. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 32 Prevention. Cut out and burn the knots, taking care to cut well below the diseased area. This should be thoroughly done at least twice a year, in the fall or early winter and in late spring. Spray plums and cherries as recommended for Brown Rot. The early dormant wood spray with concentrated lime-sulphur, strength specific gravity or appears to be particularly effective in the prevention of Black K
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 32 Prevention. Cut out and burn the knots, taking care to cut well below the diseased area. This should be thoroughly done at least twice a year, in the fall or early winter and in late spring. Spray plums and cherries as recommended for Brown Rot. The early dormant wood spray with concentrated lime-sulphur, strength specific gravity or appears to be particularly effective in the prevention of Black Knot, and care should be taken to se- that it is very thoroughly applied. The branches, main limbs and trunks should o completely covered with the solution. Black Knot attacks wild cherries and plums, and there is a possibility of its spreading from these to those under cultivation. It is advisable, therefore, to destroy wild plums and cherries in the neighbourhood of the orchard if they are affected with Black Knot. The enforcement of the clauses of the " Fruit Pests Act," regarding the cutting out of Black Knot, should make it much easier for fruit growers to keep Knot out of their orchards. Pli'm Pockets (Bladder Plums) (Eroascus pruni). This disease is common in Ontario on wild plums and on cultivated plums of the American varieties (Prunns amertcana). It is recorded also as sometimes. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Howitt, J. E. (John Eaton), 1880-1966; Caesar, Lawson, 1870-1952; Ontario. Dept. of Agriculture. Toronto : Dept. of Agriculture
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