Author Topic: Pre-winter Fungicide Treatment Question  (Read 2797 times)

RJNick

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Pre-winter Fungicide Treatment Question
« on: October 14, 2013, 08:13 PM »
A couple of weeks ago, I attended a class on Japanese Black Pines in which it was stated that due to needle casts, Black pines should be treated with Dacanol or Cleary 3336 to prevent fungus infection, especially in this part of the country (MA).  Before placing my JBP in the shed for the winter, I'd like to give it a preventative fungus treatment but I read ele\sewhere that systemic fungicides such as Benlate ir Bononyl should not be given prior to winterizing your bonsai. 

My question is to whether anyone knows if Dacanol or Cleary are systemic.  I know that they are applied to the needles by have no idea whether their mode of action is systemic.  Would Cartan be a good alternative?

Thanks for the help.
 

John Kirby

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Re: Pre-winter Fungicide Treatment Question
« Reply #1 on: October 14, 2013, 08:23 PM »
Spray with Daconil or Lime Sulphur, don't cover until it gets cold.
 

RJNick

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Re: Pre-winter Fungicide Treatment Question
« Reply #2 on: October 15, 2013, 07:26 PM »
Thanks John,

I just checked my emails and as luck would have it, received an answer to my question from tox folks at UMass (thanks!) as well.  Turns out that Daconil and Captan are both contact mode of action only.  Daconil's claims are that the chemical promotes some natural systemic response (like an immune response) in the plants but there is no real data that it is effective against fungus as a systemic.  That also means both fungicides will have no curative ability once a fungus infection occurs and that in the spring, new growth will be suscepible to fungus.

Cleary's 3336 is a systemic, but one which only transports in the trees xylem meaning it will be transported up to the foliage, but will not have systemic activity on the root system.

Definitely sounds like I do not want to introduce Cleary's right now before mt trees begin dormancy.  again for the help.
 

John Kirby

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Re: Pre-winter Fungicide Treatment Question
« Reply #3 on: October 15, 2013, 07:43 PM »
I guess I thought you wanted to know what works. UMASS Extension is full of nice folks, however they know little if anything about overwintering Japanese Black Pines. Spray your black pines with Daconil and/or lime sulphur, you are trying to minimize infection in a damp overwintering structure. You can use Cleary's or Banner or Subdue max in March when the trees start to grow.

 
 

Chrisl

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Re: Pre-winter Fungicide Treatment Question
« Reply #4 on: October 16, 2013, 09:28 AM »
John, I thought lime sulfur was the default overwintering spray, both when you store them, and again in March.  Are you saying those other products are better for the early spring spray?
 

John Kirby

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Re: Pre-winter Fungicide Treatment Question
« Reply #5 on: October 16, 2013, 07:16 PM »
Lime sulphur works fine, so does Daconil. In big mixed collections, you may not want to lime sulphur everything.
 

RJNick

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Re: Pre-winter Fungicide Treatment Question
« Reply #6 on: October 16, 2013, 08:57 PM »
Thanks John,

I picked up the Daconil and will give it a whirl.  I'll save the systemic treatment for the spring.  Thanks for the help.