The matter of using fungicides to prevent certain parasitic diseases of plants is no longer a theory. Experiments made in many parts of this country and Europe show that diseases like Apple Scab, Leaf-spot Disease of the Cherry; Powdery Mildew, Strawberry Leaf-blight, Black Rot of Grapes; Potato Rot, and others are amenable to treatment.

There is still much to be learned about spraying, especially plants placed under different conditions. The following experiments were made during the season of 1891.