RE: [compost_tea] Re: blackspot vrs sooty mold

From: George and Paulette Mouchet <geomouchet_at_QNET.COM>
Date: Sat, 7 Jun 2003 11:05:00 -0700

Want to make a clarification here. There is a difference between blackspot
on roses and black, sooty mold.

Blackspot makes black spots that have feathery edges. As the spot gets
bigger, there is usually a brown circle of dead leaf in the center.

Sooty mold is also black. In this case you'll have black powdery stuff on
the leaves that is like fine flour. There won't be a circle of dead tissue
in the center. Per the name, it's a mold, not a fungus. Black sooty mold
usually appears after aphids have damaged the leaves. The mold is
attracted to the sweet plant sap (honeydew) and move in to feast.

Ladybugs and green lacewings are excellent aphid controls. Also, many
small birds such as finches, will eat aphids. I don't know if, or how (Dr.
E, care to explain here?), AACT would prevent aphids.

AACT should work well to displace any mold spores.

Paulette


-----Original Message-----
From: soilfoodweb_at_aol.com [SMTP:soilfoodweb_at_aol.com]
Sent: Saturday, June 07, 2003 9:06 AM
To: compost_tea_at_yahoogroups.com
Subject: [compost_tea] Re: blackspot

It is easy to protect your leaves from the fungus that causes black-spot.
 Paulette is correct in pointing out that it is the spores of the fungus
that are black. The initial infection is just vaguely gray, as the fungal
hyphae start growing on the leaf surface. As the hyphae mature, spores are
formed. The spores are black. The spot gets larger as the fungus grows
outward.

The main agent of protection seems to be coverage. If some organism is
already present on the leaf surface, the black spot fungus cannot push
someone else out of the spot. The enzymatic ability of the black-spot
fungi is so weak that it cannot outcompete any other critter. So why is
black-spot so prevalent? We do things all the time to destroy the biology
on the surfaces of leaves......

Get the organisms back on your leaf surfaces, and then stop killing them.
 Get your neighbors to stop doing things that kill the healthy set of
organisms on the leaf surfaces.

Elaine Ingham
President, Soil Foodweb Inc.
SFI Corvallis, OR
SFI Port Jefferson, NY
SFI Lismore, NSW, Australia
SFI Hilversum, The Netherlands
SFI Cambridge, New Zealand
www.soilfoodweb.com


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Received on Sat Jun 07 2003 - 15:33:39 EDT

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