Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. may not work as well on the next generation of young scales that will be . The best time to treat heavy attacks is when the more vulnerable nymphs are present, for many scales out of doors this is during mid-late summer. You’ll see these females in early They are members of the “true bug” insect family, along with bed bugs. per inch of trunk circumference, and then poured around the base of the If treatment is warranted, the time Tolerate the appearance and annoyance of the cottony maple scale if possible. treatment with kerosene emulsion for the cottony maple scale in parks of Chicago, and no doubt thousands of the minute chalcids were killed, as they were found quite plentifully on unsprayed trees. The adults are sedentary but newly-hatched nymphs crawl actively over the plant surface and spread the infestation. This can be colonised by a black non-parasitic fungus known as sooty mould, Some scale insects deposit their eggs under a covering of white waxy fibres in early summer, Where possible tolerate populations of scale insects. This insect attaches itself to the bottom of holly leaves and sucks sap. 4 Spray your Japanese maple with insecticidal oil … mid-June. They lay There are 2 generations a year in Maryland. Many species excrete a sticky, sugary substance, honeydew. This information is for educational purposes only. Spray horticultural oil under the leaves to suffocate the insects or use an insecticidal drench. Basal drenches can be made any time from late May to early professional landscaper or arborist for a trunk injection treatment. By late May or early June the female scale has matured and begins to lay hundreds of eggs within a white frothy wax. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Summary: Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time.Cottony scale insects produce a cottony egg mass from which the mobile crawler stage hatches. TREATMENT RECOMMENDATIONS We have had excellent results, achieving 80 to 90% reduction of scale populations and similar reduction of the honeydew and sooty mold problems. Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! MSU is an affirmative-action, equal-opportunity employer. Scales tend to thrive on stressed plants. When trees have a trunk diameter greater than 12 inches (greater Each mass usually contains 1,000-1,500 eggs. Ecofective Bug Control, RHS Bug and Mildew Control, SB Plant Invigorator and Westland Resolva Natural Power Bug & Mildew). It is also known as cottony taxus scale. Dormant oil treatment - A heavy horticultural oil is sprayed on all tree surfaces to smother and kill overwintering female scales before they can finish their development. Adult scale insects are usually covered in waxy shell-like cover. If practical, improve plant sites to reduce stress and promote growth. Dave Smitley, Michigan State University, Department of Entomology - Cottony maple leaf scale females are 3 to 4mm long and 2 to 4mm wide. It is also reported on beautyberry, jasmine, mulberry, and hydrangea. the sticky mess from dripping honeydew. Spring (April, May, early June) Soil injection - A systemic insecticide is injected into the soil around an infested tree. Scale insects on indoor plants can breed all year round and so there is no best time of year to treat. Each species has a different host range and life cycle. Other systemic insecticides like dinotefuron and clothianidin are being evaluated at this time and may also be effective. Scale insects can be found on a wide range of ornamental plants, fruit trees and bushes grown out of doors. Small, newly transplanted, high value specimen trees may benefit from treatment. drenches are made. This product is mixed in a bucket of water at the rate of 1 oz For large trees, it is best to contact a calico scale outbreaks are severe and seem to persist many years, and in developing in July and August. Following a recommended fertility program and watering regime will promote plant health. In parasites and predators catch-up with the scale. On yew, it is also known as the cottony yew scale. If there are lots of scale in one spot, they secrete enough honeydew to cover nearby leaves with “syrup” on which black mold will grow. Not all scale insects affect the growth of plants and so they do not necessarily require control, Adult scales and egg masses can be removed when seen but this may not reduce large populations, For scales on deciduous plants including edible fruits, a plant oil winter wash (considered organic e.g. Some species also produce white, waxy egg masses on stems or the undersides of leaves, this can be mistaken for mealybug or woolly aphid. Our treatment of choice is trunk injection of dinotefuran, usually supplemented by trunk or ground injection of imidacloprid. They look like tiny The best time to deal with scale insects is when the more vulnerable crawlers are newly hatched, which, for cushion scale, is late June to July. It is also known to be able to survive on other deciduous trees and shrubs including honey and black locust, white ash, euonymus, oak, boxelder, dogwood, hackberry, sycamore, linden, beech, elm, willow, basswood, poplar, rose and sumac. Several species of scale insects are confined to house-plants, those growing in greenhouses or other sheltered places. Py Bug Killer), The systemic neonicotinoid insecticide acetamiprid (e.g. Other systemic insecticides like dinotefuron and Although imidacloprid has scale insects listed on the label, it doesn’t kill cottony cushion scale. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. 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. Scale insects on bay. Common name Cushion scale Scientific name Pulvinaria floccifera Plants affected Camellia, Ilex (holly), Euonymus japonicus, Rhododendron, Trachelospermum, Taxus (yew) and some other evergreen shrubs Main symptoms Black sooty mould on the upper leaf surface in winter-spring; scale insects and white egg masses on the underside of leaves in spring and summer These pesticides have a very short persistence and so may require reapplication to keep scale numbers in check. Severely prune back heavily infested branches and protect new growth with insecticide applications. They suck sap from the leaves and stems of their host plants. Solabiol Bug Free, Doff Greenfly & Blackfly Killer) or plant oils (e.g. 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. trunk. Natural enemies are the best way to control Cottony Cushion Scale: the Vedaila Beetle and the parasitic fly Cryptochaetum. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. .• Insecticidal Sprays Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. It is possible to have low numbers of this insect for years without an outbreak. They are mostly 1-6mm (less than ¼in) long, although wisteria scale, Eulecanium excrescens, can be up to 10mm (about ½in), and vary in shape and colour. Cottony maple scale crawlers along leaf veins in the summer. The Royal Horticultural Society is the UK’s leading gardening charity. The eggs hatch into pale yellow-green crawlers in late June or July and migrat… The outbreak should subside in a year or two when The best time to treat most scale insects is after eggs hatch when the crawlers are first active and are searching for feeding sites, but before they begin producing their shells. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. But if they are not in your garden, then try my method: isopropyl alcohol, also known as rubbing alcohol Horticultural oil can also be applied to manage the crawler stage and is least disruptive of natural enemies or bees. Homeowners also have the option of using imidacloprid products that can They feed by sucking sap and some can weaken host plants, many excrete a sticky substance (honeydew), which allows the growth of sooty moulds. The scale is called maple cotton scale, Pulvinaria innumerabilis whereas cottony cushion scale is Icerya purchasi, which I am sure clears that up completely for you doesn’t it? 1). May 21, 2010. 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