----- Original Message -----
Sent: Monday, February 19, 2007 11:11
AM
Subject: Re: [NAFEX] Organic solution to
bacterial spot
Hi Randy,
The label on my bottle of liqui-cop (8%copper)
says 2 tsp. in the dormant period and 1/2 tsp as a post bloom spray.
Apply twice during the season but not later than 3 weeks prior to
harvest. One nice thing about copper is that it
fights leaf curl as well as bac. spot. I used it last
season and had less bac. spot than the previous season.
But, it wasn't as wet here last spring so that may have accounted for less
bac. spot. I quit using it though, because a soil test determined I
had high copper levels in the soil. Copper can be toxic to plants at
high enough levels and also toxic to aquatic life. Another thing to
consider is copper has a slight acidifying affect on soil. Since you are
back east your soil may already be acidic and you may not want to add to
that. That's the one thing I have against purely organic methods of
control. Sometimes the approved organic compound lasts a lot longer
in the environment than a synthesized product. As a side note,
that's why I haven't tried Surround. I'm not very excited about
spraying an aluminum based product on the fruit. Mind you, I'm still
trying to stay as organic as possible, but I don't consider something safe
just because it's approved for organic use.
All the literature says bac. spot is extremely
hard to control and it is suggested that resistant varieties be planted
instead of spraying for it. Of course that doesn't help you with
your existing trees but it may be good to know if you plant
more. I believe commercial producers use spectromycin (sp?) Of
course you have the risk of antibiotic resistance buildup, but I think they
have to do it sometimes to get a sellable crop.
I may have read somewhere or sometime that
hydrogen peroxide was used to control bacterial cankers. I wonder if
it's bactericide properties would give some help against bac. spot.
Perhaps someone more knowledgeable than I could comment on this. I'm
just a novice trying to think out of the box. I have no idea what it
would do to the tree. My guess is it would be OK for the bark and
probably OK for young dormant shoots. You would definitely use it only
during the dormant period. Just an idea. Try it at your own
risk.
God bless,
Mark
Zone 5 Kansas
----- Original Message -----
Sent: Sunday, February 18, 2007 1:20
PM
Subject: [NAFEX] Organic solution to
bacterial spot
I need an
effective organic solution to bacterial spot for my backyard orchard. I have
read that cooper will work but I cannot find a formulation for backyard use
and have seen warnings about toxicity to foliage. Anyone know if a consumer
friendly solution? How do I carry out the cooper method?
Thanks.
Randy
Zone
6
NJ
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