. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 12 linseed oil without turpentine. White lead checks and cracks, and if it is used the wounds will have to be painted over two or three times. Coal tar does not check or crack, but slightly discolours the bark around the edges of the wound? The writers, however, have never noticed any serious injury to the bark from the use of ooal tar on apple trees. Badly cankered trees, whifh would be dead in a year or two if
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. 12 linseed oil without turpentine. White lead checks and cracks, and if it is used the wounds will have to be painted over two or three times. Coal tar does not check or crack, but slightly discolours the bark around the edges of the wound? The writers, however, have never noticed any serious injury to the bark from the use of ooal tar on apple trees. Badly cankered trees, whifh would be dead in a year or two if neglected, can in many cases be saved by cutting and treating the cankers as described above. In pruning it is often advisable to cut out and bum large limbs which are badly cankered, if this can be done without causing too much injury to the tree. Sometimes, when it is necessary to remove a badly cankered main limb, a sucker nearby can be left to grow and take its place. Proper spraying is also of importance in controlling this disease. Spray at the regular times indi- cated in the Spray Calendar for the apple. The first or so-called dormant wood spray with concentrated lime-sulphur, specific gravity to (=1 gallon to 7 to 9 gallons of water), is especially important in the prevention of cankers, and care should be taken to see that the trunk and main limbs are all thoroughly covered at this time. This application, combined with the other sprayings when the trees are in leaf, will completely prevent the spotting of the Sooty Blotch and Fly Speck {Leptothyrium pomi, Mont. & Ft. Sacc). This disease frequently disfigures apples, and by so doing much reduces their market value. It does not usually appear until late summer or early fall, and only becomes prevalent enough to cause serious disfigurement of the fruit when the weather is specially damp at this time of the year. Symptoms. This disease is easily recognized by the character- istic irregular sooty
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