Copper oxysulfate product is manufactured by partially acidulating copper oxide with sulfuric acid. It is suitable for dry application to the soil only, either on its own or in blends.
On application of the granules to the soil, the copper sulfate dissolves, releasing fine particles of insoluble copper oxide. As copper oxysulfate is not fully soluble, it cannot be used in foliar sprays.
I foliar spray with chlorothalonil (Daconil 2787®) and believe it to work much more effectively than any copper-based product. :wink:
__________________
Mischka
One last word of farewell, Dear Master and Mistress.
Whenever you visit my grave,
say to yourselves with regret
but also with happiness in your hearts
at the remembrance of my long happy life with you:
"Here lies one who loved us and whom we loved."
No matter how deep my sleep I shall hear you,
and not all the power of death
can keep my spirit
from wagging a grateful tail.
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