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Western PA

Hello,

How detrimental to mycorrhiza is this product?

From what I have heard/read it takes about 10 weeks for mycorrhiza to colonize the root zone, if this is correct then the stump area of the plant should be fully colonized by around mid July, and if you are using chem fungicides I imagine that will set the mycorrhiza back some in there colonization of the root zone.

Can anybody give some input on using chem fungicides in combination with mycorrhiza? Are there any studies out there that will give you an idea what the impact level is of using the chem fungis with mycorrhiza?

Any input is appreciated, thank you!

3/28/2009 10:16:23 PM

Ctpumpkin@optonline.net

Here is a report on fungicide impact on mycorrhizae:

http://www.planthealthcare.com/UserFiles/File/TechnicalBulletins_HortTurf/Fungicide%20Effect%20on%20Mycorrhizae.pdf

Here is PHC's technical bulletin menu:

http://www.planthealthcare.com/HT/Bulletins

Eagle (myclobutanil) isn't named in this study but given the MOA its probably no worse than any other systemic.

3/29/2009 5:31:42 PM

Western PA

Yes, I have seen you post this document before and have read it over, And noticed Myclobutanil was not listed. You are very knowlegable in this field, will you being using Mycorrhizae and Myclobutanil together this season.

From what I got out of that report was most systemic fungicides are really bad for the mycor, although it looks like Daconil is on the good list of fungicides to use.

If using mycor in the stump area and along the main and the first few sec at the leaf nodes. When do you recommend starting fungicides, and which ones would you use to ensure plant health, while trying not to damage to many of the mycor colines.

Nothing to do with fungicies, but do you think applying mycor on the later half of the plant is not really that beneficial?

Thanks for your!!

3/29/2009 7:02:56 PM

Western PA

Thank for your help

3/29/2009 7:03:43 PM

southwest MO

PP You are going to use this product as a foliar I presume... The advantage it will give you in dealing with PM will out weigh any impact it may have from a few drips hitting the soil.

3/30/2009 9:36:08 AM

Windsor, Ontario, Canada

Daconil is a contact fungicide and thats why it is ok (unless you were to do a drench I imagine). Myclobutanil (Eagle, Nova, etc.) is a systemic and hence will make it to the roots...that is why it is bad. Some lists have no information on it, but most systemics are bad so only use it if you need to.

3/31/2009 9:19:14 PM

Ctpumpkin@optonline.net

We've used Eagle two years in a row. We're growing pumpkins. Not mycorrhyzae. Whatever suppression occurs we must be willing to accept is better than dead plants.

4/3/2009 9:22:08 PM

Ham Lake, Minnesota

Wouldn't systemics destroy the bad fungi that feed on the pumpkin plant and roots, but leave the mycorrhizae that is working with the plant alone?

4/14/2009 1:51:47 PM

Ctpumpkin@optonline.net

Mycorrhyzae is a beneficial fungus. Read the articles I linked for all the details.

4/15/2009 8:10:02 PM