Two generations are commonly produced per year. Fortunately, these pests are often kept under control by a wide range of natural enemies. Japanese Maple Scale (Lopholeucaspis japonica (Cockerell)), Family Diaspididae 1). Adult males are on host plants from late April to late May. Cottony maple Occasionally, large populations of scale can devitalize plants and retard growth, as well as discolor foliage and underlying woody tissues. Use left and right arrow keys to navigate between menus and submenus. It is caused by dry w… Signs/Damage: Scales feed on plant juices by piercing and sucking plant leaves, stems and fruits. Cottony Females without egg sacs are 1/8 inch (2-3 mm) long, flat, pale to dark brown and soft. Is Insecticidal Soap Concentrate safe to use on Japanese Red Maples? Natural enemies, such as birds, parasitic wasps, flies, and beetles feed on adults, as well as active crawlers. Males molt into a prepupa for a week and then emerge as winged adults. Leaf Scorch: On maple (Acerspecies) trees a number of problems cause symptoms that are generally classified as leaf scorch. On small trees, pick off female The white, oystershell-shaped scale can completely cover needles causing plant discoloration, needle yellowing, and even branch death. Q&A related to Scale Insects. They also do not kill predators. Whenthe bump itself can be squashed it is likely to be some othertype of scale. Explore this online platform for Chicago-area residents to share their favorite stories about trees. Observations made on this pest in Pennsylvania indicate that it produces one generation each year. After mating, the females lay eggs under their protective shell. Our trees. If you're seeing small white or brown scale-like dots on tree trunks or branches, it could be scale. The amber to reddish-brown nymph overwinters on a branch. several years. Cottony maple scale (Pulvinaria innumerabilis) is a flattened brown scale about 1/8” long that becomes one of the most conspicuous soft scale insects attacking ornamental plants when mature females begin to secrete white, waxy, cottony-appearing egg sacs in early summer. There are more than 25 species of scale insect found in British Gardens. Silver m aple leaves may turn yellow and fall prematurely, and branch dieback from cottony maple scale is possible on stressed or weakened trees. Once they start feeding, they quickly begin to produce the hard protective covering as they grow. Unlike soft-scale insects, JMS does not feed on the phloem (plant vascular tissue). Mature scale insects rarely move once they settle into a spot. Use pesticides safely and wisely; read and follow label directions. begins on the tree provide excellent control of over-wintering nymphs. Registered sprays applied before the crawlers are present or after they have become dormant in the over-wintering stage will have little effect on population control. The oystershell scale adult armor is light to dark brown and shaped like a tiny oystershell. The female deposits her eggs beneath herself on a twig of the host plant. hatch in early July. As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). Cottony maple scale is associated with silver maple but may occur on other deciduous trees and shrubs. any serious action in your landscape, check Once the female has laid her eggs, her body dries and turns brown, serving as a scale cover to protect the eggs that have been placed beneath it. Crawler emergence occurs in the fall. Spruce bud scale / Mid-to-late July. Scale insects are very vulnerable in the crawler stage when the young are looking for a place to feed. insecticide in early July to early August may help Host plants include ash, dogwood, lilac, maple, and willow. Scorch symptoms tell us that one or more of the following factors are affecting the tree: 1. Each species has a different host range and life cycle. reduce next year's infestation. In the fall, the crawlers return to a limb or trunk crevice where they hibernate as nymphs (immature females). At maturity, a single female can produce 500-600 eggs in May, which hatch in late June or early July. However, at maturity, scale insects are immobile, have no visible legs or antennae, and in the case of armored scales, are covered with a protective shell that ranges from about 1/16-to-3/8-inches in size. Cottony maple scale is a soft scale that infest maples, boxelder, basswood, birch, elm, and linden trees. At maturity, the females produce the white, cottony egg masses, called ovisacs, over a period of several weeks. Scale insects are invasive and will infest other plants, so move infested plants away from healthy ones. Excessive amounts of honeydew can attract black sooty mold fungus. It is merely a sign that insects are active on the plant. This post is on the Japanese Maple Scale. In their juvenile growth stage, they are referred to as "crawlers". Armored scales secrete a protective cover over their bodies and usually overwinter as eggs beneath the female cover. Cottony maple scale is always present in Iowa but in most years is too low in abundance to attract attention. Hosts: Maples (especially silver), honeylocust, linden and other hardwoods. Key Points. The life history of this scale insect is not well known in the United States. As crawlers, they are highly mobile, six-legged, have no protective cover, and are usually smaller than a pinhead. Check plants for live scale infestations. appropriate, localized recommendations. Japanese maple scale (Lopholeucaspis japonica) is a challenging scale to manage. Use up and down arrow keys to explore within a submenu. This species overwinters as a small immature form … Japanese maple scale (JMS) is a small, oystershell-shaped, armored scale (Figure 1). or the honeydew is causing serious problems beneath the tree, a chemical Inspect the branches for scale insects. Verify that it is scale you are dealing with. Immature females are flat and inconspicuous. Problems cause symptoms that are generally classified as leaf scorch as it grows into an adult brownish-purple in color continue! But need to be some othertype of scale insects can be blown to other parts of the best-known this... Crawler stage when the young are looking for a scale bug infestation recommendations! Mouth parts into the tissue beneath the major veins crawlers '' hatch spring... 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maple scale insects

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