Hi Rafed ,
to be honest i dont really know .
This is what have observed so far. You ready ? I hope i do not bore you with this. ; )
My Vdb which has Fmv got better later last season much much (hardly noticeable ) better but i call it hiding as it still has it, it does not go away so to speak only hides.
I was looking at it today and it looks great but i did see it faintly with the sun shinning on it as i was inspecting the leaves but only a few leaves showed it and of course the leaves are not full size yet. Same as last year and im thinking as season marches on it will be same as last year as well hardly noticeable if at all. Out of my 1 year plants i lost 3 this season coming out of dormancy , one of them i rooted mid season last year a VdB for my neighbor and it is smaller than the 3 i lost so it seems at leaast to me it can take the cold storage, all the 1year olds were grouped together in garage for storage.
Out of my plants that do have the FmV (not all do) i noticed there symptoms are not all equal, some have only mishappen leaves, some only discoloration in leaves and then
my Ischia Black - the problem child of all my plants , badly mishappen leaves, stunted, mottled leaves and loss of chlorophyll in leaves. It is just starting to awaken. This plant seems to show EVERY symptom FMV has to give and is severly affected by it. I know my plants that have it as some are growing like a weed 2 are a little slow but steadily growing but ischia black im trying to work with it by and as always trying to get a few more in scion or plants to experiment with as its always been my hope to get one to grow more normal.
Its fun for me when it comes to observing all my plants and trying to help them as best as i can.
The season looks promising so far as this is an early start for me this season.