Pine Needle Cast Treatment and Prevention

[DrBonsai]

Is Copper Sulfate (Copper Dust) or Copper Soap (Copper Octanoate) better
for bonsai applications to counter and prevent needle cast?
Bonide makes both and I wasn't sure if one was better than another for bonsai trees.

Is there a preference to using Daconil (Chlorothalonil) ?

 

[Cypress187]

Soap sounds better I have totally no clue as you could have guessed.

 

[Leo in N E Illinois]

I've used Daconil in the past, with un-even results. It seemed to work, but not always, perhaps I was not applying it correctly. I currently use Cleary's 3336 granulated. I use 1 tablespoon per cubic foot of soil in the pot. (rough estimate) and apply every 3 months. The Cleary's 3336 seems to work well.

 

[Brian Van Fleet]

Bonide Liquid Copper Fungicide Concentrate 6666011
Bonide
Link: http://amzn.com/B006NQWR7Y

 

[DrBonsai]

Thanks for the info. The Clearys' is applied to soil and systemic. Doesn't that hurt the Mycorrhizae (beneficial fungus) ?
The Bonide Liquid looks like its the copper soap.
After further digging:
http://www.sym-agro.com/documents/t...3-03-Effects-Fungicides-Mycorrhizal-Fungi.pdf

 

[DrBonsai]

This paper says Clearys' should have no inhibitory effect on Mycorrhizae.
http://www.growsafe.com.au/news/pdf...s and Insecticides on Mycorrhiza - Dec 12.pdf
Thanks once again for the recommendations.

 

[Mellow Mullet]

I use daconil, it works good, you just have to make sure to cover everything with it.

John

 

[Paradox]

The other thing you need to know about needle cast is that the needles are infected the season before you see it on the needles. So treating with a spray just when you see it doesn't do anything for the current manifeststion of the fungus. It should help to prevent next year's infection if you spray before and during the the time when the spores infect the needles.

 

[PaulH]

I also use Cleary 3336, Works well. Not only for needle cast but also for powdery mildew and black spot on my oaks.

 

[Leo in N E Illinois]

I've also used Clearys 3336 on my roses, and on crab apples (Malus), keeps the black spot under control.

 

[Leo in N E Illinois]

Thanks for the info. The Clearys' is applied to soil and systemic. Doesn't that hurt the Mycorrhizae (beneficial fungus) ?
The Bonide Liquid looks like its the copper soap.
After further digging:
http://www.sym-agro.com/documents/t...3-03-Effects-Fungicides-Mycorrhizal-Fungi.pdf

I looked at your reference. It has Clearys 3336 list both as benign and in the column as harmful. There is at least one other fungicide that is in both columns. What does that mean?

 

[DrBonsai]

Your guess is as good as mine, lol. I guess 2 reports had it neutral or positive and 2 reports had it negative. When I posed the question initially I wanted opinions on what other forum members used successfully.
Leo you have been doing this awhile, so if the Clearys 3336 works for you, I would keep on using it. There is no substitute for experience.

 

[Paradox]

I did forget to mention I use Daconil and Bonide Copper Fungicide. I alternate treatment during the height of fungus activity (humid, warm conditions)