Excerpt from The Influence of Copper Sprays on the Yield and Composition of Irish Potato Tubers

In 1912 Lutman published data from Vermont showing that a greater yield of tubers was obtained from copper - sprayed potato plants at various stages of growth than from the unsprayed plants. Plants which received a Pickering spray, a Bordeaux spray in which part of the copper sulphate had been replaced by iron sulphate, and a commercial Spray containing copper also gave higher yields than the check plants. The increased yield seemed to be in proportion to the amount of copper present in the Spray. The application of a spray containing silver did not increase the yield. Lutman gested that the Bordeaux mixture acts as a stimulant, bringing about an increase in the quantity of starch produced daily.

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