Black Knot

The fungus is also related to the black-knot fungus on the plum, but its life-history is not yet known. ❋ Unknown (N/A)

In a well kept and well sprayed orchard black-knot is not at all likely to appear. ❋ Unknown (1930)

Also examine plum and cherry trees for black-knot. ❋ Unknown (1930)

The civic nature of these problems is appreciated when we realize that it would do little good, for example, for one person to destroy the breeding-places of mosquitoes on his premises, if his neighbors did not do likewise about their homes; or for one orchardist to cut out the blight from his pear-trees or the black-knot from his plum-trees, if his neighbors did not co-operate with him by ridding their orchards of these diseases. ❋ Girl Scouts Of The United States Of America (1918)

Do not let the cabbage club-root disease breed on wild turnips and other mustards, or black-knot on plum sprouts and wild cherries, or tent-caterpillars on wild cherries and other trees. ❋ Unknown (1906)

There are four leading difficulties in the growing of plums -- leaf-blight, fruit-rot, black-knot, and curculio. ❋ Unknown (1906)

The black-knot is best kept in check by cutting out the knots whenever they can be seen, and burning them. ❋ Unknown (1906)

Orchards that are thoroughly sprayed with bordeaux mixture for the leaf-blight and fruit-rot fungus are less liable to attacks of black-knot. ❋ Unknown (1906)

The branches are very liable to disfigurement by the black-knot and the foliage by the tent-caterpillar. ❋ Lorin Low Dame (1860)