North American Fruit Explorers mailing list at ibiblio

[mauch1@aol.com]

I can't comment on mycorrhziae and fungicides, but I was at a 
pesticide credit meeting last year where the extension scientist from 
Penn State discussed fungicide's mode of action.  Acting as a barrier 
is a main mode of action.  But some fungicides kill the spores at 
spore germination or as they enter a cell.  And some of the newer 
fungicides (Strobilorin's (sp?)) are actually systemic (can kill a 
fungal infection after it starts).  Some fungiicides have multiple 
modes of action.

[aside: That's why molds so rapidly develop resistent strains to 
Benlate (which only has one mode of action) while Captan (which has 3 
modes of action) has not been overcome by resistent strains.]

I would probably stay away from "systemic" fungicides (most of which, 
I believe require an applicator's license anyway).

Chris Mauchline
SE PA, zone 6

--- In nafex@y..., "Doreen Howard" <doreenh@t...> wrote:
> No, if you are using a contact fungicide which coats plant 
foliage.  I've
> used neem seed oil, a fungicide, and never had any kill problems.  
The way a
> fungicide works is to coat foliage and act as a barrier to fungal 
spores.
> This action has absolutely nothing to do with mycorrhziae, which 
exists in
> the soil.  Even if the fungicide washes off trees and ends up in 
the soil,
> there is no problem.  As I said, fungicides are barriers.
> Doreen Howard
> 
> -----Original Message-----
> From: Tom Olenio <tolenio@s...>
> To: nafex@y... <nafex@y...>
> Cc: BiovamMycorrhiza@y... <BiovamMycorrhiza@y...>
> Date: Tuesday, February 13, 2001 1:56 PM
> Subject: [nafex] Fungicides & Mycorrhiza Fungi
> 
> 
> >Hello All,
> >
> >Does fungicide kill off mycorrhiza fungi?
> >
> >If we are buying mycorrhiza fungi and using a fruit spray
> >program that includes a fungicide, are we throwing our money
> >away on the mycorrhiza?
> >
> >Just want to make sure.
> >
> >If it is only certain fungicides that kill mycorrhiza, which
> >ones are safe to use with mycorrhiza treated material?
> >
> >Regards,
> >Tom
> >
> >--
> >Thomas Olenio
> >Ontario, Canada
> >Hardiness Zone 6a
> >
> >
> >
> >
> >
> >
> >


------------------------ Yahoo! Groups Sponsor ---------------------~-~>
eGroups is now Yahoo! Groups
Click here for more details
http://click.egroups.com/1/11231/0/_/423498/_/982163699/
---------------------------------------------------------------------_->