrus in California cottony cushion scale is now a pest of many crops including ornamentals throughout the southern US. 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. Use up and down arrow keys to explore within a submenu. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Use left and right arrow keys to navigate between menus and submenus. 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. If scale populations are heavy, dieback of branches and twigs may result. A favored host is silver maple, but it will attack other species of maple as well. In severe cases the tree may die. In late summer, mature winged males mate with immature females. Our trees. A variety of natural and synthetic insecticides are labeled for use as sprays to control scale crawlers on landscape trees and shrubs. 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. They are slightly convex and are brown with a yellow-brown ridge down the back . However, over-fertilization favors scale buildup. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): http://www.biodiversitylibrary... (external link) 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. The use of some products may not be legal in your state or country. Dead soft scales often fall off of the plant. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. Of course, ALWAYS READ AND FOLLOW LABEL DIRECTIONS FOR SAFE USE OF ANY PESTICIDE! But then… nothing. Cottony maple scale is most common on silver maples, but it can feed on other maple species, boxelder, basswood, birch, elm, and linden. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. A heavy infestation of scale may reduce the vigor of young or stressed trees if no measures are used. Within a submenu, use escape to move to top level menu parent. The eggs hatch in late June and July and the crawlers move to the leaves. - Buy this stock vector and explore similar vectors at Adobe Stock 1). Cottony Scale insects produce cottony egg masses from which young crawlers emerge. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. You can conserve natural enemies by using insecticidal soaps and oils which have limited impact on beneficial species in comparison to other control alternatives. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. 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. There is one generation each year. However, it may need to be applied several weeks before crawlers are active for best results. Honeydew often drops onto leaves or plants below. Following a recommended fertility program and watering regime will promote plant health. 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