Canker visable only AFTER application of Agri-Fos

[priley]

Hey folks:

This is new case for me, and wondering if any of you guys have ever had this. I typically spray a 47% water, 47% Agri-Fos and 6% Perma-bark solution for clients who are worried about SOD or see signs of SOD in their Live Oaks.

Sprayed this solution over the weekend, and only now do a few of the trees have visible cankers in the typical location of an infected tree.

Anyone else have this before? That is, a viably healthy live oak displaying cankers *only after* applying Agri-Fos and Perma-bark solution?

I feel I should spray the few trees that displayed these new cankers again, as I wasn't as aggressive with the solution since the trees offered no symptoms prior, and maybe also apply h2o2 on the cankers.

Good call? And have others had this happen to them?

Many thanks for reading,

patrick

Images of the new cankers a few days after the initial spray:

 

[treeseer]

doubt there is causality there, but client must be displeased...just unlucky timing?

How are the roots?

I'd scrape/scrub before disinfecting.

 

[priley]

Roots looked fine, but didn't run any tests. But there is no denying that all these cankers on various trees showed up only after I sprayed. I'd love to think unlucky timing, but these guys have probably more photos of their prized live oaks than their children. And they can show that none of these were there just a few weeks ago, which I'd also admit is true.

I scraped and scrubbed first, but am thinking I might want to apply more solution, if for anything else than to strengthen those trees which seemed to immediately develop the cankers.

You think it's an early case of SOD from the photos? It is certainly out here in Northern California.

Thanks again for your reassurance, but I've never seen this before.

patrick

 

[treeseer]

roots are not girdling stem?

i thought sod/ramorum usually had purplish droplets

i see black blotches like yours pretty often and just call it phytophthora-like infection, and trim away what is dead, and try to dry it up somehow. some people have cauterized those infections with a blowtorch...

you arent mike from nc are you?

 

[smokinj]

Not seen this before, but have seen chemicals speed up what is already going on and make things seem worst than when you started I would call the manufactor and they should point you in the right direction. Customers have a hard time when things happen like this.

 

[appalachianarbo]

you arent mike from nc are you?

Nope, I'm still here in NC, Guy.

 

[priley]

Gentlemen,

Just wanted to thank you for your advice and words of wisdom. It never occurred to me to contact the maker of Agri-Fos (Australians I think?) and ask if they have any cases of this or for materials to give to my clients. Would you guys suggest I spray the trees with the new cankers again to reassure the owners that we have done everything we could? As I said previously, I did not do a full 3 to 9 foot spray, since they trees looked perfectly healthy.

Thanks again to you all for the conversation.

patrick

 

[priley]

Treeseer,

Thanks especially for your questions. One of the trees does have one root that has a girdling root problem. But the tree is very old, and doesn't show sign of decline. I'd remove it if it was younger, but this particular tree, judging from the base, must be at least 100 years old.. so old, in fact, that it likely witnessed America's automobile market thriving.

What do you think? It's not interfering directly with the base yet.

patrick

 

[treesandsurf]

That weeping does not look like the typical bleeding and weeping color and pattern I've seen on SOD cases in Northern California. I wouldn't jump to any conclusions (especially while discussing with your clients).

"the final step in getting a confirmed diagnosis is to sumbit the symptomatic plant material to a laboratory for a series of tests.".

http://www.suddenoakdeath.org/html/diagnosis___sampling.html

Let us know what you find!

jp

 

[treeseer]

One of the trees does have one root that has a girdling root problem...It's not interfering directly with the base yet.

ok if it is not in contact with the stem then it is not a stem-girdling root but maybe just a circling root then yes should not be pruned in an older tree.. not sure what you have without seeing it.
you might also contact ralph zingaro who has been using phosphite longer than anyone i know of.