Code:
OIV
462
Name: Root: degree of tolerance to phylloxera (root gall)
Category:
,
GROUP OF CHARACTERISTICS,
ORGAN
Subcategory:
PHYLLOXERA,
BIOTIC RESISTANCE - INSECT,
ROOT
Code: OIV 462
Name: Root: degree of tolerance to phylloxera (root gall)
Category: , GROUP OF CHARACTERISTICS, ORGAN
Subcategory: PHYLLOXERA, BIOTIC RESISTANCE - INSECT, ROOT
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
Evaluation of the degree to which tuberosities (galls on suberized roots) of phylloxera (Daktulosphaira vitifoliae) are formed. 1 = necrosis penetrates freely into the centre of central cylinder; 3 = necrosis penetrates into central cylinder, to a lesser extent; 5 = necrosis penetrates into the central cylinder to a limited extend; 7 = necrosis does not penetrate into the central cylinder and is isolated within the bark; 9 = very limited localized necrosis, punctures.
Level expression
