Anthracnose treatment to replace ArborFos HP

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Snowbird

ArboristSite Lurker
Joined
Jul 13, 2010
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Location
slc, ut
I'm looking for an alternative to arborfos which has tripled in price for the liquid and gone thru the roof for the mauget autoinject. my london plane has been limping along for the last decade and shown improvements when treated a couple years back with the arborfos. currently it's tough to obtain the product and when you can the prices are excessive when compared to just a few years back. a 500ml bottle was $55 and reasonably priced for an anti fungal. any other options out there?
 
I'm not a fan of treating sycamore anthracnose.

1) It rarely impacts long-term health of trees.
2) Annual injections are going to take their toll
3) London Plane tends to be significantly more resistant than American sycamore
4) Bad outbreaks are so weather dependent, that we can't know before treating whether treatment will even be beneficial for that year.

Having said that, other options may include:
*Treat around the tree with Reliant Granular in late winter: https://questproducts.us/products/reliant-dry-granular/
*Do soil testing to see if nitrogen fertilization would be beneficial
 
thanks for the reply. so far i've only injected once for this tree and planned to do so every other year as directed. we commonly have wet springs and hot dry summers here in utah. in addition to seasonal fertilization, the tree gets watered deep every other day but still goes through several sets of leaves a season. they all end up with pinholes, off color, and curled up. the branches develop witches broom as well. this tree is on the west side of the house in the backyard which is important as it provides significant shade.

the pros that have been out all have differing ideas on how to deal with the tree. all are costly with no guarantees. so far, injections of arborfos seemed to show the only improvement we've seen. we're just not sure which way to move forward to return the tree to healthy leaf production.

stats:
32" DBH, 70' tall w/ 60' drip edge
tree was likely planted in the late 60's and has been in decline since summer 2006 when i purchased the house.
 
Maybe scale back on fertilization then...or at least make sure you are using fertilizers with a very low salt index. That can teall6 build up over time.
 
I don't think that is anthracnose. Anthracnose tends to be closer associated with the veins. Not that it perfectly follows veins and only veins...

Some example pictures:
https://www.fs.fed.us/r3/resources/health/field-guide/fd/sycamore.shtml

https://www.missouribotanicalgarden...seases/fungal-spots/sycamore-anthracnose.aspx

http://hyg.ipm.illinois.edu/article.php?id=795

I guess that is not your tree...right? I think those other leaf spots are one of several minor/insignificant fungal spots.

correct, not my tree but looks exactly like it. the leaves look similar to your links during different stages. i've had 3 different arborists out here over the last decade and all agree it's anthracnose. where they disagree is how to treat it. they all agree that they want piles of cash to do it and say there are no guarantees.

fwiw, the last guy out was 5 years back and spent half the day swinging from the branches nocking off the witches broom. he was big on getting all the dead leaves and branches off but letting the tree fix itself. that didn't seem to help the tree much but did lighten the wallet a bit.
 
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