. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 31 toJ^eir prerention «nd control: Bemoval of the dead twigs from the main limb., since It u found that these twigs are the starting point of the disease in such a large number of cases; destruction of Brown Rot mummies; painting of aU the Urger pruning wounds; remoTal of small limbs showing cankers, and the treatment of cankers on trunk or large limbs by cleaning out the cankers immediately after rain when the b
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 31 toJ^eir prerention «nd control: Bemoval of the dead twigs from the main limb., since It u found that these twigs are the starting point of the disease in such a large number of cases; destruction of Brown Rot mummies; painting of aU the Urger pruning wounds; remoTal of small limbs showing cankers, and the treatment of cankers on trunk or large limbs by cleaning out the cankers immediately after rain when the bark and gum are soft, and disinfecting the wounds with formalin diluted one to ten or corrosive sublimate, one in a thousand, and coating them with lead paint free from turpentine. The field observations of the writers recorded above indicate that care should !!+w /*? to over-prune or over-fertilize peach trees, as such treatment appar- ently tends to induce the formation of cankers. 1 Black Knot of Plums and Chebbies (Plowrightia morbosa (Shw.) Sacc). .ru. .'';^"_'» "» e^i^raely destructive disease, and in localities in Ontario where no special efforts have been made to control it, it has destroyed numerous cherry and plum trees. In well-cared-for orchards, it is kept under control and seldom causes serious injury. This is particularly true of orchards in the fruit-growing sections where spraying is generally practised and where the law requiring the cutting out of Black Knot is enforced. Symptoms. The knots usually appear first in the spring of the year. The swellings are at the start slight, but gradually increase in size. The surface becomes cracked and covered with a light green coating consisting of numerous fungus threads (mycelium) and spores. The swellings are often spindle^haped and usually confined more or less to one side of tiie twig. Later in the season, as the knots mature, they lose their green colour and become dry, hard, black and cracked, with t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsprayinganddustingin
