The one with the growth at roots sounds like it might be crown gall (caused by a bacteria that causes galls to form). If that's what it is, it's a pretty serious problem that will likely result in the death of the tree. There isn't any treatment that I'm aware of. I've read of a biological control that works as a preventative, but I believe it doesn't help infected trees (I have no idea if it's available in Canada). The usual recommendation is to remove any infected plant and do not replant for at least two years.

I know that there are several sorts of cankers that can affect willows, but many of them can be controled by pruning and proper watering and fertilizing. Cankers usually only occur on stressed or injured trees - if you do have a crown gall problem it could be the cause of the stress.

BP

I have just been informed by my neighbor (a certified arborist), that my weeping willow is dying from an infection - but it was a quick conversation and I can't remember the scientific name he said. I also don't see him much b/c he travels. It presents just as jumper describes his tree and the rec was to remove the tree and all infected parts, then decide whether I wanted to leave the space empty or treat with a chemical that requires a license to even get.

Here's my question:

As the willow is centered 10-15 feet from other well-established screens and ornamentals, and I don't want to cause them damage - Can I just get rid of the illness and wait a few years or do I have to put down the chemicals to be sure that my other babies don't get sick, too?

Thanks for your input!