The CODIT Principle - Institut for Geovidenskab og...
Transcript of The CODIT Principle - Institut for Geovidenskab og...
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