The BBCH Scale for bud development

I think I've come across the standard scale for grape bud development, the BBCH scale for grapes. BBCH stands for  "Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie".  The scale seems to have been first published by Lorenz in 1994, and subsequently expanded.  Each stage has a number.  The whole scale covers the whole year.

Here is the 'sprout/bud development' scale:

00     Dormancy: winter buds pointed to rounded, light or dark brown according to cultivar; bud scales more or less closed according to cultivar

01     Beginning of bud swelling: buds begin to expand inside the bud scales

03     End of bud swelling: buds swollen, but not green

05     “Wool stage”: brown wool clearly visible

07     Beginning of bud burst: green shoot tips just visible

09     Bud burst: green shoot tips clearly visible

Of these, '03',  '07' and '09' are marked by relatively clear events.  '03' is marked by the parting of the bud scales.  '05' is marked by the first sign of green leaf forms.  '09' is marked by the a green shoot tip emerging from the tight leaf cluster.

Past years, the only thing I noted in my records was '09', and my 'criteria' was a leaf size.  Prior stages were ignored. Oh, well.

With all this in mind, what I photographed last weekend was '03', as in almost every case the bud scale had parted, and wool was visible.

Here is a page with photo examples:  2011 Budbreak