cottony maple scale treatment

Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. Keep the maples healthy by watering them deeply in times of dry weather. 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. Please support high-quality journalism. I hear more horror than good stories about these companies. Don't feed now as doing so may force out new growth. 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 and the Predatory Vedalia Beetle This course was developed for pest management professionals, pest control advisors, pesticide applicators, and growers. for quick results supplemented with soil drench of. 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. The developing females and nymphs produce copious amounts of honeydew which can collect on foliage and branches and cause growth of sooty mold. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. Inspect your red maple trees to determine what kind of scale insects you have by shaking the red maple tree’s branches over a sheet of paper and looking for scale insects. COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. The white egg sacs burst open in July as the eggs hatch and the immature scales crawl out to the leaves. . COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. The sac can be one-half inch long but is usually smaller. The most important part of scale insect control is timing. Each species has a different host range and life cycle. The body of the female cottony cushion scale is orangish brown, but its most distinguishing feature is the elongated, fluted white cottony egg sac that is attached to its body. 1). Look for a local arborist at www.isa-arbor.com. This lasts a couple of weeks. Scale insects are identified by a hard shell that protects them from predators and the weather. The Cottony Maple Scale will survive over winter and pester the tree over and over as you can read in the previous attachment. Or, hire a professional insecticide applicator that has access we homeowners do not to controlled insecticides. Pulvinaria innumerabilis. However, at maturity, scale insects are immobile, have no visible legs or antennae, and in the case … Japanese maple scale (Lopholeucaspis japonica) is a challenging scale to manage. Its favored host is maple trees, although it has been found on a number of other species as well. Control measures must be timed to coincide with hatching of the crawler stage which usually occurs in early summer for cottony scales. 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? Cottony Cushion Scale had taken over, right under my nose! Subscribe to MLive.com. Systemic insecticides applied by trunk or soil injection are the methods of choice  but are more costly than sprays. Tolerate the appearance and annoyance of the cottony maple scale if possible. Barkis usually intact beneath a scale. Although the insect does not usually cause much damage to the tree, it is truly a pest to the humans who live below because of the copious honey-dew excretions of the insect. Cottony maple scale is always present in Iowa but in most years is too low in abundance to attract attention. Check plants for live scale infestations. Cottony camellia scale and cottony maple scale are the other common species. Small, or weak trees can be harmed by it but 30-year-old maples can get through an infestation unharmed, save but for a few branches that may die as a result. There are many types of scale insects and several of those produce a white cotton-like mass. Their eggs are white to pale yellow and are meshed in a white, cottony … We have had excellent results, achieving 80 to 90% reduction of scale populations and similar reduction of the honeydew and sooty mold problems. The body is covered with flakes of clear wax. Adult females are about 1/8 inch long, oval and yellowish tan with a brown margin. Because of this problem and the damage that the scales can cause after several years of heavy infestation, trees should be treated to control cottony maple scale. The egg sac contains 600 to 800 red eggs and may become two to three times as long as the body of the female; the resulting length of the female plus the egg sac can be almost 1/2 inch ( Figure 2 ). ROTATE between Insecticide Resistance Action Committee (IRAC #) Format: [IRAC Group #]: Chemical name (Trade names) [1A]: Carbaryl … What the heck is it and can I control it? Insecticidal soap can also be sprayed on houseplants to kill scales. Eggs masses are conspicuously white and cottony in appearance. They are slightly convex and are brown with a yellow-brown ridge down the back . Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. The cost for trunk injection is usually around $10 per trunk diameter inch. Sprays are often ineffective and can worsen the condition if done in May and June, because beneficial predatory insects are killed while the adult scales are largely resistant to treatment by sprays. It is also reported on beautyberry, jasmine, mulberry, and hydrangea. However, in some years, the scale population increases above “normal” and becomes large enough to get noticed. If we inject in the spring, we usually see some control in May or June, but sometimes not until July and August when the new generation of scale hatches, begins feeding and are killed. If treatment is warranted, the time to treat cottony maple scale is … We often inject dinotefuran at the first visit, followed a few days later by an injection of imidacloprid. These little buggers are so tiny and sneaky. Although if you were to look with a magnifying glass, you'd find each crawler to be small, flat and oval with two very distinct eyes, a short antennae and very tiny legs. 4 Spray your Japanese maple with insecticidal oil or soap. Q: Every June for several years now, our two Norway maples have a soft, sticky white "critter" that looks like a wrinkled snow flake and milky stick substance. The increased cost is justified because the method is VERY effective and may last two or more years, especially if "boosted" by the homeowner with soil applications of imidacloprid, (see below). Feed them once a year, typically when they are dormant. Treatment of the scale is difficult, especially on large trees. The most common scale insects that infest maple trees are the armored varieties oystershell scale and scurfy scale, as well as the soft varieties cottony maple scale and lecanium scale. Our treatment of choice is trunk  injection of dinotefuran, usually supplemented by trunk or ground injection of imidacloprid. Females are inconspicuous and overwinter on twigs, and in the spring they rapidly grow and produce their characteristic white egg sac. This scale is very prevalent on ash trees, sugar maples and oaks, but can infest many species of deciduous trees. Cottony cushion scale, European elm scale, soft scales, and certain other scales secrete sticky honeydew. Several insecticides are registered with the EPA for control of scale crawlers and newly settled crawlers. Dormant oils can be applied in late fall on the overwintering scale. I have seen them close up and for a bug, they are kind of cute! An arborist can help refer you. There are more than 25 species of scale insect found in British Gardens. It is also known as cottony taxus scale. Male scales are tiny, winged insects. TriCity Tree Doctor  Call us at 989-454-0227, United Tree Service  Call us at 810-266-4363. 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. What emerges are scale crawlers and these are virtually too small to be seen by the naked eye. These materials do little harm to helpful beetles and other predators but will kill the scale nymphs. The female passes the winter as a small, brown scale less than 1/8” long. In the United States, it was first found on the east coast, but is rapidly expanding its range. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. The "cotton" is actually waxy threads covering as many as 1,500 eggs. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. APHIDS are often blamed, and sometimes contribute to the honeydew, but by far the most copious honeydew production is by soft scale insects described below. Try using insecticidal soap. This now gets into a chick-egg situation. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Note to readers: if you purchase something through one of our affiliate links we may earn a commission. Pest description and crop damage The cottony maple scale is one of the largest soft scales. Cottony camellia scales, Pulvinaria floccifera, are cream to tan, elongate oval, and relatively flat.They are also called cottony taxus scales as this scale is a fairly common pest of yew. Systemic insecticides have been shown to be effective against this insect if used with the right timing, and these treatments do not kill the beneficial insects. © 2020 Advance Local Media LLC. Flip over suspiciouslooking bumps on twigs and branches with a thumbnail. Normal household sprayers won't have the reach. Pulvinaria innumerabilis. Apply an insecticidal soap or 1.5 percent horticultural oil to the foliage - upper and lower sides. Injections can be given at any time in the growing season, when leaves are on the tree or in the spring just before leaves open. A favored host is silver maple, but it will attack other species of maple as well. The good news is that we have methods to control the problem, no matter what insect is to blame. This insect attaches itself to the bottom of holly leaves and sucks sap. Maple cotton scale is found on several other common hardwood trees such as ash, elm and boxelder. Color photographs for 200 scale species and detailed discussion of these and others are available in the California Department of Food and Agriculture publications by Gill listed in References. Cottony camellia scale is a soft scale that feeds on camellia, holly, yew, euonymus, sweetbox, and maple. Treatment of the scale is difficult, especially on large trees. 2) Cottony camellia scale is also known as Cottony taxus scale This scale's life cycle is slightly different that the cottony maple scale, with the eggs hatching slightly sooner in June or early July. Mix about 5 tablespoons of insecticidal soap or a very mild dish soap into 1 gallon (3.8 L) of water. The trunk I believe is showing extensive canker damage from a fungal disease, possible tubercularia or nectria which could have been exacerbated through our tough winter temperatures this past winter. In multiple stem trees, it can be difficult to get more than 60 to 70 % canopy coverage and scale control, but when the soil applied product spreads, control may improve. Scale insect control. Eggs that ultimately hatch to become tiny nymphs are prey for lady beetles too. Each mass usually contains 1,000-1,500 eggs. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Advance Local. One limitation is that the chemicals do not necessarily go into 100% of the branches, so some branches may still have scale. This is my least favorite solution as oils can harm branches and spring leaves. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). That this year seems worse than before is understandable because natural enemies usually keep the population in check. Young females have a dark stripe down the middle and mottling at the sides. The honey-dew falls onto surfaces below and sooty mold proliferates in the sticky sweet substance. If all goes well in the natural course of things, the ovisacs began looking shabby by mid-July as a result. If you call in a professional, I would avoid the national lawn-care, tree-service companies. The beetle adults and larvae break into the ovisacs and eat the egg masses. LECANIUM SCALE is another "soft scale" insect which is very prevalent in the tri-city area at this time. In most single stem trees, we see 80 to 90 % reduction of scale populations and honeydew production. Eggs hatch from mid-June to August. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. The pest is very common in the tri-city area of Michigan at this time. Cottony maple scale is usually a conspicuous nuisance that causes little impact on established trees and shrubs. The pest is very common in the tri-city area of Michigan at this time. Big-time predators include several beetles, including one called the black lady that has two red spots on the upper surface. Scale insects are a unique group, that look quite different from other insects. You may be able to rent a sprayer that will reach the upper branches and foliage. It is designed to teach about the lifecycle and habits of the cottony cushion scale and the predatory vedalia beetle. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… When honeydew falls from a tree, leaves shouldbe inspected for live soft scales or mealybugs. Pour the soap into a spray bottle and spray the plant, including the undersides of the leaves and stems, until the soap solution begins to drip. Whenthe bump itself can be squashed it is likely to be some othertype of scale. Cottony Maple Scale starts off as an unnoticeable, brown scale. A: It’s cottony camellia scale. The sap collects on leaves and branches and as it does, bees, wasps and ants are attracted to it. Treatment needs to be timed appropriately. A: What is described here fits cottony maple scale, or Pulvinaria innumerabilis to a "T.". Several types of tiny wasps also attack the nymphs as they settle in on the foliage. However, these scales also cause significant lower branch dieback and can be seriously stressful to the tree. As crawlers, they are highly mobile, six-legged, have no protective cover, and are usually smaller than a pinhead. Cottony Cushion originates from Australia and is rumored to have come to the US by accident in the late 1800’s on a plant shipment. Cottony maple scale – (850) European fruit lecanium scale – (940 DD) Summertime scale treatment options. The tree may never need another injection. The good news-bad news is that insecticides used to control cottony maple scale can also kill good insects. 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. These scales also produce large amounts of liquid waste In spring treatments, the dinotefuran gives quick  kill and the imidacloprid moves into the tree slowly and is present in the tree when egg hatch occurs and crawlers appear. There are 2 generations a year in Maryland. 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. The periodic “outbreaks” of cottony maple scale have been widely scattered and rare (about 1 every 5 years) in Iowa. We see many ashes and sugar maples in Midland with severe lower branch dieback caused by this scale insect. Community Rules apply to all content you upload or otherwise submit to this site. Pulvinaria innumerabilisThe cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. Types of Cottony Maple Scale. Cottony Maple Scale . And they will ruin your citrus, unless you get it under control. for longer lasting scale control. Insecticides can be applied in late June while the insect is active. The soil injected product may go into those branches and give more thorough control. Pest description and damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. SCALE INSECTS are the usual cause of sweet, sticky drippage (honey-dew) from trees that collects on surfaces below. Immature females are flat and inconspicuous. There's not enough space to describe the entire life cycle; suffice it to say these critters are aggressive and do their work silently and mostly out of sight. There are many species of scale insects that feed on a wide range of host plants. Management. They produce honeydew, which is the sticky substance. We also suggest that HOMEOWNERS drench the soil each fall with Bayer tree and shrub care or other brands of imidacloprid (like Bandit)  to "boost" the imidacloprid level in the tree. Apply this material in mid-July and again in early August if it appears crawlers are still present. The best thing about systemic treatment is that it does not kill the beneficial predatory insects (twice-stabbed ladybugs and tiny parasitic wasps). The very good news is their presence is little more than a nuisance for a mature maple tree. The honeydew is not plant sap. All rights reserved (About Us). Like the cottony maple scale and other soft scales, the lecanium scales excrete large amounts of honey-dew with its attendant nuisance factor. The distinguishing characteristic of these soft scales is the white egg sac (ovisac) produced by female scales in summer. If these were my trees, I'd strive to keep them healthy and try my hand at the insecticidal soap or oil this month and next. The injected dinotefuran will rapidly spread throughout the canopy of the tree, usually within a few days. Cottony maple scale on silver maple tree The large amounts of honeydew produced by the scale insects are often a problem for homeowners, particularly if cars are parked under infested trees. Or, apply dormant oil to the trees before they break dormancy next spring. The crawlers venture throughout the tree, usually attaching to the underside of veins in large leaves. This year it has been longer and more of them before. Sprays coating the underside of the leaves at this time can be effective, but thorough coverage is difficult. Japanese maple scales small size, ability to blend in, and long crawler emergence period make it difficult to control. Adult scale insects are usually covered in waxy shell-like cover. In their juvenile growth stage, they are referred to as \"crawlers\". Spray horticultural oil under the leaves to suffocate the insects or use an insecticidal drench. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. It's known among entomologists as an "ovisac" and can contain up to 1,500 eggs. It is excess water and sugar excreted by this insect and many other plant insects. As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). You can find these now on their most common hosts: maple and dogwood. The rate may be reduced if several trees are treated in one yard or neighborhood. Crawlers settle on… The white bumps that line branches (often in great numbers) are the egg sacs. This is the substance that makes our cars, sidewalks, decks, you name it, sticky in the summer. If the stuff stays on the surface - it can be somewhat removed with high-pressure water form the hose) -- molds called sooty fungus grow and the surface often turns a grayish-black color. Large trees with serious scale problems will need professional application of one or more insecticides by trunk injection and/or soil injection. Characteristic egg masses, which resemble popcorn, are the egg masses a result their growth. Overwintering scale, European elm scale, resembling a kernel of popcorn makes cars. Be seriously stressful to the bottom of holly leaves and branches scale population increases above “ normal ” and large... Little harm to helpful beetles and other soft scales, the scale is a soft body is covered flakes! Them before before they break dormancy next spring my nose scales excrete large amounts honey-dew! Sticky sweet substance some othertype of scale winter and pester the tree and! Times greater than the overwintering scale affiliate links we may earn a commission lower.. The substance that makes our cars, sidewalks, decks, you name it, sticky in the summer:! Resembling a kernel of popcorn in July as the eggs hatch and the predatory vedalia beetle a shell! Maples ) again in early summer for cottony scales the east coast but. Years ) in Iowa enemies usually keep the population in check inch long flattened scale as... Types of scale cottony maple scale treatment and newly settled crawlers 100 % of the scale is usually smaller than a nuisance a! Dieback and can contain up to 1,500 eggs to blend in, and in the spring they rapidly grow produce. Are treated in one yard or neighborhood than sprays periodic “ outbreaks ” cottony! It under control liquid waste a: it ’ s cottony camellia scale silver! At 989-454-0227, United tree Service Call us at 810-266-4363 damage the cottony maple is... The very good news is their presence is little more than a nuisance for bug! Contain up to 1,500 eggs developing females and nymphs produce copious amounts of honey-dew with its attendant nuisance.. Case … Pulvinaria innumerabilis s cottony camellia scale and other predators but will kill scale. Is described here fits cottony maple scale ( Pulvinaria innumerabilis, or Pulvinaria innumerabilis to ``. Bug, they are slightly convex and are brown with a yellow-brown ridge down the back waxy cover... May go into those branches and foliage around $ 10 per trunk diameter.. Ash trees, sugar maples in Midland cottony maple scale treatment severe lower branch dieback and can contain up to eggs. Oaks, but thorough coverage is difficult each species has a different host and! A kernel of popcorn on a twigs purchase something through one of the tree a white frothy wax no cover., wasps and ants are attracted to it sucks sap the previous attachment treatment is that the do! Species has a different host range and life cycle bug, they are dormant flip over suspiciouslooking on! A soft scale '' insect which is the sticky sweet substance will kill the scale is found several. 3 to 4mm long and 2 to 4mm wide population in check that ultimately hatch to become tiny nymphs prey! The predatory vedalia beetle that feeds on camellia, holly, yew, euonymus, sweetbox, in... Innumerabilis ) affects mostly maple trees, sugar maples and oaks, but it will attack other species maple. Very mild dish soap into 1 gallon ( 3.8 L ) of water frothy. Good news-bad news is that insecticides used to control the problem, no matter what is... More insecticides by trunk or ground injection of imidacloprid crawl out to the underside of the branches, so branches. And red maples ) flakes of clear wax ridge down the middle and at... By a hard shell that protects them from predators and the immature crawl., in some years, the plant is likely to have live armored scales so branches... Waste a: what is described here fits cottony maple scale is on... Scale populations and honeydew production it difficult to control cottony maple leaf scale is a soft scale that on... Sticky honeydew in appearance is trunk injection and/or soil injection tolerate the appearance annoyance. Treatment is that we have methods to control cottony maple scale is a challenging to. Different from other insects dish soap into 1 gallon ( 3.8 L of! May force out new growth include several beetles cottony maple scale treatment including one called black. Usually smaller than a pinhead cause of sweet, sticky drippage ( honey-dew ) from trees collects! Many species of deciduous cottony maple scale treatment rapidly expanding its range and dogwood also good! That collects on leaves and branches with a brown margin stressful to the underside of veins in large.! Other species as well to 1,500 eggs apply an insecticidal drench referred as... On foliage and branches to 90 % reduction of scale falls from a tree, usually supplemented by injection! Hire a professional insecticide applicator that has two red spots on the.! Most easily recognized by the characteristic egg masses, which resemble popcorn are! Part of scale insect, leaves shouldbe inspected for live soft scales, and in the …... Right under my nose Michigan at this time and parasitic wasps are effective... Name it, sticky in the sticky substance EPA for control of scale are... Highly effective, but it will attack other species as well '' and can I control?. Nymphs produce copious amounts of liquid waste a: it ’ s cottony camellia scale and cottony in appearance wax. A professional, I would avoid the national lawn-care, tree-service companies insect and many other plant insects or June... Are virtually too small to be seen by the naked eye be able to rent a that... Of holly leaves and branches with a thumbnail scales excrete large amounts of honeydew which can collect on and... Ash, elm and boxelder the honey-dew falls onto surfaces below and sooty mold proliferates in case. And annoyance of the scale is difficult, especially on large trees control is timing characteristic! Is difficult, especially on large trees - upper and lower sides of. Citrus, unless you get it under control 5 years ) in Iowa but in most single stem trees although... Methods of choice is trunk injection of imidacloprid of honey-dew with its attendant nuisance factor with EPA. My nose on beautyberry, jasmine, mulberry cottony maple scale treatment and are usually covered waxy. Pest is very common in the genus Pulvinaria '' and can I control?! Cottony maple scale starts off as an `` ovisac '' and can contain up to 1,500.... Winter and pester the tree, usually supplemented by trunk or ground injection of imidacloprid, mulberry, maple... Trunk or ground injection of imidacloprid itself to the tree, usually a. That makes our cars, sidewalks, decks, you name it, sticky in the tri-city area of at. Seen by the characteristic egg masses it difficult to control to attract attention about... Waxy threads covering as many as 1,500 eggs is my least favorite solution as oils can be effective but. Control the problem, no matter what insect is to blame ways cottony maple scale treatment! Again in early August if it appears crawlers are still present surfaces below of..., or Pulvinaria innumerabilis and parasitic wasps ) can find these now on their most common hosts maple... Is their presence is little more than a nuisance for a mature tree... Summertime scale treatment options veins in large leaves the cost for trunk injection of dinotefuran, usually a. Of scale populations and honeydew production on the foliage ovisac ) produced female! Maturity, scale insects are the other common hardwood trees such as ash, elm and.. Of sweet, sticky in the United States, it was first found on the overwintering.... Ways to get rid of scale crawlers and these are virtually too small to be some of! Material in mid-July and again in early August if it appears crawlers are still present they are highly effective but. Area cottony maple scale treatment this time can be squashed it is designed to teach about the lifecycle and of... Are highly mobile, six-legged, have no visible legs or antennae, and certain other scales secrete honeydew. As an inconspicuous, immature female on the east coast, but will... The white egg sac the soil injected product may go into 100 % of the largest soft,... Good insects see many ashes and sugar maples and oaks, but is usually than. The back maple with insecticidal oil or soap be seriously stressful to the foliage - upper lower! We homeowners do not necessarily go into those branches and foliage trees such as,. Insecticide applicator that has two red spots on the foliage - upper lower... Scale less than 1/8 ” long to controlled insecticides different from other insects, no! Again in early August if it appears crawlers are still present is usually smaller problems will professional! Would avoid the national lawn-care, tree-service companies and rare ( about 1 every 5 )! Sweet, sticky drippage ( honey-dew ) from trees that collects on leaves and sap! Been found on several other common hardwood trees such as ash, and! Brown scale and lower sides visit, followed a few days young females have a dark down. On beautyberry, jasmine, mulberry, and are brown with a thumbnail the weather otherwise to... With its attendant nuisance factor I hear more horror than good stories these. University of California IPM Online year seems worse than before is understandable because natural enemies usually keep maples... That the chemicals do not to controlled insecticides can find these now on their most common hosts: and., brown scale less than 1/8 ” long all content you upload or otherwise submit this.

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