I can't stop Brown Rot - Is Cherry Tree Age a factor?
Well I'm about done. I'm seeing BR & some kind of rust on the leaves of my 15 year old Northstar cherry tree.
I had it last year for the first time and stopped it with a rescue application of Chlorithanil, then I raked and all that jazz prior to winter and vowed to be diligent about spraying the next year.
So I sprayed:
4/12 Dormant oil at green-tip
4/20 Chlorithanil fungicide at bloom with some petal fall
5/02 Bonide Fruit Tree Spray
5/08 Malithion insecticide
5/14 Immunox fungicide
5/21 Infuse fungicide (after finding 20-30 fruit with BR)
5/26 Bonide FTS
5/28 Infuse fungicide (out of frustration...)
I was pretty bummed when I first noticed BR even after having sprayed with Chlorithanil, Bonide FTS, & Immunox.
That's when I tried to obtain some Monterey Fungi Fighter rather quickly. Unable to do that, I found the same ingredient in Bonide Infuse. All I could get though was the bottle with a hose-end sprayer.
I sent an email to Bonide to see if I'd be okay to use it as a tank mix, wanting to be sure it wasn't somehow watered down. I didn't hear back from Bonide before I felt like I couldn't wait any longer so I ran some hose out and drenched the tree using the hose end sprayer. Bonide got back a few hours later and said it would be fine to mix it, that the hose end bottle is the same exact thing as the stuff in their concentrate bottle.
Then I started to notice rust like spots on the leaves, but thought I was maybe just a little too tightly wrapped, maybe I should not worry so much about less than perfect leaves. (But cherry leaf spot was in the back of my little mind!)
Today I was looking it over pretty good and a majority of the fruit now have some brown spots and/or rust on them with a couple that I saw being half brown and the tip of the brown has what looks like the beginnings of white powder mold/spore like stuff.
So even though it's only been 7 days since my last Infuse application, out of frustration (and desperation) I went ahead and hit it again with Infuse - this time as a tank mixture.
I'm not very experienced with managing fruit probs, and given this stupid BR thing has gotten to my NS Cherry both last year and this, I'm wondering if it has anything to do with it being 15 years in the ground or probably 17 years old.
I don't know, mainly just venting I guess.