Ambrosia Beetles

Curculionidae: Scolytinae and Platypodinae

Ambrosia Beetles is a fungus-farming sapwood beetle umbrella associated with stressed or freshly cut woody plants, trunks, branches, nursery trees, logs, and woody debris. The beetles do not feed primarily on living wood tissue; damage results from gallery construction, vascular disruption, and associated fungi. Act before internal protection develops.

Identification

Adults bore into sapwood and excavate galleries where they cultivate and consume symbiotic ambrosia fungi. Small round entry holes, toothpick-like boring dust, dark gallery staining, and sudden wilt are common clues. Inspect trunks and branches for fresh boring dust, sap flow, stained galleries, and live adults. Collect adults from an active gallery because entry holes alone do not establish genus.

Symptoms / Signs

The beetles do not feed primarily on living wood tissue; damage results from gallery construction, vascular disruption, and associated fungi. Old holes may outlast activity.

Life Cycle / Process

Ambrosia Beetles undergoes complete metamorphosis. Egg placement follows the occupied site on stressed or freshly cut woody plants, trunks, branches, nursery trees, logs, and woody debris.

Prevention

Maintain vigor, prevent injury, and remove active reservoirs. Priority reservoir for this record: stressed or freshly cut woody plants, trunks, branches, nursery trees, logs, and woody debris.

Management / Control

Reduce tree stress, remove and destroy infested wood promptly, avoid storing fresh logs near production, and time any preventive bark treatment to adult flight before entry.

Procedure Steps

1. Inspect stressed trunks, branches, or twigs for fresh boring dust, toothpicks, or flagging. 2. Open one active gallery and collect the adult with stained wood. 3. Separate sapwood galleries from phloem galleries and record fungal staining. 4. Remove and destroy infested wood before brood emergence. 5. Reduce flooding, drought, transplant, or freeze stress and nearby fresh-log reservoirs. 6. Use preventive bark treatment only during confirmed adult flight and before entry. 7. Close the Ambrosia Beetles incident only after new internal injury stops.

Safety Notes

Protect food, seed, packaging, workers, and Myco-Patrons during inspection and treatment. Use tamper-resistant placements where baits or traps are necessary, and keep pesticides off food-contact surfaces. Structural or termite work may require a licensed Florida pest-control operator.