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nafex - [NAFEX] Ph of water used in spraying

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  • From: "Rodney" <reveland@collinscom.net>
  • To: <nafex@lists.ibiblio.org>
  • Subject: [NAFEX] Ph of water used in spraying
  • Date: Wed, 15 Feb 2006 07:49:16 -0700

I came across this website quite by accident.

http://scarab.msu.montana.edu/extension/MT_PAT/Info/watereffects.htm

Here is an interesting excerpt:


As a general rule of thumb, the ideal pH for water used in spraying pesticides is slightly acidic (pH 4 -6). However, there are always exceptions. Make sure to read the label of the pesticide you intend to use as there are always some exceptions. For example, some herbicides have been known to break down in a sprayer tank when the pH is too acidic (pH less than 7). The sulfonylureas such as Ally, Escort, Amber, Harmony Extra, Express, and Accent may inactivate if left in the sprayer tank mixed in acidic water. Higher temperatures will also cause these herbicides to inactivate at a higher rate.

Insecticides and fungicides, on the other hand, have been shown to break down in water that has a high pH (alkaline). This means that an insecticide begins to break down once mixed with high pH water in the sprayer tank. Fungicides such as Benlate, Bravo and Captan can also inactivate quickly if left in the spray tank in an alkaline water source


This might explain why some folks get very different results than others when using the same product. I never paid attention to the labels to see the part about the ph of water. Did you?

Rodney Eveland

Northeast Wyoming






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