originally posted by Brzme:
originally posted by nigel groundwater:
OTOH Eric questions later 'what about Bretts' [ i.e. what about SO2 as a prime controlling mechanism for brett particularly if there is to be no filtration]which as wild native yeasts might also be considered part of the terroir since they can emanate from the vineyard.
Nigel,
Acetic bacterias too.
Is vinegar the ultimate expression of terroir?
Well, they usually are more varietal driven than terroir to my taste...
Bretty wines often taste like bretty wines whether they come from burgundy, rhone or sicily, again to my taste though I kind of like a light touch of brett in some of them. But I wouldn't say it is a differentiation characteristic of terroir (I like big words)
Eric the reason I picked up on your brett reference was simply that SO2 both before and during fermentation is [as I understand it] one of the key means of controlling brett [if it is present in the must/in the vineyard/ on the grapes etc as opposed to in the winery barrels/equipment] and preventing its active and occasionally excessive participation during fermentation - particularly if there is any slow down or stall by the desirable fermentation yeast/s for whatever reason.
When one talks about 'clean' grapes is it that they have been tested and found free of any 'nasties' which means that the hygiene aspect of SO2 [as compared with its anti-oxidant function] can be dispensed with? Can we assume the 'nasties' include brett yeasts and dysfunctional bacteria like acetobacter and no sulphur winemaking proceeds on the basis that these are not present in the grapes being used?
Also I am not sure I understand your comment that SO2 is:
totally useless on unclean wines (the SO2 will combines very fast and the remaining free sulfur will be close to 0) most if not all of the sulfured bottlings are kieselghur filtered or fined.
You go on to say: I don't know a single producer who just add, right before bottling, on the exact same wine some SO2 to only some of the bottles.
Surely the bactericidal/yeast control aspect of SO2 would work even on unclean wines? Perhaps I dont know what you mean by unclean.
When you are talking about SO2 combining fast with free sulfur close to zero are you talking about its anti-oxidant role and its binding with acetaldehyde rather than its other function of hygiene [bactericide/yeast control brett in particular].
And isnt the reason that some SO2 is added before bottling primarily for anti-oxidant rather than hygiene purposes i.e. to continue to mop up the products of any oxidation although there is presumably some residual bactericidal function? For those wishing complete chemical and physical control there is of course the availability of Velcorin and/or filtration but that would be anathema to any natural wine model.
According to their website the Lapierres produce 3 versions of their standard Morgon in roughly equal measures i.e.1/3rd each: completely unsulphured and unfiltered and requiring special temperature handling thereafter; sulphured only at the pre-bottling stage and unfiltered and as per the second third but also filtered.
I understand your comment that bretty wines "often taste like bretty wines whether they come from burgundy, rhone or sicily" but that does depend on what mix of volatile phenols and fatty acids, with their quite different odours and tastes, the brettanomyces yeast/s [usually but not exclusively bruxellensis] has produced in the ferment - and possibly later if any live cells have escaped into an unfiltered bottle.
While brett can smell/taste the same [as you said] it can also be perceived quite differently depending on the mix of compounds produced from the natural raw materials - even though that difference is often a function of who is doing the smelling and their [different] sensitivities to the multitude of brett products.
And while I also understand your caveat about brett [which can be a native, in-the-vineyard yeast surely?] not being a differentiation characteristic of terroir [and wouldnt want to argue that it was in any useful sense] it must then be an exception to the idea expressed in this thread that if its from the vineyard then its terroir and if it isnt it isnt.
I am sorry this is so long and is absolutely not intended to be argumentative but is my rather incoherent search for more information and understanding from somebody who actually makes great wine successfully. In particular the use [if and when or not at all] of SO2 in the making of successful wine and how it relates to brett and other possible spoilage mechanisms.