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Community knowledge. Shared responsibility. Living islands.Hawaii Invasive Species CouncilMālama ʻāina · Community biosecurity
Coconut rhinoceros beetle

Prevent Spread & Manage Green Waste

Plan for mulch, compost, dead wood, and material movement before they become a recurring CRB problem.

Source check: October 17, 2026

Prevention belongs in the everyday decisions of a garden, farm, nursery, or landscaping operation. Know what material is present, where it came from, and who is responsible for its management.

Look beyond the coconut palm

CRB breeding material can include mulch, compost, decaying stumps, dead trees, and other decomposing plant material. The response program emphasizes reducing unmanaged accumulations and treating infested material before removal. Simply relocating a pile can relocate the problem.

Keep the receiving site in mind as well as the source. A delivery plan should include how material will be inspected, stored, managed, and used, rather than ending when a truck unloads.

A proposed material log

Our suggested community practice is to keep a short record for each incoming batch. This is a transparency tool, not a certification that a batch is pest-free.

  • Supplier, delivery date, origin, material type, and approximate quantity.
  • Any treatment documentation supplied and the date of treatment.
  • Receiving location, responsible person, and next inspection date.
  • Observed insects, photographs, and actions taken.
  • Destination and authorization for any later movement.

Composting requires active management

CRB Response’s composting guidance stresses sustained heat throughout the material, including cooler portions, rather than a single warm reading. It also discusses durable sealed storage and site-specific advice. A pile that feels hot at the center should not automatically be described as treated.

Before bringing material onto a property, decide whether the people, space, equipment, and follow-up are available to manage it. If those are missing, reconsider the delivery or obtain help with a suitable treatment and disposal route.

Why mulch texture matters

A 2018 University of Hawaiʻi laboratory study found that females preferred finer mulch over coarser mulch for egg laying. No eggs were laid in the offered sand. The experiment identifies a breeding preference; it does not demonstrate that coarse mulch is safe, or that sand placed in a palm crown prevents damage.

Coordinate before transport

Confirm current movement requirements and receiving-facility instructions with the responsible authority before transporting suspected infested material. Avoid treating an old webpage, a neighbor’s experience, or a receipt as current transport permission. Keep the advice you receive with your material log.

Read the original material

Sources & further reading

References support the topics discussed above. A link does not imply partnership or endorsement. Some external sources also discuss treatments outside this site’s nonchemical scope.

  1. CRB Response — Breeding material and management overview

    Supports breeding-material examples and treatment before removal.

  2. CRB Response — Safe composting tips

    Updated July 1, 2025. Institutional guidance; site-specific implementation matters.

  3. Manley, Melzer & Spafford (2018) — Egg-laying preferences

    Primary laboratory study. Insects 9(4):141; DOI 10.3390/insects9040141.

  4. Department of Agriculture and Biosecurity

    Authority to consult for current movement rules and restrictions.

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