Herman, when I got my Kathleen's Black from the person who found the tree. it had absolutely no FMV, what so ever. Or at least I could not detect any by looking at the leaves.
It came in bare rooted spring of 2010. I potted it up into a 5 gallon pot. It stayed in that pot until November of 2010. I then planted it in ground in November of 2010. and bent it to the ground and cover it with dirt.
It was planed about 7 feet from a Poplar tree stump that had started to dissolve into the soil.
When I uncovered the plant spring of 2011 it had suffered over 50 percent winter cold damage. I pruned off all the dead branches, and it grew back, very fast. But, the leaves grew back with heavy FMV in the leaves.
So, I'm wondering now if the winter cold possibly activated the dormant FMV in the plant. Or did the plant pick up the virus from the rotting poplar tree roots.
It's the only cultivar out of a dozen or so that has FMV, besides Sal's EL. Sal's EL, came from the same collector that we got our Kathleen's Black from. The Sal's EL started showing showing strong signs of FMV as soon as it rooted.
But, we planted it anyways, because we had been told by growers in our area that it was the gold standard for cold hardiness in our area. It was planted fall of 2010. As of this year the first of September, 2011, It is one of the most healthy looking plants we have. Even though like Kathleen's Black, it suffered about 50 percent winter cold damage.
At first I thought maybe the FMV was coming from the poplar decaying roots. But the Sal's EL is planted next to the decaying root system of a large ash tree.
I'm starting to wonder whether or not all figs carry the FMV. and if the plant is stressed or something, the virus gets a chance to take hold, like a cold virus in humans. But, some humans throw off the cold virus so fast they never knew they had it. While others become sick with it.
If you were to look at the Sal's EL right now you will have a difficult time spotting any FMV symptoms. But, with The Kathleen's Black plant you can spot it right away.
Has any one else noticed a correlation between winter cold damage and the FMV showing up in a particular cultivar, and then not showing symptoms once the plant starts growing vigorously again???????????????????
Bob