Judith Singer wrote:I have what looks like crown gall on an important 3 year old seedling I've been watching :(
I know the bacterial dna can enter the distant tissues of the plant but does it always? I have many cuttings that have rooted and I'm wondering if I watch these for some time period, and they don't develop any galls, can I assume the new plants are clean? Has anyone used Actinovate? Gallex, Bacticin? It would be very easy to treat the small cuttings if that would help. All opinions and ideas welcomed!
Hot water treatment of grape vine cuttings has been fairly successful for eliminating crown gall from the cuttings, see, for example,http://www.ajevonline.org/content/41/4/325.short
"After one season's growth, less than 2% of the hot-water-treated, grafted vines showed crown gall symptoms. In contrast, up to 60% of untreated control vines were galled."
This treatment has also been somewhat successful for cherry and plum seedlings. Cherries and plums are members of the rose family. I don't know whether anyone has tried it with roses, but I'd try it, if I had an important seedling that was infected. Good luck!