Best Management Practices for Christmas Tree Export

This bilingual (English and Spanish) field guide provides Christmas tree producers with information on identifying and managing pests of concern to export trading partners. It features best management practices to help minimize the presence of pests at harvest and describes how to identify these problems. It includes management calendars, pest quarantine information, legal considerations for exporting, and options for monitoring and trapping.

Identify and Manage Pests

Arion rufus. (Photo courtesy of Oregon Department of Agriculture.)
This week:
  • Eggs will hatch in favorable conditions.

  • Adults and juveniles are present, but not active.

Learn more about Slugs
Más información sobre Slugs

(Photo courtesy of Oregon Department of Agriculture.)
This week:
  • Look for larvae in needles.

  • Look for symptoms: swollen and yellow needles present.

  • Remove infested trees.

Learn more about Douglas-fir Needle Midges
Más información sobre Douglas-fir Needle Midges

Vespula alascensis (vulgaris) worker. (Photo courtesy of Oregon Department of Agriculture.)
This week:
  • Look for eggs.

  • Look for males.

  • Look for queens.

  • Scout fields for presence of workers and nests.

  • Trap queens in May; trap workers and treat nests June to September.

Learn more about Yellowjackets
Más información sobre Yellowjackets

Photo of root weevil
This week:
  • Look for adults

  • Look for eggs.

  • Look for symptoms: notched needles present.

  • Monitor for adults with traps/boards or by scouting at night.

Learn more about Root Weevils
Más información sobre Root Weevils

Cylindrocopturus furnissi. (Photo courtesy of Oregon Department of Agriculture.)
This week:
  • Control Adults.

  • Look for adults.

  • Look for eggs.

  • Look for larvae.

  • Look for symptoms: dead branches present.

Learn more about Douglas-fir Twig Weevils
Más información sobre Douglas-fir Twig Weevils