The insect tends to populate the undersides of leaves/needles. Introduce natural predators to the area around the tree. 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. This scale looks like cotton balls attached to the stem. The cottony maple scale is common on maple, boxelder, hackberry, dogwood, beech, apple, oak, linden, honeylocust, and elm. Large numbers of foraging bees, wasps, hornets, and ants on dense shrubs may indicate wax scale. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. List of files and visuals associated with this text. They are unattractive and can damage or even kill young trees, however, so most home gardeners get rid of them. Eggs masses are conspicuously white and cottony in appearance. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. There are 2 generations a year in Maryland. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. The cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. The major scale insect pests are cottony maple, cottony camellia, oleander, and cottony taxus scale. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. Q. Japanese Maple Losing Healthy Leaves - The top ends of my Japanese maple are falling off. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Cottony maple cushion scale belong to the soft bodied type. Cottony taxus scale is most commonly found on yews and hollies in this area. Cottony Maple Scale. The fungus is on almost every leaf. They are slightly convex and are brown with a yellow-brown ridge down the back (Figure 1). Male scales are tiny, winged insects. Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. Consequently, they may not be effective where several l… A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. Egg sacs may grow to as large as 1/2 inch in diameter and may contain up to 1000 eggs. Leaf feeders include the Japanese beetle. Older scales are dark brown. This makes the Japanese maple an excellent choice for rural and urban gardeners alike. © 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. 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 outbreaks often subside in … Cottony Maple Scale. The waxy coating over the body is white, but the female, eggs and crawlers (the immature stage) are lavender (Figures 2 and 3). They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. Maple leaf and flowers. The body is covered with flakes of clear wax. The pest is very common in the tri-city area of Michigan at this time. 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. Sticky honeydew, which is secreted from the insects, may be on the leaves, trunk and even on the ground around the tree. The insect forms a cottony mass on the lower sides of branches. Some of the leaves look like they are being eaten by the fungus. The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. Ladybugs and parasitic wasps are highly effective, natural ways to get rid of scale, according to the University of California IPM Online. Soft scale produce a sticky substance called honeydew; armored scale do not. Its favored host is maple trees, although it has … However, scales have no segmented heads or bodies, so they look like tiny circular pests that move around. They are slightly convex and are brown with a yellow-brown ridge down the back . Management. 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. 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. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… In spring the female matures and lays eggs. 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. There are 2 generations a year in Maryland. Other Japanese maple pests are scale, mealybug and mites. Ants on Japanese Maple. Fortunately, these sap-sucking insects rarely cause serious damage to established, healthy plants. If the infestation is limited to just a few branches, prune them off. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. Wax scales feed on many shrubs and trees, but Japanese holly, Chinese holly, euonymus, boxwood, firethorn, spirea, barberry, and flowering quince are preferred. Although generally hardy, Japanese maples can suffer from a number of insect pest infestations, including infestations by both soft and armored scales. , 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 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. Its favored host is maple trees, although it has … Tweet. Check back in a few days, however, to make sure you removed all of the insects. They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. 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