idverde Bomendienst developed a fast, safe and reliable handheld microinjection system in the early 90s, allowing the vaccine to be administered to the tree in seconds. This enables the arborist to treat a large number of trees per day, saving on costs. This method makes it possible:

  • to inject the right amount of vaccine
  • to use it only on the targeted tree
  • to ensure a direct uptake by the tree
  • to reach the latest annual ring effectively with minimum damage
  • to minimize changes of breaking natural barriers between old infections and healthy wood
  • to protect trees on a large scale

Timing the treatment

DutchTrig® is applied once a year. This should be done in the spring once leaf development has reached at least 25% (as soon as the leaves start to emerge but before infections of Dutch Elm Disease can occur) but before elm bark beetles emerge. Injections later in the season can be compromised by early infections.

Where to inject

The vaccine is injected into the stem of the tree, usually at chest height, every 10 cm / four inches of tree circumference by pushing the chisel through the bark. One pull of the trigger will release a sufficient amount of DutchTrig®. Drilling, the use of pressurised equipment or root collar excavation is unnecessary. The chisel is designed so as that the latest annual ring can be penetrated without penetrating/damaging older annual rings. This prevents spores of previous encapsulated infections from being released into the newly formed growth ring.

Who injects elms?

The injection of elms is always done by specialists. Throughout the world, the vaccine is injected only by experienced partners who have been trained and approved by idverde Bomendienst. Our partners are listed here.