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ordinary,VA

The spray program i used last year worked very well in my patch controlling pest & disease. I used three systemic and three foliar fungicides..
from what i have read systemic fungicides & Insecticides are very harmful to mycorrhizae..

so should i shelf the banner maxx-Merit 75 WP and products similar??
just use foliar spray program and hope for the best?
any input would be great thanks!

3/24/2008 2:27:30 PM

[email protected]

Fungicide Effects on Mycorrhizae

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

The following study included a variety of disciplines most of which proved to debunk all of the "bad" things we assume will happen to "good critters" when subjected to "chemicals".

I lifted the following text from:

http://aem.asm.org/cgi/content/full/70/5/2692

"Pesticides had no significant effect on community diversity or structure. Less research has been conducted on the effects of pesticides on soil fungal communities than on the effects of pesticides on bacterial communities by using molecular approaches. Neither tebucconazol nor azoxystrobin is a contact fungicide, but these compounds are absorbed into the leaf, where the infecting fungi can then absorb the active ingredient. The effects of such fungicides on soil microorganisms may be limited, due to their general immobility in soil (18). Soil organic matter and carbon have also previously been shown to protect against many pollutants by immobilization (22, 32, 41, 44) and have been proven to reduce imidacloprid sorption by competing with the pesticide molecules for sorption sites on the soil surface (23). These factors may explain the apparent lack of pesticide effects on the active fungal community in this study."

Interestingly, the rich biologically diverse living soils tend to do more harm to the translocation of systemic pesticides than pesticides do to harm the biology. LOL

It seems that mycorhhyzae competes with systemic pesticides for soprtion sites on the plant tissue thus rendering the pesticides LESS effective. Funny.

3/24/2008 9:17:34 PM

South East

high p wil effect them , so no ferts,,,,

3/25/2008 6:41:53 AM

Little-TON - Colorado

I do have a pretty good shot of Dr Lindermans slide on the control tests of fungicides......should I post it?

3/25/2008 9:43:01 AM

ordinary,VA

yes please wiz..thanks Steve & the Cooks

3/25/2008 3:53:48 PM

Little-TON - Colorado

Posted in the Photo Gallery

http://www.bigpumpkins.com/displayphoto.asp?pid=5736&gid=1

Perhaps Tremor will comment on this.......

3/27/2008 8:52:18 AM