NHBugs

Protecting trees and forests

Recommendations for homeowners and landowners

Management zones

Generally infested area
Emerald ash borer is in this zone, though not necessarily in all ash trees.

Potential expansion area
Emerald ash borer isn't known to be in the area, but the area is within 10 miles of the outer limits of the known infestation. There is a high probability emerald ash borer will spread naturally to this zone within a few years.

Alert area
Emerald ash borer isn't known to be in the area and it is more than 10 miles from the known infestation.

Definitions

Diameter at breast height (DBH)- Diameter of a tree at 4.5 feet above the ground

High-value ash- A tree valued for economic, ecological, aesthetic or cultural reasons.

Trap tree- A low-valued ash girdled to attract EAB and monitored by the N.H. Division of Forests & Lands.

 

 

 

 

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Recommendations for All
  1. Management zones, based on current known infestations, are established for all of New Hampshire. Know your zone. View updated maps. (see map):
    • Generally infested area- red zone
    • Potential expansion area (within 10 miles of the infestation)-orange zone
    • Alert area (beyond 10 miles of the infestation)- green zone
  2. Inventory your trees by species, size and value.
  3. Evaluate ash trees for signs of EAB. Report suspect trees or insects.
Generally infested- red zone
Landscape trees:
  1. You may remove all known infested trees near structures, cars and roads.
  2. Consider insecticide treatment for high-value ash. Ask three licensed pesticide applicators for quotes.
  3. Consider removing remaining ash trees while they’re still healthy—dying ash can be hazardous to remove.
  4. Use the material locally and follow best management practices when transporting logs.
Trees in natural settings:
  1. When a stand is being harvested, cut all large ash. Encourage small sizes under 4 inche in diameters. Protect and encourage ash regeneration.
  2. Identify several large, mature ash in pairs of a male and female as a seed source. Treat with pesticide every three years using a licensed applicator.
  3. If the harvest area isn't heavily infested, girdle 20 to 30 sawlog-size ash in advance of the timber sale. These trap trees will attract egg-laying adults and the larvae will be destroyed when the trees are harvested. Girdle using hand tools in the early spring before the scheduled harvest.
  4. Follow best management practices when transporting logs. Consult the Legal transportation of ash wood products from NH & VT to ME, if moving ash into those states.
Potential expansion area- orange zone
Landscape trees:
  1. Consider removing ash trees while they’re still healthy—dying ash can be hazardous to remove. 
  2. Consider insecticide treatment for high-value ash. Ask three licensed pesticide applicators for quotes.
  3. Identify large, healthy ash trees and monitor them for signs of EAB regularly.
Trees in natural settings:
  1. Identify forests with high volume ash and monitor.
  2. Harvest ash only during regularly scheduled management
  3. During regularly scheduled harvests, remove large diameter ash leaving small amounts of small diameter ash.
Alert area- green zone
Landscape trees:
  1. Consider removing ash trees while they’re still healthy—dying ash can be hazardous to remove. 
  2. Identify large, healthy ash trees and monitor them for signs of EAB regularly.
Trees in natural settings:
  1. Inventory and monitor and plan for the EAB arrival.
  2. During regularly scheduled harvests, if there are ash trees, and you won't re-enter the stand to harvest within the next 15 years, treat the site as if you were in the orange zone.