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 vinifera L.

Category:

Biology descriptors

Status:

Crop Germplasm Committee approved

Data Type:

Alpha/numeric descriptor

Maximum Length:

Responsible Site:

SYSTEM (SYS)

Studies or environments

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

Code	Definition	Number of Accessions
1	very low (Carignan N), not limited and very vast attacked patches or totally attacked leaf blades-plenty of mycelium and ample fungus fructification	10
3	low vast attacked patches, some of them limited-leaf blade, partly attacked-plenty of mycelium and ample fungus fructification	28
5	medium attacked patches usually limited with a diametr of 2-5 cm	88
7	high 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)	59
9	very high (Kober 5 BB) punctuated attacked patchesor no symptoms at all-neither mycelium nor visible fructification (merely a slight curling of leaf blade)	70