Q: I have what I think is a fungus on the underside of my red maple. Management. The "cotton" is actually waxy threads covering as many as 1,500 eggs. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. Wax Scales (Japanese, Florida, or Indian wax scale) Ceroplastes spp. In spring the female matures and lays eggs. The body is covered with flakes of clear wax. Japanese maple scale (JMS) is a small, oystershell-shaped, armored scale (Figure 1). Cottony Maple Scale. Cottony maple scale is most easily noticed in late spring. By late spring the insect has developed into a mature female and begins laying as many as 1,000 eggs. Maples grow well in areas with full sun to partial shade. In landscape and forested settings, Japanese maple can incur scale insect damage, particularly from cottony maple scale. Other Japanese maple pests are scale, mealybug and mites. Adults emerge and mate as the leaves begin expansion in the spring. Serious outbreaks of the cottony maple scale may last for two to three years, but their numbers become greatly reduced when natural predators, including a number of wasps and fly parasites, are present. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. If the infestation is limited to just a few branches, prune them off. Look for small, white or brown insects clinging to leaf petioles -- the stalks attaching the leaf blades to the stem -- and lining the twigs and stems. They usually are difficult to dislodge. ‘Grandiflora’ blooms. Slip on gardening gloves and pluck off the scales by hand if the infestation is minor. The insect tends to populate the undersides of leaves/needles. The pest is very common in … The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. Eggs hatch in early summer and young scales migrate to the leaves. Young females have a dark stripe down the middle and mottling at the sides. Cottony maple cushion scale belong to the soft bodied type. Look for honeydew and sooty mold. Crawlers settle on… Introduce natural predators to the area around the tree. Scale, mites, and mealybugs all produce this cottony, white fuzzy stuff which you’ll find on your acer leaves, especially younger ones. However, over-fertilization favors scale buildup. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. Scales tend to thrive on stressed plants. Cottony Maple Scale. ‘Grandiflora’ blooms or any time in dormancy. Japanese Maple Pests. You’ll see these females in early summer, followed by scale crawlers hatching in late June or early July and crawling around on the undersides of the leaves. Attractive in any landscape, they are especially suitable for small gardens and can be grown in containers. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. This scale looks like cotton balls attached to the stem. If practical, improve plant sites to reduce stress and promote growth. The insect forms a cottony mass on the lower sides of branches. Magnolia scale is our largest soft scale insect, reaching ½ inch in length. The adult beetle is black with a red spot on each wing. 1 mL/in DBH for trees 2 - 10 in DBH 1.5 mL/in DBH for trees 10 - 36 in DBH 2 mL/in DBH for trees 36 in DBH and above. Well-timed applications can eradicate the scale larvae. During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. Scales can also cause the decline of otherwise healthy trees. List of files and visuals associated with this text. Cottony Maple Scale . Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. , Jim Casey Joins Rainbow as a Territory Manager, SUMMER: 2.5 - 4.0 oz/gal water WINTER: 1 - 2.5 oz/gal water, Spring at 930 GDD or when Hydrangea arb. The developing females and nymphs produce copious amounts of honeydew which can collect on foliage and branches and cause growth of sooty mold. The insect overwinters as a female scale. Check back in a few days, however, to make sure you removed all of the insects. The cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. Soft scales are usually larger, lack the protective cover, but protect themselves with waxy secretions. They are easy to … White egg sacs may be 1/4” to 1/2” in length and are visible in late spring to early summer. Ohio State University Horticulture and Crop Science: Acer palmatum, University of California IPM Online: Maple—Acer spp. The small, brown, 1/8 inch long flattened scale overwinters as an inconspicuous, immature female on the bark of twigs and branches. Scales can also cause the decline of otherwise healthy trees. The major scale insect pests are cottony maple, cottony camellia, oleander, and cottony taxus scale. The beauty and grace of a Japanese maple (Acer palmatum) make it an ideal focal point in formal gardens throughout U.S. Department of Agriculture plant hardiness zones 6 to 8. The leaves look healthy, not dried or curled or brown ... Q. Japanese Maple Problems - There is a white cottony substance on the leaves and branches. Tweet. They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. 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. This scale looks like cotton balls attached to the stem. 2) Cottony camellia scale is also known as Cottony taxus scale The eggs hatch in late June and July and the crawlers move to the leaves. Following a recommended fertility program and watering regime will promote plant health. Cottony taxus scale is most commonly found on yews and hollies in this area. Fortunately, these sap-sucking insects rarely cause serious damage to established, healthy plants. Leaf feeders include the Japanese beetle. Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. 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 scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Aphids; Azalea Lace Bug (Stephanitis pyroides) Azalea Leafminer (Caloptilia azaleella) Cottony Maple Scale; Dogwood Borer (Synanthedon scitula) Eastern Tent Caterpillar (Malacosoma american) Euonymus Scale (Unaspis euonymi) Fall Webworm Commonly occurring host plants of cottony camellia scale inresidential landscapes include camellia, holly, yew, English ivy, rhododendron, hydrangea, mulberry, Japanese maple, sweetbox, euonymous, pittosporum, and jasmine. The cottony maple leaf scale is so named because the females exude their eggs in an elongated, white, cottony structure called an ovisac which are stuck onto the underside of leaves. There are 2 generations a year in Maryland. A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Pest description and damage Mature cottony maple scale are small, flat, oval, brown insects 0.25 to 0.375 inch in diameter. 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). The cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. Cottony maple cushion scale belong to the soft bodied type. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Cottony camellia scales, Pulvinaria floccifera, are cream to tan, elongate oval, and relatively flat. Egg sacs may grow to as large as 1/2 inch in diameter and may contain up to 1000 eggs. COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. 1). Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. Mature females can be found on undersides of leaves near veins, and may reach 5mm in length. Immature females are flat and inconspicuous. These leaf feeders can destroy the looks of a tree in a matter of weeks. They are slightly convex and are brown with a yellow-brown ridge down the back (Figure 1). There are 2 generations a year in Maryland. Large numbers of foraging bees, wasps, hornets, and ants on dense shrubs may indicate wax scale. In spring the female matures and lays eggs. Soft scale produce a sticky substance called honeydew; armored scale do not. Older scales are dark brown. For heavier infestation and/or more resistant insects, use 1.5 mL or 2 mL rates on trees having a DBH >1 in. This scale spends the … Maple scales are small bugs that appear as whitish cotton. This makes the Japanese maple an excellent choice for rural and urban gardeners alike. The females mature when the plant resumes growth in the spring. Scale insects can be controlled using horticultural oil sprays. There are several possible insect problems with Japanese maples. 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. Spray your Japanese maple with insecticidal oil or soap. Japanese maple scale seems to be a growing problem, mostly on the east coast. Branch and twig dieback may occur with heavy infestations. Maples do best in cool climates and are not well adapted to southern or desert climates. Guessing tree is about 15 years old. Mature females look like popcorn strung along the twigs. The eggs hatch in late June and July and the crawlers move to the leaves. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. Japanese maple Early spring – summer, ideally 1-3 weeks before pests are actively feeding, Spring at 930 GDD or when Hydrangea arb. How to Get Rid of Scales on Japanese Maples. Male scales are tiny, winged insects. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. Eggs masses are conspicuously white and cottony in appearance. They require deep, thorough irrigation and a ready moisture supply in the root zone. The major scale insect pests are cottony maple, cottony camellia, oleander, and cottony taxus scale. Cottony camellia scale has been reported on 37 different families of plants. They are unattractive and can damage or even kill young trees, however, so most home gardeners get rid of them. The pest is very common in the tri-city area of Michigan at this time. Ants on Japanese Maple. The scale overwinters as an immature female on the twigs of the host. Verify that it is scale you are dealing with. The cottony maple scale is common on maple, boxelder, hackberry, dogwood, beech, apple, oak, linden, honeylocust, and elm. Japanese maples (Acer palmatum) are desirable for their delicate, colorful leaves and compact size. They are also called cottony taxus scales as this scale is a fairly common pest of yew. List of files and visuals associated with this text. Drop them into a bucket of water to drown them. 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. Q: I have what I think is a fungus on the underside of my red maple. It looks like white puffs of rice with a black spot on one side of the puff. Cottony Maple Scale . Potted Dwarf Japanese Maple - Tips of leaves are turning brown. 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. How do ... Q. These scales also produce large amounts of liquid waste Cottony maple scale is a food source for many predaceous insects and parasites. The major predator of the immature scale is the twice-stabbed lady beetle. The most common Japanese Maple pests are the Japanese beetles. Management. Consequently, they may not be effective where several l… The insect overwinters as a female scale. The females mature when the plant resumes growth in the spring. Cottony Maple Scale. They’re easily confused with mealybugs, as they both produce a white fuzz on the plant. © Copyright 2020 Hearst Communications, Inc. Minor infestations of scale on small trees may be knocked off the tree with a strong stream of water, eliminating the need for chemicals. Japanese Maple Scale. They are slightly convex and are brown with a yellow-brown ridge down the back . The fungus is on almost every leaf. The body enlarges several times greater than the overwintering scale, resembling a kernel of popcorn. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… Cottony Maple Scale. Pulvinaria innumerabilis. Females grow rapidly in spring and produce hundreds of eggs. This type of scale insect is known as an armored scale because the insects protect themselves underneath an armored cover that is usually white in color. 2) Cottony camellia scale is also known as Cottony taxus scale The waxy coating over the body is white, but the female, eggs and crawlers (the immature stage) are lavender (Figures 2 and 3). Its favored host is maple trees, although it has … Some of the leaves look like they are being eaten by the fungus. Severely prune back heavily infested branches and protect new growth with insecticide applications. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. 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 outbreaks often subside in … Cottony maple scales can reach epidemic numbers on silver maple, but noticeable populations can occur on other species of soft maple. Cottony maple scale is a food source for many predaceous insects and parasites. Although generally hardy, Japanese maples can suffer from a number of insect pest infestations, including infestations by both soft and armored scales. Cottony Maple Scale Adult females are about 3/16 inch long. Scales are most commonly found Each mass usually contains 1,000-1,500 eggs. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. Cottony maple scale can produce large amounts of honeydew which leads to sooty mold. The body is covered with flakes of clear wax. By The Old House Web. Repeat applications may be necessary. 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. Q. Japanese Maple Losing Healthy Leaves - The top ends of my Japanese maple are falling off. The cottony maple scale is most easily recognized by the characteristic egg masses on twigs and branches. Leaf feeders include the Japanese beetle. Wax scales feed on many shrubs and trees, but Japanese holly, Chinese holly, euonymus, boxwood, firethorn, spirea, barberry, and flowering quince are preferred. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Family Aceraceae, University of California IPM Online: Scales. Honeydew on Japanese maple The majority of acer bugs leave behind sooty substances called honeydew on plants. Cottony maple scale outbreaks often subside in … Look on twigs and small branches for all wax scale stages. By The Old House Web. Maple leaf and flowers. Japanese maples (Acer palmatum) are desirable for their delicate, colorful leaves and compact size. Some of the leaves look like they are being eaten by the fungus. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. Tweet. However, scales have no segmented heads or bodies, so they look like tiny circular pests that move around. It looks like white puffs of rice with a black spot on one side of the puff. They are black, flat, and oval. Its favored host is maple trees, although it has … Severely infested trees may have deformed and wilting leaves. The fungus is on almost every leaf. 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. Sticky honeydew, which is secreted from the insects, may be on the leaves, trunk and even on the ground around the tree. A favored host is silver maple, but it will attack other species of maple as well. Cottony cushion scale, Icerya purchasi, can infest a number of woody ornamentals and certain crops ().Common hosts in California are citrus, cocculus, nandina, and pittosporum. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. 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