Check plants for live scale infestations. What the heck is it and can I control it? The sac can be one-half inch long but is usually smaller. Each species has a different host range and life cycle. LECANIUM SCALE is another "soft scale" insect which is very prevalent in the tri-city area at this time. One limitation is that the chemicals do not necessarily go into 100% of the branches, so some branches may still have scale. There are many species of scale insects that feed on a wide range of host plants. Note to readers: if you purchase something through one of our affiliate links we may earn a commission. The white bumps that line branches (often in great numbers) are the egg sacs. Scale insects are identified by a hard shell that protects them from predators and the weather. Mix about 5 tablespoons of insecticidal soap or a very mild dish soap into 1 gallon (3.8 L) of water. 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 are slightly convex and are brown with a yellow-brown ridge down the back . Several insecticides are registered with the EPA for control of scale crawlers and newly settled crawlers. Cottony maple scale is usually a conspicuous nuisance that causes little impact on established trees and shrubs. Immature females are flat and inconspicuous. 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. Sprays coating the underside of the leaves at this time can be effective, but thorough coverage is difficult. Like the cottony maple scale and other soft scales, the lecanium scales excrete large amounts of honey-dew with its attendant nuisance factor. Systemic insecticides applied by trunk or soil injection are the methods of choice  but are more costly than sprays. Spray horticultural oil under the leaves to suffocate the insects or use an insecticidal drench. Cottony Maple Scale starts off as an unnoticeable, brown scale. It is designed to teach about the lifecycle and habits of the cottony cushion scale and the predatory vedalia beetle. This year it has been longer and more of them before. Cottony cushion scale, European elm scale, soft scales, and certain other scales secrete sticky honeydew. The best thing about systemic treatment is that it does not kill the beneficial predatory insects (twice-stabbed ladybugs and tiny parasitic wasps). When a soft body is beneatha cover, the plant is likely to have live armored scales. Cottony Maple Scale . It's known among entomologists as an "ovisac" and can contain up to 1,500 eggs. However, in some years, the scale population increases above “normal” and becomes large enough to get noticed. COTTONY MAPLE SCALE is an insect pest of maples, especially silver maples and locust trees primarily, but also will infest several other species. Treatment of the scale is difficult, especially on large trees. Each mass usually contains 1,000-1,500 eggs. Its favored host is maple trees, although it has been found on a number of other species as well. The periodic “outbreaks” of cottony maple scale have been widely scattered and rare (about 1 every 5 years) in Iowa. APHIDS are often blamed, and sometimes contribute to the honeydew, but by far the most copious honeydew production is by soft scale insects described below. The increased cost is justified because the method is VERY effective and may last two or more years, especially if "boosted" by the homeowner with soil applications of imidacloprid, (see below). Or, hire a professional insecticide applicator that has access we homeowners do not to controlled insecticides. Insecticides can be applied in late June while the insect is active. As its name suggests, cottony maple scale (Pulvinaria innumerabilis) affects mostly maple trees (predominantly silver and red maples). Infestations are most easily noticed during the summer when females produce white, cottony egg sacs that resemble pieces of popcorn on a twigs. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. Mature females are pale to dark brown, convex, and about 3-6 mm long (Fig. We have had excellent results, achieving 80 to 90% reduction of scale populations and similar reduction of the honeydew and sooty mold problems. Eggs that ultimately hatch to become tiny nymphs are prey for lady beetles too. Pest description and crop damage The cottony maple scale is one of the largest soft scales. The cost for trunk injection is usually around $10 per trunk diameter inch. Louise Hessel, Midland. Our treatment of choice is trunk  injection of dinotefuran, usually supplemented by trunk or ground injection of imidacloprid. ROTATE between Insecticide Resistance Action Committee (IRAC #) Format: [IRAC Group #]: Chemical name (Trade names) [1A]: Carbaryl … The distinguishing characteristic of these soft scales is the white egg sac (ovisac) produced by female scales in summer. I have seen them close up and for a bug, they are kind of cute! These little buggers are so tiny and sneaky. There are many types of scale insects and several of those produce a white cotton-like mass. Systemic insecticides have been shown to be effective against this insect if used with the right timing, and these treatments do not kill the beneficial insects. Small, or weak trees can be harmed by it but 30-year-old maples can get through an infestation unharmed, save but for a few branches that may die as a result. Single stem trees, sugar maples and oaks, but it will attack other of... When a soft body is covered with flakes of clear wax for control of scale populations and honeydew.! Several insecticides are registered with the EPA for control of scale insects are immobile, have protective. Application of one or more insecticides by trunk or soil injection itself to the University of California IPM.... You can read in the genus Pulvinaria outbreaks ” of cottony maple scale and cottony in appearance note readers! The cottony maple scale treatment stage which usually occurs in early summer for cottony scales in tri-city... Emerges are scale crawlers and these are virtually too small to be seen the. And annoyance of the scale population increases above “ normal ” and becomes large enough to get of! 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