[compost_tea] Re:phytopthora root ro

From: dloring3 <dloring3_at_cox.net>
Date: Tue, 21 Oct 2003 00:12:12 -0000

Kirk - That's Ro as in I can't type Ro. Anyway it's just a piece of
research from some Citrus people that I came across which names names
of microorganisms for those interested along with some other info.

No conspiracy here, I work with a non-profit. I am developing a
product though, an Active Organic Matter test kit, but it has nothing
to do with the citation or use of Gypsum that was mentioned. If
people on the list have talked about using Gypsum I didn't find it in
my search of the messages so I was asking to revisit the subject or
point me in the direction of such info.

Thanks,

Dave

--- In compost_tea_at_yahoogroups.com, "Kirk Leonard" <kirk_at_o...> wrote:
> Ro? Ro who? Ro wha? Much has been researched and written about
> vermicomposts dealing well with phytophthora, verticillia and
fusaria, too,
> and in my experience they can definitely do that and more, without
dolomite,
> super phosphates or gypsum. What's in between the lines here?
>
> > Date: Mon, 20 Oct 2003 02:15:34 -0000
> > From: "dloring3" <dloring3_at_c...>
> > Subject: phytopthora root ro
>
> > For anyone working on Phytopthora
>
> > Dave
>
> > Suppressive Soils
>
> > Much has been written about suppressive soils with respect to
avocado
> root rot (Borst, 1983; Broadbent and Baker, 1974;
>
> > Downer, 1998; Halsall, 1982, Ko and Shiroma, 1989; Pegg et al.,
1982;
> Turner and Menge, 1994). Avocado root rot
>
> > suppressive soils occur naturally. For example, natural rainforest
> habitats were suppressive to avocado root rot and a
>
> > complex method called the Ashburner method was created to
duplicate
> the suppressive rainforest soils (Broadbent and
>
> > Baker, 1974). The Ashburner method consisted of cover cropping,
> applications of manure, dolomite, and super-phosphate,
>
> > and the addition of organic matter. Today the method has been
> modified to provide only the key ingredients,
>
> > which are organic mulches and gypsum. High populations of bacteria
> and actinomycetes (Broadbent and Baker, 1974) or
>
> > cellulose and lignin degraders (Downer, 1998) are naturally
> stimulated to create the suppressive soils. As we learn more
>
> > about the factors that create suppressive soils, this term will
lose
> its mystique and we will speak of specific suppressive
>
> > factors. Certain bacteria, such as some species of Pseudomonas and
> Chromobacterium violaceum, are required to stimu-late
>
> > sporangial production of P. cinnamomi, while other bacteria are
> inhibitory (Erwin and Ribeiro, 1996; Zentmyer,
>
> > 1980). Specifically, microorganisms such as Myrothecium roridum,
> Trichoderma harzianum, Epiccocum purpurascens,
>
> > Catenaria anguillae, Humicola fuscoatra, Anguillospora
> pseudolongissma, Hypochytrium catenoides, Myrothecium ver-rucaria,
>
> > Streptomyces griseoalbus, Micromonospora carbonacea, Streptomyces
> violascens, and Ceraceomyces tessulatus
>
> > have been shown to be inhibitory to P. cinnamomi via competition,
> antibiosis, or parasitism (Downer, 1998, Erwin and
>
> > Ribeiro, 1996). The complex community structure of microorganisms
> like these is undoubtedly responsible for the fact
>
> > that some soils are suppressive while others are not. Zentmyer
(1980)
> draws attention to the fact that populations of P.
>
> > cinnamomi usually drop off dramatically after the first wave of
root
> rot occurs. He feels this may occur as parasites of P.
>
> > cinnamomi and other antagonistic microorganisms invade and make
the
> soil more suppressive. <
>
> Dave -- Huh? This feels like a walk in the weeds. Where are you
heading
> with this?
>
> Soils with healthy biological food webs and good organic content
seem a lot
> more attractive than suppresive soils, whatever they may be. High-
chem soils
> seem most suppresive to me.
>
> If you have a straightforward compost tea solution to "P" root rot,
which I
> take to be phytophthora, why don't you just say so, less dolomite,
> phosphates and gypsum?
>
> -- Kirk L
> 15 gal .5 a/w homebuilt ACT and 5 gal modified bioblender nutrient
tea
> machines...


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Received on Mon Oct 20 2003 - 23:10:13 EDT

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