MANUAL Part II Visual Assessment of Crown Condition - ICP Forests
MANUAL Part II Visual Assessment of Crown Condition - ICP Forests
MANUAL Part II Visual Assessment of Crown Condition - ICP Forests
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32 <strong>II</strong>. CROWN CONDITION ASSESSMENTS<br />
Affected part<br />
Branches,<br />
shoots & buds<br />
Stem & collar<br />
Specification <strong>of</strong> affected part<br />
(mandatory Level I and Level <strong>II</strong>)<br />
Current year shoots<br />
Twigs (diameter < 2 cm)<br />
Branches diameter 2 – < 10 cm<br />
Branches diameter ≥ 10 cm<br />
Varying size<br />
Top leader shoot<br />
Buds<br />
<strong>Crown</strong> stem: main trunk or bole within the crown<br />
Bole: trunk between the collar and the crown<br />
Roots (exposed) and collar (≤ 25 cm height)<br />
Whole trunk<br />
Code<br />
21<br />
22<br />
23<br />
24<br />
25<br />
26<br />
27<br />
31<br />
32<br />
33<br />
34<br />
Dead tree see below 04<br />
No symptoms on see below 00<br />
any part <strong>of</strong> tree<br />
No assessment see below 09<br />
Table A2-1: Affected parts <strong>of</strong> a tree and location in the crown.<br />
Location in crown<br />
(optional Level I,<br />
mandatory Level <strong>II</strong>)<br />
Upper crown<br />
Lower crown<br />
Patches<br />
Total crown<br />
Code<br />
1<br />
2<br />
3<br />
4<br />
Special cases:<br />
The following codes for special cases shall be reported in the column for ‘specification <strong>of</strong><br />
affected part’ <strong>of</strong> the tree:<br />
a. Dead trees:<br />
Dead trees should be reported using code 04. The cause <strong>of</strong> death should be reported in the<br />
column for the causal agent / factor.<br />
b. No symptoms at all are observed on any part <strong>of</strong> the tree:<br />
In order to avoid that the observers have to report that there are no symptoms on the foliage, nor<br />
at the branches and the stem, this case should be reported using code 00.<br />
c. No assessment <strong>of</strong> damage causes was made<br />
Report code 09 in the column for specification <strong>of</strong> affected part.<br />
A2.5.1.2 Symptoms and their specification<br />
Symptoms are grouped into broad categories like wounds, deformations, necrosis etc. A separate<br />
code (specification <strong>of</strong> symptom) allows for a more detailed description. Nests <strong>of</strong> caterpillars,<br />
fungal fruit bodies etc. are not considered as symptoms but are defined as ‘signs’ <strong>of</strong> insects,<br />
fungi, ... Their presence provides valuable information for diagnostic purposes and should be<br />
reported. If signs <strong>of</strong> insects or fungi are observed it is important to report also the observed<br />
damage symptoms.<br />
An overview <strong>of</strong> symptoms, specifications and codes is given in Table A2-2. For the field teams<br />
this table provides a complete overview <strong>of</strong> the section on symptom description, including the<br />
codes for reporting.<br />
updated 06/2006
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