Where did you get your Black Madeira cutting from?

The source for the Black Madeira that everyone has is UCDavis as far as I know. The main tree is infected by it. However that means really nothing. The tree is vigorous and produces a decent crop in a potted tree just fine. Bass

So I just read the info at GRIN and saw Todd Kennedy gave it to UCD, for some reason I thought it was one of the old varieties... So Pacific Tree Nursery could have gotten it directly from him. I got Black Madeira from UCD, all of the varieties showed FMV symptoms at first from what I remember, planted in ground and didn't grow much... the roots rotted from snow melt running off a roof the first winter out but before it did I started another plant from it and kept that one in a container. It grew without any noticeable symptoms, and no stunting or anything, shorter internodes than normal but that is probably a variety trait. It's gone now too, I gave it to my brother who planted it out right before the polar vortex. Anyway, the same thing has happened with a bunch of varieties for me where cuttings from symptomless growths attached an "infected" tree usually make new symptomless plants. There are some elements of chance: how many plants to select from and what percent will show symptoms. Otherwise it can just be a matter of time and effort, stimulate it to grow fast remove any symptomatic growths and start a new generation to select from. FMV is not systemic, research shows is not present in the sap and not known to be transmitted mechanically by pruners or any bugs other than the fig bud mite. The virus particles are able to travel to adjacent cells only. So as long as the fig bud mite is not constantly infecting the buds then fast growth can reduce the amount of virus. There is a technique used in TC labs called thermotherapy where the plants are grown at high temperatures so the virus denatures and can't replicate so the new growth won't have any virus at all. Whether a tree has FMV but is below the threshold of causing symptoms or the tree does not have any FMV should not really matter much, the virus is only a problem when there are so many particles in the cells that they gum up the works and get in the way of things. Trees that don't show symptoms and those that are stunted and deformed are obviously not equal though. From what I understand the trees at Wolfskill are never treated for fig bud mites and are only pruned occasionally so they have a slower "mature" growth habit than a new plant or invigorated older tree. There was a survey done which showed nearly all of the trees tested there were positive for FMV. There are also a bunch of other viruses that complicate things and can be vectored by other specific bugs and maybe pruners in some cases, FMV was correlated with the symptoms long before they were discovered but some of them they might cause some symptoms alone or together sometimes. One virus even passes to seeds so it might have integrated into the genome and can be latent like that or become active and start replicating and possibly cause some symptoms, and it has been found in nearly every tree tested and the sanitation methods like thermotherapy that work for the other viruses have no effect. So without lab equipment it is really not possible to actually understand what exactly is going on with any given tree. The advice for nurseries coming from Universities though, prior to and aside from all of that other drama, is to not propagate from symptomatic fig trees. Commercial nurseries don't want to deal with customers calling for their money back because the leaves are deformed and people won't buy them. The situation among people selling to collectors is different though, the disclaimer says you take your chances and place your bets and maybe nurse a tree along for a decade ;) Sorry for the long rant Keith, hope it clears things up a little though.

Thanks for taking the time to post your video Tom. Have a BM from UCD since 2008 and displays heavy fmv , root pruned again last season and pruned canopy and displaying short nodal growth with many figs. It grew a sucker 2 seasons back and now in 30g pot produced last season and displaying many figs this season and to date shows no signs of fmv nodal growth is much better on this plant . Will eventually split this plant into 2 plants as it has separate main trunks. Recently set up an airlayer on it also since it is so healthy looking. In many past older readings when i was more into it was mentioned about multiple strains of fmv causing different effects and moves slowly thru out the cells of plant. My belief is one may be able to propagate a more healthy plant perhaps with less of the strains of fmv that would be present in parent plant. Martin