Code:
OIV
470
Name: Shoot: degree of resistance to Phomopsis cane and leaf spot
Category:
,
GROUP OF CHARACTERISTICS,
ORGAN
Subcategory:
PHOMOPSIS CANE AND LEAF SPOT ,
BIOTIC RESISTANCE - FUNGUS,
SHOOT - GREEN,
SHOOT - WOODY
Code: OIV 470
Name: Shoot: degree of resistance to Phomopsis cane and leaf spot
Category: , GROUP OF CHARACTERISTICS, ORGAN
Subcategory: PHOMOPSIS CANE AND LEAF SPOT , BIOTIC RESISTANCE - FUNGUS, SHOOT - GREEN, SHOOT - WOODY
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
To observe under conditions favourable to Phomopsis cane and leaf spot (Diaporthe ampelina), during pre-flowering and pre-veraison stages. Examination of the amount and size of the lesions/necrosis on the shoots. Symptoms: brown necrosis on the shoots that feel like a chocolate bar; pycnidia may be present on the necrosis. Possible confusions: downy mildew, weed killer phytotoxicity. 1 = Most of the shoots covered by brown, deep, and extensive necrotic lesions on the first 6-8 internodes, cortical whitening of the undamaged cortex. 3 = Almost all shoots/woody shoots with evident and widespread necrosis on the basal internodes. 5 = Slightly marked lesions on part of the basal internodes of some shoots. 7 = Small necrosis at the base of some shoots. 9 = No visible symptoms.Level expression
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