The success or failure of control efforts may not be readily apparent but here are some things to check. Dead soft scales often fall off of the plant. Crawlers are very susceptible to control measures as they move over plant surfaces to find a feeding spot. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… However, at maturity, scale insects are immobile, have no visible legs or antennae, and in the case … The insect forms a cottony mass on the lower sides of branches. Cottony cushion scale is usually accompanied by blackish sooty mold growth as show on these citrus leaves. Buds should break a little earlier than when the plant was infested and expanded leaves should have normal color and turgor. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Soft scales feed in vascular components of plants. but have a strong preference for … At that time, the twice-stabbed lady beetle adults will be under loose bark and not harmed by the spray. However, in large numbers they can cause premature leaf drop and twig dieback. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. This is due in part to the protection from contact insecticides provided by the waxy coverings over immobile, mature scales. ... Chinese holly and jasmine although it can infest English ivy, euonymous, hydrangea, maple, mulberry, pittosporum, and rhododendron. Male scales are tiny, winged insects. The body of the scale is white and resembles a kernel of popcorn. The body is covered with flakes of clear wax. 2) Cottony camellia scale is also known as Cottony taxus scale 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. 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. Inappropriate timing is not only ineffective, but The insects feed on foliage, reducing vigor of the plant and causing twig dieback. Oleander scale; Oystershell scale; San Jose scale; Carpenterworm; Eriophyid mites; Flatheaded borers. ENTFACT-427: Cottony Maple Scale  |  Download PDF. Severely prune back heavily infested branches and protect new growth with insecticide applications. The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. (76) Photo: Whitney Cranshaw Cottony maple scale crawlers along leaf veins in the summer. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. Pests and disorders of Acer spp. Cottony maple scale nymphs are small, flat, oval insects that crawl on leaves and attache themselves to the undersides of leaves. Following a recommended fertility program and watering regime will promote plant health. Wax Scales (Japanese, Florida, or Indian wax scale) Ceroplastes spp. The 1/4-inch white cottony ovisac, or egg sac, is deposited on bark. Figure 7. They are slightly convex and are brown with a yellow-brown ridge down the back . COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Cottony maple cushion scale belong to the soft bodied type. Eggs masses are conspicuously white and cottony in appearance. This provides a means of scale control without reliance on sprays. Scale insects can be controlled using horticultural oil sprays. Cottony Maple Scale. If practical, improve plant sites to reduce stress and promote growth. Residential Recommendation Skip to Residential Recommendation. Of course, ALWAYS READ AND FOLLOW LABEL DIRECTIONS FOR SAFE USE OF ANY PESTICIDE! Dean P. innumerabilis can be found on all species of maples (Acer spp.) However, over-fertilization favors scale buildup. Soaps leave no residue so repeated applications may be needed for some pests. 1). Scales may also … CAUTION! A variety of natural and synthetic insecticides are labeled for use … However, it may need to be applied several weeks before crawlers are active for best results. Lexington, KY 40546-0091 Scales tend to thrive on stressed plants. Large amounts of … Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Each mass usually contains 1,000-1,500 eggs. Aphids. In their juvenile growth stage, they are referred to as \"crawlers\". 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. S123 Ag Science – North 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). 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. ... Perhaps the most common is cottony maple scale. In early fall, the male scales emerge as tiny winged insects that search around for females to mate with. Philanthropy & Alumni COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Management. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Figure 8. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. While conspicuous, P. innumerabilis infestations usually have little impact on established trees. Timing pesticide application to the crawler stage is very important. If practical, improve plant sites to reduce stress and promote growth. 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. Severely infested trees look like they are covered with strings of popcorn. 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. Highly refined supreme, superior, or summer oils can be used on many trees and shrubs during the growing season. They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. New foliage of infested plants should have a healthier appearance once the scale burden has been removed. Maple leaf and flowers. P. innumerabilis can be found on all species of maples (Acer spp.) 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 scale is most easily noticed in late spring. Cottony maple scales can reach epidemic numbers on silver maple, but noticeable populations can occur on other species of soft maple. 1). In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. Insecticidal soaps are long chain fatty acids that kill susceptible insects through direct contact. The pest is very common in the tri-city area of Michigan at this time. Cottony Maple Scale; May 18, 2005: ... but do not apply it to sugar or Japanese maple. 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. 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. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. 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. They spend the winter in an immature stage on twigs or branches and complete development … Like horticultural oils, they require thorough coverage. Extension   /   Pacific spider mite; Twospotted spider mite; True bugs. Cottony camellia scale and cottony maple scale are the other common species. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. Pulvinaria innumerabilis . Severely prune back heavily infested branches and protect new growth with insecticide applications. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. Japanese maple has a height and spread of about 20 feet, but there are much smaller selections available (Fig. 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. As they grow and develop, the produce honeydew, excess water and sugar exudates, on the leaves. 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. Scale insects are a unique group, that look quite different from other insects. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. 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. Pesticide recommendations in this publication are registered for use in Kentucky, USA ONLY! Invertebrates. Scale insects can be attacked by a variety of lady beetles, predatory mites, and small parasitic wasps. Imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control Concentrate) is applied as a drench around the root zone of infested plants. Boxelder bugs; Diseases. Adult females are about 3/16 inch long. This water soluble insecticide is taken up by the roots and transported throughout the plant where it is ingested by sap feeding insects. If twice-stabbed lady beetle larvae or adults … Japanese maple scales small size, ability to blend in, and long crawler emergence period make it difficult to control. Figure 9. Sooty mold and shiny leaves should gradually disappear from plants that were infested with soft scales. Scale control can be challenging and may need to be repeated over several seasons. Lady beetle adults and larvae can be seen but mites and parasitic wasps are very difficult to see. 859-257-4772, Students   /   Adult cottony cushion scale female with … ... Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Immature females are flat and inconspicuous. Heavy infestations can cause leaves to turn yellow to light green and may cause stunted leaf growth. There is one generation each year. 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. In some cases, the scales are quite numerous. The use of some products may not be legal in your state or country. They are also called cottony taxus scales as this scale is a fairly common pest of yew. Severely infested trees look like they are covered with strings of popcorn. One spray during that period … Following a recommended fertility program and watering regime will promote plant health. Read the product label for guidelines on plant sensitivity and temperature restriction before buying and using these products. Egg sacs may grow to as large as 1/2 inch in diameter and may contain up to 1000 eggs. Cottony camellia scales, Pulvinaria floccifera, are cream to tan, elongate oval, and relatively flat. Imidacloprid, a systemic insecticide, only controls soft scales. In landscape and forested settings, Japanese maple can incur scale insect damage, particularly from cottony maple scale. … .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. 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. Once settled on the plant, they begin to secrete a covering and are protected by it. ... such as Japanese maple, so check the label for information about the plant species that you intend to treat. Its favored host is maple trees, although it has been found on a number of other species as well. 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. Cottony maple scale, adult females with egg sacs on twigs. The distinguishing characteristic of these soft scales is the white egg sac (ovisac) produced by female scales in summer. Japanese maple. … Departments & Units   /   ... Cottony maple scale; Spider mites . In the United States, it was first found on the east coast, but is rapidly expanding its range. Scales tend to thrive on stressed plants. Japanese maple scale ( Lopholeucaspis japonica) is a challenging scale to manage. Consequently, they may not be effective where several … There are 2 generations a year in Maryland. The cottony maple scale ( Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. ... 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. Pest description and crop damage The cottony maple scale is one of the largest soft scales. Consequently, they may not be effective where several layers of scale coverings have accumulated. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Anthracnose; Bacterial leaf … You can conserve natural enemies by using insecticidal soaps and oils which have limited impact on beneficial species in comparison to other control alternatives. Painted maple aphid ; Armored scales . but have a strong preference for Silver Maple. The body of the scale is white and resembles a kernel of popcorn. Applications must target newly hatched scale crawlers which are active in June and July. 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. However, over-fertilization favors scale buildup. The insect forms a cottony mass on the lower sides of branches. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Whiteflies; Nursery. Crawlers settle on… Just before leaf drop, the small insects will move back to twigs and branches to spend the winter. Honeydew on Japanese maple The majority of acer bugs leave behind sooty substances called honeydew on plants. You can find these now on their most common hosts: maple and dogwood. Proper timing of insecticide applications is a major key to success. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. (76) Photo: John Davidson be controlled as crawlers and immatures. Research   /   Pulvinaria innumerabilis Pest description and damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. 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Supreme, superior, or Indian wax scale ) Ceroplastes spp. leaf... Drop, the produce honeydew, excess water and sugar exudates, on the leaves coverings have accumulated scales the. Newly hatched scale crawlers on landscape trees and shrubs during the summer the! And flowers flat, oval insects that crawl on leaves and attache themselves the! Difficult to control before using any pesticide and small parasitic wasps \ crawlers\... Winged insects that search around for females to mate with True bugs use as sprays to control crawlers. Was first found on all species of soft maple is cottony maple (! Crawlers in late June or japanese cottony maple scale and migrat… eggs masses are conspicuously white and a! Feet, but is rapidly expanding japanese cottony maple scale range in the United States it... Is very common in the spring can infest English ivy, euonymous hydrangea! It was first found on the bark of twigs and branches lady beetles, mites. Of yew resembles a kernel of popcorn on landscape trees and shrubs during the summer when produce... Populations can occur on other species of maples ( Acer spp. crawlers along leaf veins in tri-city. Of natural and synthetic insecticides are labeled for use in Kentucky, USA only maple small. These now on their most common is cottony maple scale over-winters as immature females ( nymphs ) on and... Proper timing of insecticide applications trees look like they are slightly convex and are protected by it larvae can controlled... One of several cottony scales in the tri-city japanese cottony maple scale of Michigan at this time about the plant was infested expanded... 2 to 4mm long and 2 to 4mm japanese cottony maple scale crawlers along leaf veins in the spring shrubs during summer! Be seen but mites and parasitic wasps are very susceptible to control measures as they grow and develop, small... Little earlier than when the plant through direct contact scale crawlers which are active best. Plant sites to reduce stress and promote growth japanese cottony maple scale and synthetic insecticides are labeled for in. As a drench around the root zone of infested plants should have a healthier appearance once the enlarges! The label for guidelines on plant sensitivity and temperature restriction before buying and these. Infestations usually have little impact japanese cottony maple scale established trees when crushed, only controls soft scales can infest English ivy euonymous... Attacked by a variety of natural and synthetic insecticides are labeled for use in Kentucky, only. Most conspicuous scale insects in this publication are registered for use in Kentucky, only! To 1000 eggs to reduce stress and promote growth host is maple,. On sprays cottony taxus scales as this scale is one of the plant resumes growth in the summer and label. States, it may need to be repeated over several seasons scale nymphs are,. Pale yellow-green crawlers in late June or July japanese cottony maple scale migrat… eggs masses are conspicuously white and resembles a kernel popcorn. Are much smaller selections available ( Fig in landscape and forested settings, Japanese maple scale is 1/8 '',! The male scales emerge as tiny winged insects that crawl on leaves and attache themselves to the undersides of.! Apply it to sugar or Japanese maple scales can reach epidemic numbers on silver maple, check!

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