----- Original Message -----
Sent: Thursday, April 17, 2003 10:13
PM
Subject: Re: [compost_tea] CT effect on
wine
Anthony,
We have very little problem with mites, there are predatory
mites that will control the bud mites etc. Interesting to note that using CT
in preferance to sulphur will tend to encourage predatory mite populations as
the sulphur will kill most of these organisms (the exception is
Typhlodromus doreenae).
The predatory mite Amblyseius
victoria is susceptible to sulphur
sprays.
Lace wings and lady birds also predate mites
so eliminating pesticides will encourage natural control of these
organisms. As you would know as you get plant sap brix to a true brix of 12 or
above and pH nearer 6.4 pests such as these become negligible.
Interesting to note that the folia analysis for the CT
treated vines showed good levels of Ca and we were able to use folia sprays
(phos acid and humics) that raised brix by up to 2 degrees. It may be
that the CT was helping to improve Ca levels and thus folia sprays were more
effective?? No data to prove or disprove just a theory at the
moment.
Glad to hear you are monitoring using Reams approach have
you been able to measure brix improvements using CT? I have measured small
movements upwards using CT in other crops but have not measured it in grapes
after using CT?
Once mineral balance occurs in the vines
everything becomes easy and yes it will affect CT performance.
However you can have all the right minerals in the soil in the right ratio and
balance etc but if the biology is out of balance (bacterial to fungal etc)
then it will not work. So we need both soil chemistry and biology (and
physics) to be functioning as they were designed to in the soil.
Regards Mike Harvey
----- Original Message -----
Sent: Thursday, April 17, 2003 9:20
AM
Subject: Re: [compost_tea] CT effect on
wine
Thanks Mike
i think mineral balance in the soil has alot to do with
the efficacy of CT on foliar disease suppression. I have achieved some good
Rheams numbers in my vineyard and results speak for themselves.
what about mites?. Do you think early inoculation with CT
in the vineyard can out compete rust mite on the leaf surface. pathogens
such as the powderys' and botrytis are in the order of a few micrometers,
surely these mites must be in the order of a few hundred micrometers (or
more). i cant see any of the suite of microbes munching down on a mite, so
is it competition for space in this situation as opposed to eating each
other. rather analogous to a david and goliath scenario dont you
think?
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