Immature females are flat and inconspicuous. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. Cottony maple scale occurs most commonly on silver maple, but it can also feed on other maple species, boxelder, basswood, birch, elm, and linden. Crawlers hatch through June and remain on the undersides of the leaves through winter. Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. These cottony masses can contains hundreds of eggs each. Cottony maple scale over-winters as immature females (nymphs) on twigs and branches. It is designed to teach about the lifecycle and habits of the cottony cushion scale and the predatory vedalia beetle. A close examination of the ovisacs reveals the eggs are held inside a sack-like matrix of sticky, silk-like material. The body is covered with flakes of clear wax. Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. Cottony maple scales commonly infest silver maple but can feed on several species including other maples, boxelder, basswood, birch, elm, and linden. Severely prune back heavily infested branches and protect new growth with insecticide applications. Cottony maple scale usually does not cause serious injury to other trees. A favored host is silver maple, but it will attack other species of maple as well. 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. Although a heavy infestation may cause some thinning of the canopy, it rarely results in tree death. The insect spends winter in an immature stage on twigs and branches, maturing in late May or early June. And they will ruin your citrus, unless you get it under control. 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. Pulvinaria innumerabilis (cottony maple scale) is a small, flattened, brown scale insect about 1/8" long. 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 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. In early summer mature females begin to secrete white, waxy, cottony-appearing egg sacs in which they lay as many as 1,500 eggs. 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. Leaves may turn yellow and drop prematurely. The eggs hatch in June and July. REC, Western Maryland Heavy infestations of this scale may cause yellowing, wilting and eventually branch dieback. The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. Cottony Scales include Cottony Camellia Scale (Hollies and verious other plants), Cottony Taxus Scale (Yews), Cottony Maple Scales (Silver Maple, Dogwood and others) and Azalea Bark Scale (Azalea, Andromeda and Rhododendron). To monitor for this pest, look for tiny (1/8 inch long), oystershell shaped, and brown to gray scale covers on the bark of wilting or dead branches. Hosts: Maples (especially silver), honeylocust, linden and other hardwoods. The pest is very common in … The tree may become weak if the infestation is severe and repeats for several years. The pest is very common in the tri-city area of Michigan at this time. Control measures must be timed to coincide with hatching of the crawler stage which usually occurs in early summer for cottony scales. Eggs masses are conspicuously white and cottony in appearance. This is best applied when the scale are in their younger nymph stages, so make sure to regularly check your landscape for pests. Consequently, they may not be effective where several l… They secrete the white, cottony masses beneath which, they lay 500 or more eggs in late May to early June. These cottony masses can contains hundreds of eggs each. REC, Lower Eastern Shore Honeydew is the sugary, liquid waste excreted by scale insects. It is also known to be able to survive on honey and black locust, white ash, Euonymus, oak, boxelder, dogwood, hackberry, sycamore, beech, elm, willow, basswood, and poplar. During the summer, the scale enlarges by secreting wax resulting in a body several times greater than the overwintering form. Cottony Maple Scale (Pulvinaria innumerabilis) is a soft scale insect pest that commonly attacks maple trees, but can be found on a variety on hosts.Usually it is just a nuisance, but in very severe infestations, it can kill weakened trees or branches on otherwise healthy trees. Timing pesticide application to the crawler stage is very important. For cottony cushion scale, there are some control options. Egg sacs of cottony maple scale. Cottony Cushion Scale had taken over, right under my nose! Print a PDF of this page: Cottony maple scale. However, in large numbers they can cause premature leaf drop and twig dieback. The white cottony egg masses, which resemble popcorn, are the most distinguishing feature of this scale. By late spring the insect has developed into a mature female and begins laying as many as 1,000 eggs. They are firmly attached to the twigs and branches of various trees and may be ¼ to ⅜ inch in diameter. 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. but have a strong preference for Silver Maple. Second, the scale is obvious and distinctive (a rare combination when talking about insect pests). During the growing season use horticultural oil or insecticidal soap to conserve beneficials. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Pulvinaria innumerabilisThe cottony maple scale (Pulvinaria innumerabilis) is one of the largest and most conspicuous scale insects in this country. In extreme conditions, a tree may be killed. 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. with its southern boundary being at or slightly north of I-72. First, the cottony maple scale prefers maples, particularly silver maple, but may occur on almost any hardwood tree or shrub. 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. Mature female scales are brown, roundish, and about one-quarter inch in diameter. Adult females are about 1/8 inch long, oval and yellowish tan with a brown margin. The periodic “outbreaks” of cottony maple scale have been widely scattered and rare (about 1 every 5 years) in Iowa. Cottony maple scale crawlers along leaf veins in the summer. Severely infested trees look like they are covered with strings of popcorn. 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