What to Watch For: Ambrosia Beetles in Perennial Fruit Crops

— Written By Hannah Burrack
en Español

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Damage from a cold winter can take a while to become apparent. During the summer, I often receive several about beetle damage in perennial fruit plants. When images accompany these questions, it is clear who the culprit likely was.

Granulated ambrosia beetle damage to fig tree. Photo via client.

Granulated ambrosia beetle damage to fig tree. Photo via client.

The distinctive “frass toothpick” extending from holes is due to feeding from granulated ambrosia beetles. Typically, these insects are attracted to stressed plants are likely keying in on trees, bushes, or vines that sustained freeze damage this winter. They are also attracted to plants with “wet feet”, so good water management can often reduce attraction. Once beetles are present in plants, there is no effective management tool. Steve Frank, who works on ornamental plants, has done work on timing of preventative treatments, which can be quite effective. However, in most fruit crops, ambrosia beetle attack is a symptom, rather than the cause, of a problem. If the underlying issue is water management, then drainage or irrigation should be improved. If the issue is a freeze damaged plant, then the plant may succumb to its other injuries regardless of preventative treatment for ambrosia beetles. Therefore, growers should consider if the cause of the stress can be managed before undergoing an extensive management program.

More information

How to beat the beetlesAmerican Nurseryman

Granulated ambrosia beetles – Entomology Pest Note

Written By

Hannah Burrack, N.C. Cooperative ExtensionDr. Hannah BurrackProfessor & Extension Specialist and Director of Education & Outreach, NC PSI Call Dr. Hannah Email Dr. Hannah Entomology & Plant Pathology
NC State Extension, NC State University
Updated on Jan 1, 2017
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