Descriptor: 066 Leaf: degree of resistance to Oidium (066 LEAF: DEGREE OF RESISTANCE)



 
Definition:
Attacked patches of all leaves 4-6 vines(=4-6 replications)have to assessed,if possible:-about 3 weeks after begin of flowering(growing leaves),-after vintage or before frost(mature leaves).Climatic influences have to be considered at the time of as.
Crop:
Vitis, V.vinifera x
Category:
Biology descriptors
Status:
Crop Germplasm Committee approved
Data Type:
Alpha/numeric descriptor
Maximum Length:
1
Responsible Site:
SYSTEM (SYS)


Studies or environments

Distribution of Values for 066 Leaf: degree of resistance to Oidium (066 LEAF: DEGREE OF RESISTANCE)

CodeDefinitionNumber of Accessions
3low vast attacked patches, some of them limited-leaf blade, partly attacked-plenty of mycelium and ample fungus fructification8
5medium attacked patches usually limited with a diametr of 2-5 cm117
7high limited attacked patches of smaller extent-little mycelium and limited fungus fructification (the presence of Oidium is only indicated by a slight curling of leaf blade)71
9very high (Kober 5 BB) punctuated attacked patchesor no symptoms at all-neither mycelium nor visible fructification (merely a slight curling of leaf blade)15