[NAFEX] Spray Tank Residue

dmnorton at royaloakfarmorchard.com dmnorton at royaloakfarmorchard.com
Thu Jul 30 14:07:02 EDT 2009


In years past, our mix of Captan 50WP, Imidan  70W and Calcium w/sticker 
spreader never had any issues. Our Calcium was granular and not liquid.   It 
is important to put Captan in the tank first and make sure it is fully mixed 
BEFORE adding any other product.  You also cannot mix Captan with any 
emulsifiable liquid.  Not knowing what spreader/sticker you used....if it 
has any emulsifiers in it...that was your problem.  If the liquid Calcium 
was an emlsifiable concentrated liquid formulation then it would not allow 
the Captan to completely mix and the Captan would settle to the bottom of 
the tank and that was the problem.  Hope this helps!

Dennis Norton
Royal Oak Farm Orchard
Office (815) 648-4467
Mobile (815) 228-2174
Fax (609) 228-2174
----- Original Message ----- 
From: "sherwin dubren" <sherwindu at comcast.net>
To: <nafex at lists.ibiblio.org>
Sent: Thursday, July 30, 2009 2:15 AM
Subject: [NAFEX] Spray Tank Residue

> 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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