The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. Horticultural oil can be used in winter when trees are without leaves to smother females living on branches. Only one generation of cottony maple scale occurs each year. Mature cottony maple scales are small, flat, oval, brown insects without obvious legs, antennae or wings. Cottony maple scale is a food source for many predaceous insects and parasites. After leaves open thorough coverage is very difficult. Cottony maple scale is a food source for many predaceous insects and parasites. Immature females are flat and inconspicuous. Therefore, systemic provide much longer control than contact insecticides and can kill all feeding stages. Indians. The 1/4-inch white cottony ovisac, or egg sac, is deposited on bark. The eggs hatch in late June and July and the crawlers move to the leaves. N.C. In April, male scales develop into tiny, winged, gnatlike insects which mate with females and then die. The Soft Scales (Homoptera : Coccoidea : Coccidae), The soft scale insects of Florida (Homoptera: Coccoidea: Coccidae), Soft Scale Identification and Management on Ornamental Plants, NC State Extension Plant Pathology Publications and Factsheets, NC State Horticultural Science Publications, Entomology – Insect Biology and Management, NC Cottony ovisac on maple leaf with desiccated adult female present. Severely infested trees look like they are covered with strings of popcorn. Revised: Sept. 18, 2019. commitment to diversity. Cottony maple scale crawlers along leaf veins in the summer. Adult females are about 3/16 inch long. Consequently infested trees are stunted and appear scorched and black. Its favored host is maple trees, although it has been found on a number of other species as well. Eggs masses are conspicuously white and cottony in appearance. Spray when the temperature will stay above freezing for 24 hours after the spray. commitment to diversity. See the North Carolina Agricultural Chemicals Manual for additional insecticide choices. The biggest problem is the honeydew dripping down on decks, picnic tables, lawn chairs and parked cars. They closely adhere to the undersides of leaves and are easily overlooked. (76) Photo: John Davidson be controlled as crawlers and immatures. This insect is active throughout the United States and attacks many shade trees and shrubs, but it is primarily found on soft Maples and Lindens. The scale itself is about 1/4 inch, and the egg sack is about 1/2 inch in size. A&T State University. Drench applications should be made when eggs are present so the tree can take up the material by the time crawlers become active. Nymphs are brown-translucent, 1/5 inch; females lay eggs in the white marshmallow egg-sac along the twigs and small branches; Young insects remove sap from leaves creating a speckled appearance and possibly yellowing leaves in mid to late summer Cottony Scale insects produce cottony egg masses from which young crawlers emerge. The cause of this annoyance is a tiny insect known as Cottony Maple Scale. Crawlers are extremely small and appear as yellow-orange moving dots. Cottony maple scale reaches epidemic numbers on silver maple, but noticeable populations can occur on red maple. Adults were present in mid-May; I photographed one in my backyard in central Illinois at that time. When we do see it, however, the show is spectacular. They become active and feed on the leaves between June and July. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. If abundant, a sooty mold fungus may colonize the honeydew, resulting in a black sooty appearance on the leaves, twigs, and branches. For assistance with a specific problem, contact your local Cooperative Extension center. Twig dieback may occur resulting in sparsely foliated canopy (Figure 2). Read our During June, the inconspicuous female scales that spent the winter on the stems expand and begin producing a large, white, cottony egg sac. These eggs hatch from mid-June to August, and the young nymphs called scale crawlers emerge… This publication printed on: Dec. 26, 2020, The Scale Insects of California: Part 1. In spring the female matures and lays eggs. It is also known as cottony taxus scale. Inappropriate timing is not only ineffective, but Cottony Maple Scale. These little buggers are so tiny and sneaky. 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 … In extreme conditions, a tree may be killed. It has also been reported from some western states. Recommendations of specific chemicals are based upon information on the manufacturer's label and performance in a limited number of trials. Honeydew is the sugary, liquid waste excreted by scale insects. 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. This is the substance that makes our cars, sidewalks, decks, you name it, sticky in the summer. Consequently, they may not be effective where several l… They are also called cottony taxus scales as this scale is a fairly common pest of yew. Do not use acephate on red or sugar maple. The body is covered with flakes of clear wax. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status. Infestations of this magnitude can occur on silver maple but are less likely to occur on other hosts. Imidacloprid, a systemic insecticide, only controls soft scales. Dormant-oil treatments control overwintering female nymphs on most hosts (except sugar and Japanese maple) after leaf drop in the fall and before budbreak in the spring. Egg sacks appear as white cottony masses emerging from beneath the brownish scale covers of females. Its cottony egg sac and profuse honeydew production make cottony cushion scale easy to spot in the landscape. Leaves may turn yellow and drop prematurely. Sooty mold is commonly found growing on the honeydew in mid- to late summer. Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. 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). The presence of this Insect le easily discovered during the summer months because of the white cottony masses about the size of peaa that are found on the lower sides of the limbs, especially those near the ground. Receive Email Notifications for New Publications. Following a recommended fertility program and watering regime will promote plant health. Adult twice-stabbed lady beetles are about 1/8 inch long, roundish, and black, with two red spots on the back. Find more information at the following NC State Extension websites: Publication date: Aug. 1, 2010 Mature female scales are brown, roundish, and about one-quarter inch in diameter. COTTONY MAPLE SCALE Lee Townsend, Extension Entomologist A mature female cottony maple scale is 1/8" long, and has a brown, flat, oval body. They spend the winter in an immature stage on twigs or branches and complete development in June when the egg sacs appear. Figure 2. Severely prune back heavily infested branches and protect new growth with insecticide applications. Cottony maple scale Pulvinaria innumerabilis. They are firmly attached to the twigs and branches of various trees and may be ¼ to ⅜ inch in diameter. In the spring, a white egg sac is developed and holds many crawlers (insect). Cottony maple scale outbreaks often subside in two to three years, due to control by natural enemies. Dave Smitley, Michigan State University, Department of Entomology - May 21, 2010. This is the optimum time for control. The scale overwinters as an immature female on the twigs of the host. Many systemic products are available that can be applied as foliar spray or drench. The twice-stabbed ladybeetle, which feeds on soft-bodied insects, is commonly found dining on cottony maple scale crawlers. The crawler's waste is called honeydew. Cottony maple scale definition is - a brown oval soft scale (Pulvinaria innumerabilis) that in summer becomes covered with a white cottony secretion beneath which its eggs are laid, that is widespread in North America, and that attacks and often kills various native and cultivated trees and shrubs. The body is covered with flakes of clear wax. Adults are usually present in July when the crawlers are present. — Read our It also is known to survive on other species of maple, honey and black locust, white ash, euonymus, oak, boxelder, dogwood, hackberry, sycamore, beech, elm, willow, basswood, and poplar. Cottony Maple Scale. In some cases, the scales are quite numerous. As the scale eggs hatch, the lady beetles leave, apparently to look for other prey. Foliar applications should target crawlers. 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