Code:
OIV
455-1
Name: Leaf: degree of resistance to powdery mildew (leaf disc test)
Category:
,
GROUP OF CHARACTERISTICS,
ORGAN
Subcategory:
POWDERY MILDEW,
BIOTIC RESISTANCE - FUNGUS,
LEAF - MATURE,
LEAF - YOUNG
Code: OIV 455-1
Name: Leaf: degree of resistance to powdery mildew (leaf disc test)
Category: , GROUP OF CHARACTERISTICS, ORGAN
Subcategory: POWDERY MILDEW, BIOTIC RESISTANCE - FUNGUS, LEAF - MATURE, LEAF - YOUNG
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
The resistance of grapevine varieties to powdery mildew (Erysiphe necator) is to be observed under field trials over several years without the use of chemical plant protection and/or resistance inductors. - Observation of young leaves during the entire growing season on vines without fungicide treatment. - Application of dry fungus spore inoculum to the upper side of leaf discs of 20 mm of diameter and placed in Petri dishes using a brush. - About 1,000 spores per leaf disc is ideal; the density can be monitored by randomly placing microscope cover glasses among the leaf discs and counting spores under a binocular scope. - Incubation: 12 days at 23 °C and long day conditions (16 h light of 70 µE/m² sec corresponding to 3,000 Lux). - Place leaf discs of example varieties as control samples every 4-5 culture dishes. The symptoms should be evaluated considering the climatic conditions, that could influence the evolution of the disease, and, possibly, on plants without any biotic or abiotic stresses.Level expression
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