Most pesticides (insecticides, fungicides, PGRs, and herbicides) are stable at the neutral point pH 7.0 or better yet at a slightly acidic level of 6.5. Ideally spray tank water should be in a range between 6.5 to 7.5 pH. Unfortunately many growers are faced with water having pH of 8.0 and above, the result of higher alkalinity levels. A good example of this is Floramite, this excellent miticide works very well at a pH solution of 6.5 but if used in a pH solution of 7.5 or higher, mite control can be significantly reduced. Some products need no adjuvant as they may already contain good wetting agents or acidifying materials, e.g. B-Nine WSG.
There are many adjuvants on the market for adjusting or buffering the pH of the final spray tank mix. It is important for growers to understand the pesticide they are using and the pH of the water used for spraying. For information on the stability of OHP products please refer to the chart below.
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