Lumps, bumps and weird cottony fluff on your plants are more than just some strange coincidence, they’re probably soft scale insects! The developing females and nymphs produce copious amounts of honeydew which can collect on foliage and branches and cause growth of sooty mold. Maple cotton scale is found on several other common hardwood trees such as ash, elm and boxelder. Severely infested trees look like they are covered with strings of popcorn. Whenthe bump itself can be squashed it is likely to be some othertype of scale. Do not exceed 0.47 lb ai/a per year. University of Kentucky College of Agriculture . The crawlers insert their mouthparts and begin to suck sap from the leaves. Relative Disease Susceptibility and Sensitivity to Sulfur, Diagnosis and Control of Phytophthora Diseases, APHIS List of Regulated Hosts and Plants Proven or Associated with Phytophthora ramorum, Plants Resistant or Susceptible to Armillaria Root Rot, Verticillium Wilt in the Pacific Northwest, Plants Resistant or Susceptible to Verticillium Wilt, Plants Susceptible to Sclerotinia sclerotiorum, Potential Impact of Cyanobacteria on Crop Plants, Management of the Cyanobacterium Nostoc in Horticultural Nurseries, Impatiens Necrotic Spot: New Name, Same Threat, Virus Certification Program for Fruit and Ornamental Trees, Care and Maintenance of Wood Shingle and Shake Roofs, Winter Injury of Landscape Plants in the Pacific Northwest, Recognizing Sapsucker Damage on your Trees, Key to Nutrient Deficiencies in Vegetable Crops, Key to Nutrient Deficiencies of Deciduous Fruit and Nuts, Use of Disinfestants to Control Plant Pathogens, Current Status of Biological Weed Control Agents in Idaho, Oregon, and Washington, Biological Control Agents and Their Roles, Restricted-use Herbicides in Idaho, Oregon, and Washington, Testing for and Deactivating Herbicide Residues, Herbicide Effectiveness on Weeds in Grass Seed Crops, Dry Bean East of the Cascades - Phaseolus spp. Cottony maple scale is a lecanium-type scale, being very similar in appearance to European fruit lecanium for most of the year. Cottony taxus scale on yew. Cottony maple scale, adult females with egg sacs on twigs. However, if scale populations are heavy, they can cause some dieback of twigs and branches and sometimes premature leaf drop. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. Imidacloprid, a systemic insecticide, only controls soft scales. Pest description and crop damage The cottony maple scale is one of the largest soft scales. This scale looks like cotton balls attached to the stem. But then… nothing. 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. ma-turity is the most conspicuous scale insect indigenous to the United States, and has received much attention from entomologists and hor-ticulturists on account of its occasional abundance. Both scales produce white, cottony ovisacs, and both have wide host ranges; however, as its common name implies, cottony maple leaf scale produces its ovisacs on the underside of its host's leaves. Check plants for live scale infestations. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. Lecanium scales • Parthenolecanium spp. PHI 0 days. Life cycle cottony maple scale. Although a heavy infestation may cause some thinning of the canopy, it rarely results in tree death. 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. During this time, ¼ inch long white ovisacs may be found on branches and twigs. © 2012 - CNRTL 44, avenue de la Libération BP 30687 54063 Nancy Cedex - France Tél. Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. The cottony maple scale outbreak described in last weeks newsletter seems to be very limited in distribution. The insect overwinters as a female scale. (76) Photo: John Davidson be controlled as crawlers and immatures. 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. PHI varies by label. The biggest problem is the honeydew dripping down on decks, picnic tables, lawn chairs and parked cars. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. Cottony Maple Scale List of files and visuals associated with this text. During the summer, the scale enlarges During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. In spring the female matures and lays eggs. Make cover spray applications when scale crawlers first emerge. This scale feeds primarily on maple and dogwood in North Carolina, but it also infests hollies, Andromeda, and gum. Cottony Maple Scale Management. Don’t worry, we have the answers to your burning soft scale questions. Also toxic to fish and other aquatic invertebrates. Cottony maple scale occurs most commonly on silver maple, but it can also feed on other maple species, boxelder, basswood, birch, elm, and linden. The cottony maple scale is easiest to find in May and June. The eggs hatch in late June and July and the crawlers move to the leaves. They look like cottony cushion scale but I have never heard of it on maple. Initially a pest of citrus in California cottony cushion scale is now a pest of many crops including ornamentals throughout the southern US. Lecanium scale, calico scale and cottony maple scale are covering branches of silver maple, honeylocust and many other species of hardwood trees in southeast Michigan, the Saginaw Valley region, and a few other parts of the Cottony maple scale occurs most commonly on silver maple, but is also common on other maples including box elder. Ovisacs are white, cottony masses that contain eggs. They spend the winter as mated females on twigs and branches. Crawlers hatch between mid-June and July and can continue even into August. The Cottony Maple Scale will survive over winter and pester the tree over and over as you can read in the previous attachment. Not one little blossom for a year and a half. Retrouvez The Cottony Maple Scale in Illinois (Classic Reprint) et des millions de livres en stock sur Amazon.fr. This scale looks like cotton balls attached to the stem. (field bean, kidney, lima, navy, and pinto), Garbanzo Bean (Chickpea), Cicer arietinum, Control of Some Common Aquatic Weeds with Herbicides, Treated Water Use Restrictions (Number of Days), Effectiveness of Major Forestry-registered Herbicides during Seasons of Optimum Usage, Oregon Basis, Recommendations for Broadcast Spraying for Control of Listed Species, Recommendations for Directed Spot Spray, Tree Injection, and Basal Bark Treatment, Hybrid Cottonwood (Hybrid Poplar) Grown for Pulp, Vegetation Management in Orchards, Vineyards, and Berries, Blueberry, Gooseberry, Currant, and Elderberry, Important Preharvest Intervals (PHIs) for Vegetables, Site Preparation, Stale Seedbeds, and Burndown Applications, Registered Uses of Carfentrazone (Aim) Herbicide in Food Crops, Crop Rotation Intervals (months) for Common Soil-active Herbicides, Herbicide Effectiveness in Christmas Trees, Weed Control in Container-grown Nursery Stock, Weed Control in Field-grown Nursery Stock, Ornamental Bulb, Rhizome, Corm, and Tuber Crops, Established Tree, Shrub, Rose, and Ground Cover Landscapes, General Maintenance around Ornamental Plantings, Susceptibility of Broadleaf Weeds in Turf to Common Herbicides, Weed Treatments and Available Products for Home Gardens and Landscapes, Managing Unwanted Vegetation in Riparian Restoration Sites, What to Do in Case of Pesticide Poisoning, Personal Protective Equipment (PPE) Definitions, Cleaning, Recycling, and Disposing of Agricultural Pesticide Containers, Disposing of Unusable Pesticides and Agricultural, Household and Residential Pesticide Products, Pesticides, Endangered Species, and Mandatory No-spray Buffer Zones, Worker Protection Standard (WPS) for Agricultural Pesticides, Andromeda (Pieris japonica)-Azalea and rhododendron lace bug, Andromeda (Pieris japonica)-Azalea bark scale, Apricot, flowering (Prunus)-Peach twig borer, Apricot, flowering (Prunus)-Peachtree borer, Apricot, flowering (Prunus)-Western tiger swallowtail, Aspen (Populus tremuloides)-Aspen blotchminer, Aspen (Populus tremuloides)-Oystershell scale, Aspen (Populus tremuloides)-Poplar twiggall fly, Azalea (Rhododendron)-Azalea and rhododendron lace bug, Azalea (Rhododendron)-Oblique-banded leafroller, Bamboo (Bambusa and others)-Bamboo spider mite, Birch (Betula)-Apple-and-thorn skeletonizer, Boxelder (Acer negundo)-Western boxelder bug, California lilac (Ceanothus)-Ceanothus leafminer, Camellia (Camellia)-Cottony camellia scale, Cherry, flowering (Prunus)-Apple-and-thorn skeletonizer, Cherry, flowering (Prunus)-Cherry bark tortrix, Cherry, flowering (Prunus)-Oblique-banded leafroller, Cherry, flowering (Prunus)-Peachtree borer, Cherry, flowering (Prunus)-Pear sawfly (pear slug), Cherry, flowering (Prunus)-Redhumped caterpillar, Cherry, flowering (Prunus)-Rose leafhopper, Cherry, flowering (Prunus)-San Jose scale, Cherry, flowering (Prunus)-Shothole borer, Cherry, flowering (Prunus)-Tent caterpillar, Cherry, flowering (Prunus)-Western tiger swallowtail, Cotoneaster (Cotoneaster)-Cotoneaster webworm, Crabapple, flowering (Malus)-Apple-and-thorn skeletonizer, Crabapple, flowering (Malus)-Cherry bark tortrix, Crabapple, flowering (Malus)-Fall webworm, Crabapple, flowering (Malus)-Oystershell scale, Crabapple, flowering (Malus)-Rose leafhopper, Dahlia (Dahlia)-Western spotted cucumber beetle, Douglas-fir (Pseudotsuga)-Brown soft scale, Douglas-fir (Pseudotsuga)-Cooley spruce gall adelgid, Douglas-fir (Pseudotsuga)-Douglas-fir needle midge, Douglas-fir (Pseudotsuga)-Douglas-fir tussock moth, Douglas-fir (Pseudotsuga)-Douglas-fir twig weevil, Douglas-fir (Pseudotsuga)-Pine needle scale, Douglas-fir (Pseudotsuga)-Silver-spotted tiger moth, Douglas-fir (Pseudotsuga)-Spruce spider mite, Elm (Ulmus)-Spiny elm caterpillar (mourning cloak butterfly), Euonymus (Euonymus)-Cottony camellia scale, Firethorn (Pyracantha)-Azalea and rhododendron lace bug, Firethorn (Pyracantha)-Cherry bark tortrix, Geranium (Pelargonium)-Leafroller and leaftier, Hawthorn (Crataegus)-Apple-and-thorn skeletonizer, Hawthorn (Crataegus)-Leafroller and leaftier, Hawthorn (Crataegus)-Pear sawfly (pear slug), Honeylocust (Gleditsia triacanthos)-Honeylocust plant bug, Honeylocust (Gleditsia triacanthos)-Honeylocust pod gall midge, Kinnikinnick (Arctostaphylos)-Root weevil, Laurel, Portuguese (Prunus)-Carnation tortrix, Laurel, Portuguese (Prunus)-Peachtree borer, Maple (Acer)-Maple tip moth (Maple shoot borer or Maple twig borer), Mountain ash (Sorbus)-Apple-and-thorn skeletonizer, Mountain ash (Sorbus)-Cherry bark tortrix, Mountain ash (Sorbus)-Mountain ash sawfly, Mountain ash (Sorbus)-Pear sawfly (pear slug), Peach, flowering (Prunus)-Cherry bark tortrix, Peach, flowering (Prunus)-Peach silver mite, Peach, flowering (Prunus)-Peach twig borer, Peach, flowering (Prunus)-Peachtree borer, Pear, flowering (Pyrus)-Apple-and-thorn skeletonizer, Pear, flowering (Pyrus)-Cherry bark tortrix, Pear, flowering (Pyrus)-Oystershell scale, Pear, flowering (Pyrus)-Pear leaf blister mite, Pear, flowering (Pyrus)-Pear sawfly (pear slug), Plum, flowering (Prunus)-Cherry bark tortrix, Plum, flowering (Prunus)-Peach twig borer, Plum, flowering (Prunus)-Pear sawfly (pear slug), Plum, flowering (Prunus)-Tent caterpillar, Quince, flowering (Cydonia)-Cherry bark tortrix, Rhododendron (Rhododendron)-Azalea and rhododendron lace bug, Rhododendron (Rhododendron)-Azalea bark scale, Rhododendron (Rhododendron)-Carnation tortrix, Rhododendron (Rhododendron)-Cottony cushion scale, Rhododendron (Rhododendron)-Lecanium scale, Rhododendron (Rhododendron)-Rhododendron lace bug, Rhododendron (Rhododendron)-Rhododendron whitefly, Rose (Rosa)-Western spotted cucumber beetle, Spruce (Picea)-Cooley spruce gall adelgid, Willow (Salix)-Spiny elm caterpillar (mourning cloak butterfly). Initially a pest of citrus in California cottony cushion scale is now a pest of many crops including ornamentals throughout the southern US. Cottony camellia scale is a soft scale that feeds on camellia, holly, yew, euonymus, sweetbox, and maple. Pulvinaria innumerabilis. For biology, life history, monitoring and management, How to Reduce Bee Poisoning from Pesticides, Alfalfa Leafcutting Bee (Megachile rotunda) Pests, Horticultural, Landscape, and Ornamental Crops, Field Characteristics of Fruit-Tree-Attacking Spider Mites in the Pacific Northwest, Pests of Cabbage and Mustard Grown for Seed, Pests of Rutabaga and Turnip Grown for Seed, Biology and Control of the Garden Symphylan, Bean, Dry Cultivar Resistance to Bean Common Mosaic, Grape (Vitis spp.) As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). They look like tiny army helmets or turtle shells on the branches. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. Cottony Maple Scale has one generation per year, and understanding its life cycle is crucial for management of this pest, because not all pesticides will be effective at all insect life stages. Large amounts of honeydew, on which sooty mold will readily grow, is produced and can be a fruit contaminant. Biology and life history This insect prefers to feed on maples, but will infest a wide array of trees, shrubs, tree fruits and berries. Flip over suspiciouslooking bumps on twigs and branches with a thumbnail. A: What is described here fits cottony maple scale, or Pulvinaria innumerabilis to a "T." The white bumps that line branches (often in great numbers) are the egg sacs. However, infestations on newly transplanted trees in the landscape can cause premature leaf drop, stunted growth, and, in some cases, branch or tree death. As crawlers, they are highly mobile, six-legged, have no protective cover, and are usually smaller than a pinhead. Pieces … As temperatures increase in the spring, the female starts to grow again. Alias: Cottony maple scale.This is the most unbuglike insect you ever will come across. Apply at either dormant, delayed-dormant, or as an in-season cover spray. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. : +33 3 83 96 21 76 - Fax : +33 3 83 97 24 56 They are slightly convex and are brown with a yellow-brown ridge down the back . Mature females are easily recognizable by the distinctive cottony white sac that contains about 1,000 eggs. There are many species of scale insects that feed on a wide range of host plants. At dormant or delayed-dormant, use with a horticultural oil. In spring, when depositing eggs, scales on twigs resemble strings of popcorn. Immature females are flat and inconspicuous. In extreme cases, it is possible to lose the tree. Also black sooty mold. They resume feeding in the spring and produce the large cottony egg sac. Mature female scales are brown, roundish, and about one-quarter inch in diameter. Quite often it is mistaken as some sort of fungus or scab that grows on the side of a plant. insecticidal soap (M-Pede and other brands)-Consult label for rate and use directions. Another is to apply a crawler spray after the cottony maple scale crawlers hatch about mid-July. Egg sacs may grow to as large as … The body is covered with flakes of clear wax. How … This insect occurs in the northern half of Illinois, as far south as Danville and Lincoln. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. Relative Disease Susceptibility and Sensitivity to Sulfur, Diagnosis and Control of Phytophthora Diseases, APHIS List of Regulated Hosts and Plants Proven or Associated with Phytophthora ramorum, Plants Resistant or Susceptible to Armillaria Root Rot, Verticillium Wilt in the Pacific Northwest, Plants Resistant or Susceptible to Verticillium Wilt, Plants Susceptible to Sclerotinia sclerotiorum, Potential Impact of Cyanobacteria on Crop Plants, Management of the Cyanobacterium Nostoc in Horticultural Nurseries, Impatiens Necrotic Spot: New Name, Same Threat, Virus Certification Program for Fruit and Ornamental Trees, Care and Maintenance of Wood Shingle and Shake Roofs, Winter Injury of Landscape Plants in the Pacific Northwest, Recognizing Sapsucker Damage on your Trees, Key to Nutrient Deficiencies in Vegetable Crops, Key to Nutrient Deficiencies of Deciduous Fruit and Nuts, Use of Disinfestants to Control Plant Pathogens, Current Status of Biological Weed Control Agents in Idaho, Oregon, and Washington, Biological Control Agents and Their Roles, Restricted-use Herbicides in Idaho, Oregon, and Washington, Testing for and Deactivating Herbicide Residues, Herbicide Effectiveness on Weeds in Grass Seed Crops, Dry Bean East of the Cascades - Phaseolus spp. A favored host is silver maple, but it will attack other species maple. 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