Immature females are flat and inconspicuous. Adult cottony cushion scale female with … 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. (76) Photo: Whitney Cranshaw Cottony maple scale crawlers along leaf veins in the summer. but have a strong preference for … 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. Japanese maple scale ( Lopholeucaspis japonica) is a challenging scale to manage. The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. A variety of natural and synthetic insecticides are labeled for use … Cottony camellia scale and cottony maple scale are the other common species. Crawlers settle on… While conspicuous, P. innumerabilis infestations usually have little impact on established trees. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. Japanese maple scales small size, ability to blend in, and long crawler emergence period make it difficult to control. Well-timed applications can eradicate the scale larvae. One spray during that period … If practical, improve plant sites to reduce stress and promote growth. Eggs masses are conspicuously white and cottony in appearance. Crawler sprays of acephate (Orthene), befenthrin (Talstar), cyfluthrin (Tempo), insecticidal soap, malathion, or summer oil can also be applied in July when the crawlers are active. Oleander scale; Oystershell scale; San Jose scale; Carpenterworm; Eriophyid mites; Flatheaded borers. Severely infested trees look like they are covered with strings of popcorn. However, it may need to be applied several weeks before crawlers are active for best results. As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). Japanese maple. Soft scales feed in vascular components of plants. Philanthropy & Alumni Egg sacs may grow to as large as 1/2 inch in diameter and may contain up to 1000 eggs. 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. The body of the scale is white and resembles a kernel of popcorn. The use of some products may not be legal in your state or country. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. Painted maple aphid ; Armored scales . They are black, flat, and oval. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. (76) Photo: John Davidson be controlled as crawlers and immatures. Pulvinaria innumerabilis . 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 body, or up to 6 mm. Cottony maple scale is being found in DuPage, Livingston, and Grundy counties, on silver maple, sugar maple, honeylocust, green ash, and hawthorn. 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. The pest is very common in the tri-city area of Michigan at this time. ... Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. This water soluble insecticide is taken up by the roots and transported throughout the plant where it is ingested by sap feeding insects. New foliage of infested plants should have a healthier appearance once the scale burden has been removed. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. 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. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Scale insects can be attacked by a variety of lady beetles, predatory mites, and small parasitic wasps. There are many species of scale insects that feed on a wide range of host plants. Heavy infestations can cause leaves to turn yellow to light green and may cause stunted leaf growth. You can find these now on their most common hosts: maple and dogwood. Severely prune back heavily infested branches and protect new growth with insecticide applications. The insects feed on foliage, reducing vigor of the plant and causing twig dieback. The insect forms a cottony mass on the lower sides of branches. Honeydew on Japanese maple The majority of acer bugs leave behind sooty substances called honeydew on plants. Consequently, they may not be effective where several layers of scale coverings have accumulated. This ¼ to ½ inch roundish sac looks like a cotton ball and is quite conspicuous, especially when there are many scales on the host plant. Cottony cushion scale is usually accompanied by blackish sooty mold growth as show on these citrus leaves. Figure 8. Boxelder bugs; Diseases. At that time, the twice-stabbed lady beetle adults will be under loose bark and not harmed by the spray. ... Chinese holly and jasmine although it can infest English ivy, euonymous, hydrangea, maple, mulberry, pittosporum, and rhododendron. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Following a recommended fertility program and watering regime will promote plant health. The distinguishing characteristic of these soft scales is the white egg sac (ovisac) produced by female scales in summer. Lady beetle adults and larvae can be seen but mites and parasitic wasps are very difficult to see. Applications must target newly hatched scale crawlers which are active in June and July. Following a recommended fertility program and watering regime will promote plant health. They are also called cottony taxus scales as this scale is a fairly common pest of yew. ... Dormant-oil treatments control overwintering female nymphs on most hosts (except sugar and Japanese maple) after leaf drop in the fall and before budbreak in the spring. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. 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. The females mature when the plant resumes growth in the spring. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. The 1/4-inch white cottony ovisac, or egg sac, is deposited on bark. 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. Soaps leave no residue so repeated applications may be needed for some pests. Consequently, they may not be effective where several … but have a strong preference for Silver Maple. Management. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Scales tend to thrive on stressed plants. S123 Ag Science – North Imidacloprid, a systemic insecticide, only controls soft scales. This provides a means of scale control without reliance on sprays. Sooty mold and shiny leaves should gradually disappear from plants that were infested with soft scales. Invertebrates. Cottony maple cushion scale belong to the soft bodied type. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. Large amounts of … Severely infested trees look like they are covered with strings of popcorn. Proper timing of insecticide applications is a major key to success. Imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control Concentrate) is applied as a drench around the root zone of infested plants. The success or failure of control efforts may not be readily apparent but here are some things to check. Live scales should produce a liquid when mashed, dead scales will be dry and not "bleed" when crushed. CAUTION! Aphids. In some cases, the scales are quite numerous. Extension   /   Aphids; Azalea Lace Bug (Stephanitis pyroides) Azalea Leafminer (Caloptilia azaleella) Cottony Maple Scale; Dogwood Borer (Synanthedon scitula) ... Cottony Maple Scale. In the United States, it was first found on the east coast, but is rapidly expanding its range. Adult females are about 3/16 inch long. Cottony maple scale is most easily noticed in late spring. Residential Recommendation Skip to Residential Recommendation. Its favored host is maple trees, although it has been found on a number of other species as well. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. Read the product label for guidelines on plant sensitivity and temperature restriction before buying and using these products. The body is covered with flakes of clear wax. Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. Once settled on the plant, they begin to secrete a covering and are protected by it. Cottony Maple Scale; May 18, 2005: ... but do not apply it to sugar or Japanese maple. If twice-stabbed lady beetle larvae or adults … ... such as Japanese maple, so check the label for information about the plant species that you intend to treat. Anthracnose; Bacterial leaf … Research   /   Scale insects are a unique group, that look quite different from other insects. Timing pesticide application to the crawler stage is very important. Pulvinaria innumerabilis Pest description and damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. Whiteflies; Nursery. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. 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. Just before leaf drop, the small insects will move back to twigs and branches to spend the winter. They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. If practical, improve plant sites to reduce stress and promote growth. Dead soft scales often fall off of the plant. There are 2 generations a year in Maryland. 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. Like horticultural oils, they require thorough coverage. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. Lexington, KY 40546-0091 1). However, over-fertilization favors scale buildup. 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). Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. These products may burn the foliage of sensitive plants, such as Japanese maple, so check the label for information about the plant species that you intend to treat. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication. 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. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. Cottony cushion scale outbreaks have been observed following use of this insecticide because the vedalia beetles were removed and the insecticide didn’t control the pest. You can conserve natural enemies by using insecticidal soaps and oils which have limited impact on beneficial species in comparison to other control alternatives. 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. Scale, mites, and mealybugs all produce this cottony, white fuzzy stuff which you’ll find on your acer leaves, especially younger ones. In their juvenile growth stage, they are referred to as \"crawlers\". The insect forms a cottony mass on the lower sides of branches. Plant surfaces to find a feeding spot waxy, cottony-appearing egg sacs in which they lay 500 more... Growth as show on these citrus leaves can infest English ivy, euonymous hydrangea... 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Labeled for use in Kentucky, USA only measures as they grow and develop, the scale burden been.
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