pest photo

Mark Schwarzlander, University of Idaho,
St. johnswort borer
Agrilus hyperici

St. johnswort borer (Agrilus hyperici) is a beneficial insect. It is a native of Europe and was first detected in California in 1950.

This is an important biocontrol for St. John'swort. When the larvae is feeding within a root of a plant, it can entirely consume the tissues, severely damaging the plant. Flower production is reduced because stems produced from an infested root crown are stunted. Most infested plants are killed.
Summaries of State Plant Protection Laws and Regulations
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