posted by Jamie @ 2:57 PM
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Not too sure about the vineyard name perhaps its one of the English ones Chapel Down. I do notice there is a distinct lack of grapes on the vines.
It looks vaguely autumnal?
Le Montrachet vineyard - Leflaive? or your own allotment in East London?
Must be in Burgundy, probably Grand Cru, but is there a giveaway in picture? It looks like diseased vines, on my screen it looks kind like dead ivy vines among the grape vines.
Looks like leaf roll virus to me.Could be anywhere.
Any vineyard in South Africa, that could be, then.
my guess is a vineyard belonging to Bize-Leroy in Vosne-Romanée, famous for the "manque de pieds" (grand cru or otherwise) in her vineyards. Just a guess based on your travels of late...
I spotted they were vines, the one in my garden looks a lot healthier and appears to track Jamie's one in that his photo updates look like mine.Not sure where, don't know enough about trellising, based on the vegitation northern europe.
Looks like Burgundy, suffering court noué as Keith says. Not sure if it would be Leroy's vines because court noué seems less prevalent with organically farmed vines.
Tricky. Leaves look Chardy, 3-wire trellis and tall canopy suggest perhaps more new world than old. Guess not biodynamie either as there are little cover crops. Degenerating and colour losing leaves are yearning court-noué as many of the above comments suggested. But as to the exact location, hard...
Thanks for all your suggestions. It's the famous Romanee Conti vineyard in Vosne Romanee - there's a patch of it (this bit) that looks distinctly yellowed and not very healthy. I was surprised. Could be chlorosis or some other nutrient deficiency, rather than virus?
nah--its leaf roll.Even your famous vineyards are not immune
I wish the picture was bigger.I would tend to agree with the leafroll diagnosis, except for the fact that the damage seems a little more localised to the top of the vine, the basal leaves still looking very healthy. There is some yellowing, but it is not interveinal chlorosis.If there was evidence of any webbing, I might suggest a spider mite infestation.
I've added a bigger picture
Hmmm...there doesn't appear to be any webbing, but there is some interveinal chlorosis which of course a white grape varietal would display (is this their Chard or Pinot?), but there is no rolling if the leaves. Plants do not seem to be in a water deficient state as the tendrils are still growing beyond the apical meristem.If it was a nutritional deficiency I may opt for magnesium as it is highly immobile in the soil, but then you get into the whole calcium/magnesium ration and I don't know the make up of the DRC soil. A good addition of dolomite may be in order.Whatever it is, photosynthesis is going to be majorly affected.Did you by any chance ask someone? Or is it far too hallowed ground to raise any questions as to possible farming inadequacies?
The leaves aren't rolling!
There are a number of factors which to me make this look like a nutrient imbalance and not a viral issue. I'd suggest that it isn't Mg deficiency as Mg shows as more marginal chlorosis on basal leaves, the younger leaves here show more entire chlorosis (with some chlorophyll still along veins)in comparison. Also Mg is a highly mobile element therefore if lacking it will be redistributed from the older leaves resulting in deficiency symptoms showing in the basal leaves. My two cents suggests perhaps Fe deficiency, this element is not as mobile and will therefore show symptoms in younger leaves and shoot tips. Also due to Irons link to the production of chlorophyll the entire shoot can appear yellow if limiting. Either way visual observations via pictures can be difficult to tell between these (and other) deficiencies.
Going back to my horticultural / plant science background I'm on a Magnesium or possibly a manganses deficiency.
DYL, I agree with your diagnosis, it probably is an iron deficiency due to the chlorosis in the younger leaves (due to the role iron plays in the synthesis of chlorophyll),and the likelihood of the vineyard having a high lime content. Like iron though, magnesium has an extremely strong cation adsorption rate and thus, while it may be mobile in the vine, it is highly immobile in the soil.We very rarely have either problem in California.
The leafs shows lack of magnesium (Mg), not virus inflection, on my opinion.
Could this have been taken in June time just as the vine is going into overdrive to ripen the fruit, and thus be the affliction coined as 'summer yellows' by Stephen Skelton?
Could this be the famous Summer Yellows, as described by Stephen Skelton, that come on as the vine is about to start really ripening the fruit?
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