Dr. Subba Reddy PalliDepartment Chair & State EntomologistS-225 Agricultural Science Center NorthLexington, KY 40546-0091859.257.7450entchair@uky.edu, UK Entomology: Vision, Mission, & Core Values, Nancy Cox, Ph.D. Heavy infestations can kill twig or branches. The pest, which is an armored scale, is one of the most common of its kind with more than100 cropsbeing susceptible to it.. It develops on the bark of trunks and limbs of a wide range of commonly grown deciduous trees and shrubs, including aspen, ash, cotoneaster, poplars, willow and lilac. This systemic insecticide is a neonicotinoid that moves rapidly from the soil into the tree. Eggs hatch in mid- to late April and the crawlers are active into early May. ENTFACT-433: Oystershell Scale  |  Download PDF. Includes. For example, oystershell scale often damages aspen in a manner that allows for development and spread of cankers produced by Cytospora fungi. Developing oystershell scales feed by sucking the fluids of cells underlying the bark, often killing the cells at the feeding site. Dormant season oil sprays. Crawlers are very susceptible to control measures as they move over plant surfaces to find a feeding spot. CAUTION! The oystershell scale (Diaspididae Lepidosaphes ulmi) (Fig. 1) belongs to a group of insects called the armored, or hard scales. Scales tend to thrive on stressed plants. Scales tend to thrive on stressed plants. The Horticultural oil serves to suffocate the scale and eggs. Scale insects suck sap from plants, robbing them of essential nutrients. Applications must target newly hatched scale crawlers which are active in June and July. Before self-treating your trees, contact an ISA-certified arborist from Hansen’s Tree Service for a hassle-free consultation. Oystershell scale, as the name implies, looks like a miniature oyster encrusted on a small limb or twig. Let’s learn more about identifying scale and how to control them. Over the next couple of months they gradually increase in size and become full-grown in midsummer. May completely encrust branches. Development continues the following spring with mating occurring in late spring. Acting quickly to control scale insects gives an opportunity to save the health of a tree and enable it to gain back its energy before the glistening honeydew turns into a grey, sooty mold that not only is unhealthy but wrecks the aesthetics of a tree. Dinotefuran can be applied as a soil drench, for root uptake, or as a spray on the trunk, through which it is absorbed and subsequently translocated within the plant. Apply to CSU | Oystershell scale is present through harvest. Many other insects, including most that are considered ‘beneficial’ (pollinators, natural enemies of insect pests) are not adversely affected by this product. Their drab, bark-like appearance makes them easy to overlook, even on close inspection. As populations increase in number, entire branches may be encrusted with scales. This is because they fail to move in sufficient concentration to the feeding sites of these insects. Oystershell scale is a common armored scale that can infest more than 100 plant species. Insecticidal soaps provide a new alternative. Timing of crawler occurrence will differ between the two species. If this pest is not controlled early, leaves on affected twigs or branches drop and dieback occurs, both of leaves and twigs/branches. This pest only reproduces once per year, with the egg hatch occurring in early to mid June over an approximate ten day period. In general, controls will be more effective if the scale population on a plant is first physically reduced by pruning out heavily infested and sickly branches. But despite it's tiny size, this insect can cause significant damage in trees or shrubs. The scale overwinters in the egg stage under the females’ protective cover. Severely prune back heavily infested branches and protect new growth with insecticide applications. Management 4) White prunicola scale, Pseudaulacaspis prunicola may overcome this problem but control is still difficult. Oystershell scale is a very secretive little insect that usually goes unnoticed. (See CSU Extension fact sheet 5.569, Insect Control: Horticultural Oils). The life history of this insect in Colorado is incompletely known. Oystershell scale is an introduced pest in Calgary. Oystershell scale is a common armored scale that can infest more than 100 plant species. Insect growth regulators. Dean Two generations are produced per year. May completely encrust branches. . Wherever you live, Extension’s job is to determine what issues, concerns and needs are unique to each community, and offer sound and effective solutions. In some cases, large sized scales can be scrubbed off with a stiff brush.

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