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Ad hoc group Biotic Damage

Ad hoc group Biotic Damage. Draft Guidelines Damage Causes. Brussels May 2001: Group meeting (10 ctries + EC) Nancy October 2002 Core group meeting (8 ctries + EC). Meetings. 1. OBJECTIVES. to assess the impact of damage factors on crown condition.

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Ad hoc group Biotic Damage

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  1. Ad hoc group Biotic Damage Draft Guidelines Damage Causes

  2. Brussels May 2001:Group meeting (10 ctries + EC) Nancy October 2002Core group meeting (8 ctries + EC) Meetings

  3. 1. OBJECTIVES

  4. to assess the impact of damage factors on crown condition

  5. to provide baseline data on the- distribution- occurrenceof biotic agents / damage factors in Europe

  6. to contribute to other aspects relevant for forest policy like- biodiversity- climate change - sustainable forest manag.

  7. 2. APPROACH

  8. Improve data quality: Description of symptoms separate coding for symptoms / causes Guidelines for observers: focus on more relevant symptoms connect symptoms to possible causes (expert confirmation needed) 1. DIAGNOSIS2. QUANTIFYING DAMAGE

  9. list of damage symptoms connected to possible causes for main tree species in Europe adapted lists with a selection of relevant symptoms and causes for 3 climatic regions (central, southern and northern Europe)

  10. I. Affected part of tree II. Symptom class III. Symptom category 1/ Leaves/needles 2/ Shoots / buds 3/ Branches 4/ Stem 5/ Collar / surface part of roots Symptom Description

  11. Insects (code: 200) Defoliators (210) Xylophagous insects (230) Gallmakers (240) Piercing & sucking insects (250)

  12. Defoliators (210) Free feeders (211) Leaf miner (212) Skeletonizer (213) Leaf roller (214)

  13. Oak with leaves eaten by free feeding caterpillars Scots pine with brown discoloration of 2nd year needles and older needles missing (needle cast - Lophodermium seditiosum) Symptom code: 101 31 Cause code: 211 Symptom code: 107 44 Cause code: 311 02

  14. Improve data quality: level I: include quantification same method for level I / level II 1. DIAGNOSIS2. QUANTIFYING DAMAGE

  15. Quantity of the part of the tree affected (%) Actual scoring (manual): 5 % steps DAMAGE EXTENT

  16. 50 % of the leaves completely eaten versus 50 % of leaves with some small holes “magnitude” of the effect on leaves, shoots, ... INTENSITY

  17. Oak with 50 % of leaves completely eaten by free feeding caterpillars and newly developped leaves slightly infected by Powdery mildew

  18. Level I: once (normal CCA) Level II ‘key’ plots (complete progr.):  min. 2 observations  timing 2nd visit: when main damage cause is supposed to be at its maximum (cf. early warning system) Frequency of observations

  19. DIAGNOSIS: Add symptom description Separate coding for symptom and causes provide symptoms - causes list hierarchical system for reporting 2nd visit in key Level II plots Training of observers, use of photoguides, more involvement of experts 3. RECOMMENDATIONS

  20. include damage extent in Level I include intensity same scoring system for all parts of tree and all symptoms Quantification

  21. Finalise guidelines and circulate to Crown EP for comments 4. OUTLOOK

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