Insect Hotline Issue 24

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Acer with die-back caused by Japanese maple scale infestations.

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Close-up of an Acer branch with gloomy scale (dark circular raised) and Japanese maple scale (brownish is the underlying skin after waxy white has been wiped or worn away).  Japanese maple scale are also the white kind of oyster shaped insect on the branch.

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Close-up of an Acer trunk heavily infested with Japanese Maple scale.

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Close-up of Japanese maple scale on a Cornus trunk.  The brownish colored insects are the same scale, but where the white waxy covering has been worn or wiped away.  All pictures were provided by:  Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

What’s Hot HL Issue 21


Powdery mildew. Photo by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Japanese Maple scale on holly. Photo by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

Tuliptree/magnolia scales on magnolia. Photo by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

What’s Hot HL Issue 22


Features of Asian longhorned beetle. Photo provided by: Kenneth R. Law, USDA APHIS PPQ, Bugwood.org

Asian longhorned beetle exit holes and egg laying scar. Photo provided by: Kenneth R. Law, USDA APHIS PPQ, Bugwood.org

Egg laying scar on tree caused by Asian longhorned beetle. Photo provided by: Kenneth R. Law, USDA APHIS PPQ, Bugwood.org

Asian longhorned beetle adult. Photo provided by: Pennsylvania Department of Conservation and Natural Resources – Forestry Archive, Bugwood.org

Asian longhorned beetle larva in feeding gallery. Photo provided by: Steven Katovich, USDA Forest Service, Bugwood.org

Asian longhorned beetle larva. Photo provided by: Kenneth R. Law, USDA APHIS PPQ, Bugwood.org

Close-up of Japanese maple scale adults. Photo provided by: Central Science Laboratory, Harpenden Archive, British Crown, Bugwood.org

Ash borer larva. Photo provided by: David Cappaert, Michigan State University, Bugwood.org

Ash borer adult. Photo provided by: Daniel Herms, The Ohio State University, Bugwood.org

Puss caterpillar. Photo provided by: Gerald J. Lenhard, Louiana State Univ, Bugwood.org