Blog Archives

Spruce Spider Mite Injury Appearing

Spruce spider mites (SSM), like other plant-feeding mites, use piercing-sucking mouthparts to feed on sap. Feeding from individual cells initially produces small, yellow splotches on needles. Over time, needles take on a dull, rusty appearance and some may drop prematurely. In

Posted in Landscape Trees & Shrubs

White Peach Scale

The white peach scale is increasingly more common as a pest of fruit and landscape trees. The waxy round coverings that protect overwintering females of this armored scale have orange to yellow centers that appear like tiny fired eggs. Scale

Posted in Landscape Trees & Shrubs

Rhizosphaera Needle Cast May Lead to Skimpy Spruce

Rhizosphaera needle cast is often to blame for brown or thin spruce in the landscape. In Kentucky, Rhizosphaera needle cast is the most common disease of spruce; it also affects some pine species. This disease causes needle drop on lower

Posted in Landscape Trees & Shrubs

Emerald Ash Borer Detections and Treatment Horizon

Abe Nielsen, Kentucky Division of Forestry Forest Health Specialist, reported first detections of emerald ash borer infested trees at locations in Clinton, Cumberland, and Wayne counties. The map (Figure 1) shows the extent of the known infestation. Is Preventive Treatment

Posted in Forest Trees, Landscape Trees & Shrubs

The Gall(s) of Some Trees

Galls are irregular plant growths that are stimulated by the reaction between plant hormones and powerful growth regulating chemicals produced by some insects and a few mites. Galls may occur on leaves, bark, flowers, buds, acorns, or roots. Their inner

Posted in Landscape Trees & Shrubs

Sudden Leaf Drop May Be Maple Petiole Borer

A sudden drop of many sugar maple leaves may be the work of small wasp larvae that burrow into petioles (Figure 1). The weakened stems usually break at a darkened area near the leaf blade (Figure 2). Usually, infestations are

Posted in Landscape Trees & Shrubs

Sawflies Slug Roses

Several species of slug sawflies injure rose leaves. Their slug-like bodies and feeding styles produce characteristic window-pane damage on leaves. These wasp larvae usually feed from the underside of the leaf, leaving a thin layer of pale green epidermis (Figure

Posted in Landscape Trees & Shrubs