University of Kentucky College of Agriculture
| Scale | Host | Appearance | Crawlers Active in Kentucky |
|---|---|---|---|
| Cottony Maple Scale | maples, other woody plants | flat, oval, brown, 1/8 inch long with large white cottony egg sac protruding from under body | early September |
| Euonymus Scale | Euonymus spp., Pachysandra, Bittersweet | females: dark brown or gray, 1/16 inch long, resemble oystershell scales, pear-shaped; males: smaller, narrow, white. | First brood: late May; Second and third broods: late July to early September |
| Juniper Scale | Juniper, Arborvitae | female: circular, flat, dirty white, 1/20 inch, yellow exuviae off-center (looks like a fried egg); males:smaller, narrow, exuviae located at end of shell | mid-May |
| Lecanium Scales | Arborvitae, Sweetgum, Zelkova, other hosts | mostly hemispherical or turtle-shaped, brown, 1/8 to 1/6 inch. | varies with species |
| Magnolia Scale | Magnolia, Tuliptree | broadly oval, convex, 1/2 inch long | early September |
| Obscure Scale | Pin Oaks, Hickory, Walnut | roughly circular, flat, 1/8 inch, exuviae form a central spot surrounded by a gray ring | June through August; late July is best time for a single treatment |
| Oystershell Scale | Lilac, Maple, Willow, other hosts | oyster-shaped, gray, 1/8 inch, exuviae accumulated at narrow end | early May when hawthorn blooms |
| Taxus Mealybug | Taxus, (apple, cedar, linden, maple) | adult mealybug is approx. 8 mm long, they cluster in crotches of twigs and branches; white-gray in color | latter half of May, summer |
| Tuliptree Scale | Tuliptree, Walnut, other plants | hemispherical, 1/3 inch | late August |
| Walnut Scale | wide variety of deciduous trees and shrubs, rarely on conifers | nearly circular, flat, gray with a reddish-brown spot | mid-June, late August to early September |
Revised: 7/96
CAUTION! Pesticide recommendations in this publication are registered for use in Kentucky, USA ONLY! The use of some products may not be legal in your state or country. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication.
Of course, ALWAYS READ AND FOLLOW LABEL DIRECTIONS FOR SAFE USE OF ANY PESTICIDE!
Images: University of Kentucky Entomology
