Insect Hotline Issue 20

close cluster magnolia scalehoneydew drop

Magnolia scale on star magnolia trees.  Notice the drop of honeydew about to fall from the swelling female on the right.  Dark patches on the trunk are sooty mold growing on the honeydew.

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Tuliptree scale on tulip popular.  This scale also produces copious amounts of honeydew and looks very similar to magnolia scale.  Microscopic investigation reveals which species.  Crawlers are active for both species about the same time and scouting is crucial to know when they are active.  Use GDD to target ideal scouting times.

Mealybug destroyer on scale

The white waxy insect in this picture is a lady beetle larva feeding on the adult scales.  All pictures were taken by:  Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Insect Hotline Issue 12






Cottony maple scale on a tulip tree.








Cottony maple leaf scale on dogwood.





Cottony camellia/taxus scale on holly.  The first and third picture was provided by:  Brian A. Kunkel, University of Delaware Ornamentals IPM Extension Specialist.  Cottony maple leaf scale image was provided by:  Nancy Gregory, University of Delaware Plant Diagnostician.

What’s Hot HL Issue 24

Tuliptree scale adults. Photo provided by: Lacy L. Hyche, Auburn University,

European hornet damage. Photo provided by: John A. Weidhass, Virginia Polytechnic Institute and State University,

European hornet damage and adult. Photo provided by: Jim Baker, North Carolina State University,

Oriental bittersweet foliage. Photo provided by: James H. Miller, USDA Forest Service,

Oriental bittersweet berries. Photo provided by: Chris Evans, River to River CWMA,

Multiflora rose infestation. Photo provided by: Nancy Fraley, USDI National Park Service,

Close-up of multiflora rose plant. Photo provided by: Chris Evans, River to River CWMA,

Mulitflora rose flowers. Photo provided by: John M. Randall, The Nature Conservancy,

Multiflora rose berries. Photo provided by: Barry Rice,,

Insect Hotline Issue 17

European fruit lecanium on blueberry. Photo provided by: Jerry A. Payne, USDA Agricultural Research Service,

Fletcher scale. Photo provided by: Whitney Cranshaw, Colorado State University,

Lecanium scales on Celtis laevigata. Photo provided by: James Solomon, USDA Forest Service,