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nafex - Re: [NAFEX] Spray Tank Residue

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  • From: "Ernest Plutko" <ernestplutko@wiktel.com>
  • To: nafex@lists.ibiblio.org
  • Subject: Re: [NAFEX] Spray Tank Residue
  • Date: Thu, 30 Jul 2009 05:12:12 -0500

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@comcast.net
To: nafex@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
>year
>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
>bottom
>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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