Code:
OIV
461
Name: Leaf: degree of tolerance to phylloxera (leaf gall)
Category:
,
GROUP OF CHARACTERISTICS,
ORGAN,
ORGAN SUBPART
Subcategory:
PHYLLOXERA,
BIOTIC RESISTANCE - INSECT,
LEAF - MATURE,
BLADE
Code: OIV 461
Name: Leaf: degree of tolerance to phylloxera (leaf gall)
Category: , GROUP OF CHARACTERISTICS, ORGAN, ORGAN SUBPART
Subcategory: PHYLLOXERA, BIOTIC RESISTANCE - INSECT, LEAF - MATURE, BLADE
Primay descriptor priority list
For a quick characterisation of varieties the Genres CT 96 No81 - partners compiled a Primary description priority list. The list encompasses 14 priority one primary descriptors. The chosen descriptors show a good discriminating power between varieties. Most of them are easy to score.
Description
Observation: gall formation of phylloxera (Daktulosphaira vitifoliae) on mature leaves is evaluated; 1 = very large number of normal, fertile leaf galls; 3 = large number of normal, fertile leaf galls; 5 = fewer, small, normal shaped, fertile leaf galls; 7 = few, uncompleted sterile leaf galls; 9 = localized necrosis, punctures, no leaf galls.Level expression
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