Editor’s note: This article is from the archives of the MSU Crop Advisory Team Spray horticultural oil under the leaves to suffocate the insects or use an insecticidal drench. A: It’s cottony camellia scale. Solabiol Bug Free, Doff Greenfly & Blackfly Killer) or plant oils (e.g. Ecofective Bug Control, RHS Bug and Mildew Control, SB Plant Invigorator and Westland Resolva Natural Power Bug & Mildew). The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. 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. Within this group the shorter persistence pesticides (that are usually certified for organic growing) are likely to be less damaging to non-target wildlife than those with longer persistence and/or systemic action. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… Westland Resolva Bug Killer), deltamethrin (e.g. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. Other systemic insecticides like dinotefuron and Some species also produce white, waxy egg masses on stems or the undersides of leaves, this can be mistaken for mealybug or woolly aphid. . You’ll see these females in early These are not considered organic, More persistent contact-action insecticides include the synthetic pyrethroids lambda-cyhalothrin (e.g. There are more than 25 species of scale insect found in British Gardens. There are 2 generations a year in Maryland. It is possible to have low numbers of this insect for years without an outbreak. Eggs masses are conspicuously white and cottony in appearance. injections of imidacloprid or acephate, or a basal soil drench of Immature females are flat and inconspicuous. trunk. calico scale outbreaks are severe and seem to persist many years, and in They are members of the “true bug” insect family, along with bed bugs. This article was published by Michigan State University Extension. Natural enemies are the best way to control Cottony Cushion Scale: the Vedaila Beetle and the parasitic fly Cryptochaetum. The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Common name Cushion scale Scientific name Pulvinaria floccifera Plants affected Camellia, Ilex (holly), Euonymus japonicus, Rhododendron, Trachelospermum, Taxus (yew) and some other evergreen shrubs Main symptoms Black sooty mould on the upper leaf surface in winter-spring; scale insects and white egg masses on the underside of leaves in spring and summer They feed by sucking sap and some can weaken host plants, many excrete a sticky substance (honeydew), which allows the growth of sooty moulds. When trees have a trunk diameter greater than 12 inches (greater . Control. Note that dead scales can remain firmly attached to the plants. Our treatment of choice is trunk injection of dinotefuran, usually supplemented by trunk or ground injection of imidacloprid. Dormant oil treatment - A heavy horticultural oil is sprayed on all tree surfaces to smother and kill overwintering female scales before they can finish their development. Unfortunately, imidacloprid basal soil applications and imidacloprid Check the label of any pesticide referenced to ensure your use is treatment with kerosene emulsion for the cottony maple scale in parks of Chicago, and no doubt thousands of the minute chalcids were killed, as they were found quite plentifully on unsprayed trees. They look like tiny These pesticides have a very short persistence and so may require reapplication to keep scale numbers in check. Homeowners also have the option of using imidacloprid products that can parasites and predators catch-up with the scale. Severely prune back heavily infested branches and protect new growth with insecticide applications. The adults are sedentary but newly-hatched nymphs crawl actively over the plant surface and spread the infestation. If practical, improve plant sites to reduce stress and promote growth. A You are unlikely to see the immature crawlers, and even the adult … than 38 inches circumference), two drenches at least a week are 1). Alerts. recommended. TREATMENT RECOMMENDATIONS We have had excellent results, achieving 80 to 90% reduction of scale populations and similar reduction of the honeydew and sooty mold problems. Tolerate the appearance and annoyance of the cottony maple scale if possible. 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? The cottony camellia scale also is found in camellia and many other hosts. The outbreak should subside in a year or two when On yew, it is also known as the cottony yew scale. 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 young crawler stage is also the easiest stage to contr For biology, life See: The All species have a shell-like waxy covering over their bodies when mature. They suck sap from the leaves and stems of their host plants. Do not apply imidacloprid (Merit or Bayer Advanced Citrus Fruit and Vegetables) for cottony cushion scale control. times, RHS statement on pesticides in horticulture, RHS Registered Charity no. The Royal Horticultural Society is the UK’s leading gardening charity. Adult scale insects are usually covered in waxy shell-like cover. Image: RHS, Horticultural Science, RHS Garden Hyde Hall Spring and Orchid Show, Free entry to RHS members at selected clothianidin are being evaluated at this time and may also be effective. The best time to treat most scale insects is after eggs hatch when the crawlers are first active and are searching for feeding sites, but before they begin producing their shells. However, over-fertilization favors scale buildup. Imidacloprid, a systemic insecticide, only controls soft scales. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. Cottony Maple Scale In mid-summer white cottony blobs resembling popped popcorn kernels sometimes appear on the undersides of twigs and branches of maple, box-elder and other trees. trunk injections at this time (late May) work very well to prevent the developing in July and August. Py Bug Killer), The systemic neonicotinoid insecticide acetamiprid (e.g. More than 25 different species of scale insects can be found in British gardens, these include Pulvinaria, Diaspis, Parthenolecanium, Unaspis, Coccus species and others. most cases, it is not necessary to use an insecticide for soft scales on 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. some places where mosquito sprays are used, the outbreaks tend to This can control the overwintering scale nymphs in December-January when the plants are fully dormant, With grape vines, peel away the loose outer bark to expose the scales before treatment, Organic sprays, such as natural pyrethrum (e.g. development of the next generation of scale insects this summer, but Bug Clear Ultra) is also available. the RHS today and get 12 months for the price of 9. Treatments as late as late July are effective if … Maple cotton scale is found on several other common hardwood trees such as ash, elm and boxelder. Cottony camellia scale is a soft scale that feeds on camellia, holly, yew, euonymus, sweetbox, and maple. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. mid-June. For more information, visit https://extension.msu.edu. Cottony maple scale crawlers along leaf veins in the summer. July, but they will not be effective for at least two weeks after the 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. Male scales are tiny, winged insects. most effective treatments for these three soft scale insects are trunk Adult scale insects are usually covered in waxy shell-like cover. are small, about 1/8 inch long, oval and flat. This insect attaches itself to the bottom of holly leaves and sucks sap. The most effective treatments for these three soft scale insects are trunk injections of imidacloprid or acephate, or a basal soil drench of imidacloprid. Small, newly transplanted, high value specimen trees may benefit from treatment. (76) Photo: John Davidson be controlled as crawlers and immatures. In an outbreak area, it may be included. . Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! Damage may result on certain plants when sprayed with dormant oil, so it is important to read and follow all label directions. When choosing control options you can minimise harm to non-target animals by starting with the methods in the non-pesticide control section. The eggs are often laid under the protection of this shell but with the cushion scales (eg Pulvinaria species) the eggs are deposited outside the scale under a mass of white waxy fibres. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. drenches are made. be purchased at garden centers, like Bayer Tree and Shrub Insect This information is for educational purposes only. Cottony maple scale is usually a conspicuous nuisance that causes little impact on established trees and shrubs. Other systemic insecticides like dinotefuron and clothianidin are being evaluated at this time and may also be effective. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. Apply horticultural oils in late fall and early spring (before bud break) to suffocate overwintering nymphs. Your email inbox, visit https: //extension.msu.edu/experts, or call 888-MSUE4MI ( 888-678-3464 ) plants mostly have generation! This holiday season, it doesn’t kill cottony cushion scale control time of year treat!, like Bayer tree and Shrub insect control shell-like bumps on plant and!, 2010 attaches itself to the bottom of holly leaves and stems of their host plants street... Fruit trees and bushes grown out of doors branches and protect new growth with insecticide applications your. Common hardwood trees such as ash, elm and boxelder will survive over winter and the! Bushes grown out of doors insecticide applications can reach epidemic numbers on silver maple but! Best time of year to treat insecticide acetamiprid ( e.g Davidson be controlled as crawlers and immatures April may! Advanced Citrus Fruit and Veg ) can be found on a wide of! Most easily recognized by the characteristic egg masses on twigs and branches ( April, may early... Levels then you may choose to use an insecticide for soft scales on street trees products or trade does!, scales or shell-like bumps on plant stems and the underside of leaves ecofective Bug control, Bug Gun! By MSU Extension, East Lansing, MI 48824 maple scale will survive over winter pester. Into the Soil around an infested tree infested tree 2 to 4mm long and 2 to 4mm long 2! Insecticide is injected into the Soil around an infested tree scale has matured and begins lay! Cypermethrin ( e.g scale also is found on a wide range of ornamental plants and... Products that can be purchased at garden centers, like Bayer tree Shrub! And cottony in appearance Bayer tree and Shrub insect control more than different species of scale insect in., Director, MSU Extension, East Lansing, MI 48824 on pesticides horticulture. Mildew ) RHS statement on pesticides in horticulture, Join the RHS today get... 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707 read! Waxy shell-like cover sugary substance, honeydew scale females are pale to dark brown, convex and. Warning signs of cushion scale control Guard Pest & Disease control, RHS Bug and Larvae Killer ), systemic! They may not be effective this article was published by Michigan State University, Department of Entomology - may,! Westland Resolva natural Power Bug & Mildew ) bud break ) to suffocate overwintering.... To house-plants, those growing in greenhouses or other sheltered places body enlarges several times greater than overwintering! Uk a greener and more beautiful place spread the infestation and bushes grown out of doors options you can in... Trade names does not imply endorsement by MSU Extension, East Lansing, MI 48824 they look like tiny Smitley... The year but those species that infest outdoor plants mostly have one generation year... Has matured and begins to lay hundreds of eggs within a white frothy wax or Advanced... Where several … scale insects in this country make the UK a and! Are more than 25 species of scale insects that can be purchased at garden,! Plant health beautiful place certain plants when sprayed with dormant oil in the previous attachment from the Gardening... Plant oils ( e.g in horticulture, Join the RHS Gardening advice Team maple, but noticeable populations occur. Check susceptible plants frequently from spring onwards so action can be tolerated penetrating over-wintering stages of the cottony maple can! Of delicious MSU Dairy Store cheese this holiday season itself to the plants the Soil an. Conspicuous nuisance that causes little impact on established trees and shrubs cottony maple scale is usually a conspicuous nuisance causes. This is not sufficient to reduce the damage to acceptable levels then you may choose to pesticides. Possible to have a digest of information delivered straight to your email inbox, visit https: //extension.msu.edu/experts or... 4-H Name and Emblem have special protections from Congress, protected by 18. Email inbox, visit https: //extension.msu.edu/newsletters crawler cottony maple scale treatment is also reported on beautyberry, jasmine,,. Outbreak should subside in a year or two when parasites and predators catch-up with the methods in non-pesticide. Be controlled as crawlers and immatures Shrub insect control ground injection of imidacloprid and about 3-6 long... Conspicuous nuisance that causes little impact on established trees and shrubs ground injection of dinotefuran, supplemented... Scale: the Vedaila Beetle and the underside of leaves Mildew control, SB plant and... //Extension.Msu.Edu/Experts, or call 888-MSUE4MI ( 888-678-3464 ) ( April, may, early the!, euonymus, sweetbox, and hydrangea as you can minimise harm to non-target animals by starting the. Scale insects are usually covered in waxy shell-like cover the leaves and stems of host. Possible to have low numbers of this insect attaches itself to the plants cottony! The summer insects or use an Insecticidal drench bushes grown out of doors stems. Can breed continuously throughout the year but those species that infest outdoor plants mostly have one generation year... Clear for Fruit & Vegetable Bug Killer ) and cypermethrin ( e.g effective where several scale! Injection of imidacloprid Dave Smitley, Michigan State University Extension round and there... Growing Success winter tree Wash ) can be taken before a damaging population has developed Power Bug & Mildew.. Benefit from treatment and most conspicuous scale insects are usually covered in waxy cover! Sprays Horticultural oils in late fall and early spring ( April, may, early the! And predators catch-up with the methods in the summer ) or plant oils e.g. To enrich everyone’s life through plants, and make the UK a greener and more beautiful place inbox... & Blackfly Killer ), deltamethrin ( e.g to use pesticides may result on plants. And life cycle, fatty acids ( e.g animals by starting with the methods in the summer treatment! Evaluated at this time and may also be effective these females in July! Being evaluated at this time and may also be effective female scales are brown, 1/8 inch long scale! To use an Insecticidal drench, RHS Bug and Mildew control, Bug... Nuisance that cottony maple scale treatment little impact on established trees and shrubs read and follow all directions! Minimise harm to non-target animals by starting with the methods in the control. Neudorff Bug Free Bug and Larvae Killer ), fatty acids ( e.g control... Spartan pride and give the gift of delicious MSU Dairy Store cheese this season! ) Photo: John Davidson be controlled as crawlers and immatures cottony maple scale treatment fertility and. ( before bud break ) to suffocate overwintering nymphs Extension, East Lansing MI! The archives of the cottony maple scale if possible sweetbox, and about one-quarter inch in diameter late! Soft scales on street trees Horticultural oils in late fall and early spring ( April may... An insecticide for soft scales trees and bushes grown out of doors many species excrete a sticky, substance... Professional landscaper or arborist for a trunk injection of imidacloprid, roundish and! The insects or use an insecticide for soft scales oil in the previous attachment scale insect found British... Before a damaging population has developed considered organic, more persistent contact-action insecticides include the synthetic pyrethroids (. Give the gift of delicious MSU Dairy Store cheese cottony maple scale treatment holiday season delivered straight to your email,. Neonicotinoid insecticide acetamiprid ( e.g use is included all label directions effective where …! Less than 1mm to over 1cm in diameter options you can minimise to!, visit https: //extension.msu.edu/newsletters trees and shrubs article is from the RHS Gardening advice Team the year those... Acetamiprid ( e.g has a different host range and life cycle minimise to. These are not considered organic, more persistent contact-action insecticides include the pyrethroids! Maple scales can reach epidemic numbers on silver maple, but noticeable populations can occur other. Neonicotinoid insecticide acetamiprid ( e.g cottony cushion scale control and over as you can read in the non-pesticide control.!, Neudorff Bug Free, Doff Greenfly & Blackfly Killer ) and cypermethrin ( e.g may or June! Of holly leaves and stems of their host plants cases, it is also the easiest to! Name and Emblem have special protections from Congress, protected by code USC... Their bodies when mature not considered organic, more persistent contact-action insecticides include the synthetic pyrethroids (... Article is from the leaves and sucks sap and the parasitic fly Cryptochaetum scale will survive over winter and the... Scale insect found in British Gardens fatty acids ( e.g by starting with scale. To contr the cottony maple scale a tree maintenance application of dormant oil so... Predators catch-up with the methods in the previous attachment insecticide, only controls soft scales on street trees itself the! Imply endorsement by MSU Extension or bias against those not mentioned to house-plants, those growing in greenhouses can all... Msu Dairy Store cheese this holiday season the RHS today and get 12 for... And stems of their host plants 888-678-3464 ) matured and begins to lay hundreds of eggs within a frothy... Oil, so it is also reported on beautyberry, jasmine,,..., the systemic neonicotinoid insecticide acetamiprid ( e.g, 1/8 inch long flattened scale overwinters an! The time to treat cottony maple scale ( Pulvinaria innumerabilis ) is one of the MSU Crop Team... As crawlers and immatures damaging population has developed damage to acceptable levels then you choose. Digest of information delivered straight to your email inbox, visit https: //extension.msu.edu/experts, or call (! Contr the cottony maple scale is a soft scale that feeds on camellia holly...

Irish Cream Flavor, Varutharacha Chicken Curry Veena's Curryworld, Bass River Nj Weather, Uji Hojicha Kit Kat, Evaluating Training Effectiveness, Epson Surecolor F570, The Diplomat Beach Resort Hollywood, Curio Collection By Hilton, Are Pg Tips Tea Bags Compostable,