[NAFEX] Leftover spray

Mark Angermayer hangermayer at isp.com
Sun Jun 7 20:29:13 EDT 2009


Karen,

It depends on the pH of the spray solution.  Captan and Imidan are among the
worst to degrade rapidly under high pH conditions.  Most water supplies are
alkaline.

At a pH of 8 Captan has a half-life of 10 minutes.  If you buffer the water
to a 5 pH, it's half-life is 32 hours.

Imidan has a half-life of 4 hours at 8 pH, and 13 days at 4.5 pH.


Additionally certain minerals in the water will tie up certain pesticides,
rendering them less effective.

http://extension.usu.edu/files/publications/factsheet/AG_Pesticides_14.pdf

Mark
KS


----- Original Message ----- 
From: "akmanty" <>
To: <nafex at lists.ibiblio.org>
Sent: Sunday, June 07, 2009 6:55 PM
Subject: [NAFEX] Leftover spray


> Storing/keeping leftover spray, as Captan and Imidan:
>
> How long can one keep these sprays if you mixed too much, or
> conditions changed, as got too windy to apply?
> Few hours, days??  Longer??
> Karen   WI
>
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