[NAFEX] Spray Tank Residue

Ernest Plutko ernestplutko at wiktel.com
Thu Jul 30 06:12:12 EDT 2009

Many calcium compounds are insoluble in water.  You are probably
having chemical reactions in you sprayer and precipitating out
insoluble who knows what.

---- Original Message ----
From: sherwindu at comcast.net
To: nafex at lists.ibiblio.org
Subject: RE: [NAFEX] Spray Tank Residue
Date: Thu, 30 Jul 2009 02:15:22 -0500

>We have been spraying our fruit trees for over 20 years, but this
>there is more residue at the bottom of our 2 gallon tank than we can
>remember.  Our mixture has usually been wettable powder Imidan and
>Captan.  We also add a sticker.  This year we introduced a calcium
>liquod, which is reported as compatible with other chemicals.  What
>we are seeing is a light brown sludge, about a half cup, at the
>of the tank after using up the spray liquid.
>My concerns are twofold.  Firstly, that this problem is contributing
>to the problem of clogging up the spray nozzle, although we can
>usually go through one full tank before it needs a cleaning.
>The second concern is what exactly is precipitating out of the
>spray solution.  If it is one or more of the chemicals, does that
>mean that the full dose of chemicals is not making out the nozzle?
>We occasionally alternate our sprays with a general orchard spray
>from Bonide, and that doesn't seem to have this problem.  The
>chemicals are measured out carefully and hopefully accurately.
>We have mostly apple trees, but some peaches, plums, apricots,
>and sour cherries.
>Any thoughts on this?
>                          Sherwin in zone 5
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