The CODIT Principle Wound reactions of trees and consequences for arboricultural practice Prof. Dr. Dirk Dujesiefken Institute of Arboriculture Hamburg
The CODIT Principle
Wound reactions of trees
and consequences for arboricultural practice
Prof. Dr. Dirk Dujesiefken
Institute of Arboriculture
Hamburg
from:
Shigo & Marx 1977
From:
Shigo & Marx 1977
C Compartmentalisation
O of
D Damage
I in
T Trees
Desiccation
Dysfunction
Decay
The CODIT-Principle
The four phases of defense after wounding:
• Phase I - invading air and dessication
• Phase II - invading of microorganisms
• Phase III - spread of microorganisms within the wood
• Phase IV - wound closure (encapsulation of the decay)
(Dujesiefken/ Liese 2015: The CODIT Principle. ISA/US)
Phase I
Phase II
Phase III
Phase III
Phase III
Phase III
Phase III Phase IV
The compartmentalisation depends on
• Tree species
• Type of the wound
• Time of wounding
• Wound treatment
Compartmentaliser
weak
•Aesculus
•Betula
•Fraxinus
•Malus
•Picea
•Populus
•Prunus
•Salix
effectiv
•Carpinus
•Crataegus
•Fagus
•Gleditsia
•Platanus
•Pinus
•Taxus
•Ulmus
The CODIT Principle
• for a better understanding of trees
• how trees grow
• and how they defend themself
– Tree species
– Type of wound
– Time of wounding
– Wound treatment
for healthy and safe trees in our cities