This water soluble insecticide is taken up by the roots and transported throughout the plant where it is ingested by sap feeding insects. The CSU Extension Office says Memorial Day is often the approximate time when eggs hatch in most years. The crawlers are vulnerable to a number of pesticides but adult oystershell scales are protected by their waxy scales which repel water. This is a critical event because the mobile crawlers are susceptible to a number of control options that are not effective against other scale developmental stages. I order from you from time to time. Depending on how many trees you need to treat you should be able to find an economically sized product. The overwintered eggs of Oystershell Scale (Lepidosaphes ulmi) are hatching in Ohio with first instar nymphs (crawlers) afoot in the southwest and northwest parts of the state. Dean Following a recommended fertility program and watering regime will promote plant health. There is one generation each year. The new scale larvae are called crawlers. Management 3) Oystershell scale, Lepidosaphes ulmi Has a large host range. Scale insects are very unusual little critters, classified in the order Hemiptera, which also includes insects such as aphids, leafhoppers, and cicadas. If practical, improve plant sites to reduce stress and promote growth. To control scale insects effectively and to limit damage, Horticultural Oil Insect Spray should be sprayed on the tree in late winter and again before spring bud break begins. ENTFACT-433: Oystershell Scale | Download PDF. Oystershell scale has a wide host range, including ash, birch, dogwood, elm, hemlock, maple, poplar, privet, walnut, and willow. Treat the Scale Infestation. Digital Media Library, Images: University of Kentucky Entomology, College of Agriculture, Food and Environment. Horticultural oils can also be combined with crawler treatments. However, over-fertilization favors scale buildup. There are two races of oystershell scale--brown and gray banded. Oystershell scale Oystershell scale. Insecticides are often applied during this crawler stage for control, but hard scales … Oystershell scale is pretty common on aspen in Wyoming. Insects in this group all have sucking mouthparts. Horticultural oils kill by suffocation or after penetrating over-wintering stages of the insect. Monitor fruit throughout the season and at harvest for scale. Oystershell scale found in our area is either the gray race or the brown race. It has the appearance of small clusters of oyster-shaped “shells” that cover bark on shrubs and trees. Pesticide recommendations in this publication are registered for use in Kentucky, USA ONLY! Management 4) White prunicola scale, Pseudaulacaspis prunicola Generally, pesticides used in commercial orchards prevent the build-up of this pest. If this pest is not controlled early, leaves on affected twigs or branches drop and dieback occurs, both of leaves and twigs/branches. Discover. Scale insects can be attacked by a variety of lady beetles, predatory mites, and small parasitic wasps. I’m Bob from Colorado. Interest waived if repaid in 180 days. * 6-Month Same-As-Cash Loans provided by EnerBank USA, Member FDIC, (1245 Brickyard Rd., Suite 600, Salt Lake City, UT 84106) on approved credit, for a limited time. The Horticultural oil serves to suffocate the scale and eggs. The insecticide must be applied before the tiny insects develop their protective, waxy coverings. Oystershell Scale. Nonchemical Control Numerous natural enemies have been recorded associated with oystershell scale, but none are commercially available. Oils and soaps are safe to use and are especially good choices for sensitive areas, such as where people are present soon after treatment. Because of their short residual, they help to conserve beneficial species. Lexington, KY 40546-0091 Horticultural oil or insecticide application can also give good control if timed properly. June 27, 2011 By Tech Support 4 Comments. You can conserve natural enemies by using insecticidal soaps and oils which have limited impact on beneficial species in comparison to other control alternatives. Buds should break a little earlier than when the plant was infested and expanded leaves should have normal color and turgor. Males and females are about 1/10" inch long and resemble oyster shells. In the spring, horticultural oils can be sprayed by a professional to smother the insects. Oystershell scale is an introduced pest in Calgary. The best way to control oystershell scale is to apply an insecticide when the crawlers are present. Host plants include ash, dogwood, lilac, maple, and willow. Live scales should produce a liquid when mashed, dead scales will be dry and not "bleed" when crushed. Highly refined supreme, superior, or summer oils can be used on many trees and shrubs during the growing season. There are over 8,000 species of scale insects, but oystershell scale is … Understanding the lifecycle of insects is the first step to control. Oystershell scale is an introduced pest in Calgary. When this scale insect was first described in Europe in 1758, it was referred to as the mussel scale. Oystershell Scale ID. This suffocates the insects. This is the only time in the life-cycle of scale that the insect moves. Damage caused by oystershell scale. Oystershell scales are difficult to target with insecticides, as they spend almost 75% of their lives as eggs protected by the scale. Of course, ALWAYS READ AND FOLLOW LABEL DIRECTIONS FOR SAFE USE OF ANY PESTICIDE! Oystershell eggs typically hatch in late May or early June and the active ‘crawlers’ that emerge move about to find new sites to feed. Scales tend to thrive on stressed plants. Scale control can be challenging and may need to be repeated over several seasons. OYSTERSHELL SCALE Lee Townsend, Extension Entomologist Oystershell scale is a common armored scale that can infest more than 100 pl ant spec ies. Oystershell scale is a hardshell scale, meaning that insects develop a hard, protective covering over themselves that is difficult to penetrate with insecticides. The oils can In different countries these agencies may differ greatly. A tree that large is past the point where hand removal of the scale is possible or practical. Management-biological control. Apply an insecticidal soap to the twigs and foliage of your red maple trees. The oystershell scale adult armor is light to dark brown and shaped like a tiny oystershell. This pest only reproduces once per year, with the egg hatch occurring in early to mid June over an approximate ten day period. Oystershell scale are found on trunks, branches, and twigs of many broad-leaved deciduous plants. It occurs throughout the United States and is more common in northern states than southern states. S123 Ag Science – North Check plants for live scale infestations. Oystershell scale crawlers emerge in late May or early June, the nymphs mate in midsummer and the adult scales lay their eggs in late summer or early fall. Insecticidal soaps provide a new alternative. Oystershell scales overwinter as eggs under the waxy cover of the female. They occur less frequently on the leaves and other plant parts. There is a definite reduction in the number of eggs produced when mites are present. Read the product label for guidelines on plant sensitivity and temperature restriction before buying and using these products. Oystershell Consumer Health. The insect is most vulnerable in June when newly hatched young are crawling about. Heavy infestations can kill twig or branches. Oystershell scale are preyed upon by parasitoid wasps and mites that feed on eggs under the scale cover. After oysterscale has established itself, horticultural oils cannot kill the pest. Barkis usually intact beneath a scale. Dormant oils are typically applied during February or March but may not be very effective against armored scales. Applications must target newly hatched scale crawlers which are active in June and July. Oystershell Laboratories is the name of our B2B business unit that will work in close collaboration with 3rd party consumer health companies – our Partners - who will market the products under their leading category brands. Scouting Notes Monitoring for scale should be conducted in orchards with a history of damage from this pest. Proper timing of insecticide applications is a major key to success. 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