Vine health issues: not currently resolved

Syrah disorder
Symptoms:

  • Red vine in late summer
  • no gophers (mounds), voles (holes around base), tractor damage, or blight
  • Swelling above graft union and pitting/grooving on scion (girdle causes red leaves)
  • Negative on virus panel.

Variation in symptom expression:
Clone susceptibility generally more important than rootstock.
Rootstock: Most symptomatic (99R, 110R), Least (5BB, Riparia (Gloire), 1103P, 101-14, 420A anecdotal)
rupestris in background may be a factor
Clones: Most symptomatic (73, 99, 301, 381, 382, 383), Intermediate or variably symptomatic (100, 174*, 300, 525, 585, 877**), Least (470, 471, 524, 747)
* Clone 174 was highly variable and was highly symptomatic in some tests.
**Clone 877 has been planted throughout Paso Robles and has been highly impacted by Syrah decline.

References:
Greenspan, Mark. Disorder has Syrah Growers Seeing Red.
Syrah Vine Health Symposium

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