. The Canadian horticulturist [monthly], 1901. Gardening; Canadian periodicals. MERICAN APPLE CANKER {Spha- ^^ eropsis malorum.—The popular edi- 6S tion of Bulletin 185, Geneva, New ^^^r York, is devoted to this subject. The disease has become very prevalent in Nova Scotia and not infrequent in Ontario, where it has been attributed to sun-scald, frost, etc., when in fact it is a fungus growth. It is therefore in place to give the following extract : "To cause the destruc- tion of cankers which girdle the limbs, the germs of the disease must get through the tough outer layer of the bark in
. The Canadian horticulturist [monthly], 1901. Gardening; Canadian periodicals. MERICAN APPLE CANKER {Spha- ^^ eropsis malorum.—The popular edi- 6S tion of Bulletin 185, Geneva, New ^^^r York, is devoted to this subject. The disease has become very prevalent in Nova Scotia and not infrequent in Ontario, where it has been attributed to sun-scald, frost, etc., when in fact it is a fungus growth. It is therefore in place to give the following extract : "To cause the destruc- tion of cankers which girdle the limbs, the germs of the disease must get through the tough outer layer of the bark into the growing layer beneath, the cambium. An injury to the bark of some sort is necessary to this entrance; for the fungous threads can not penetrate the unbroken bark. Sun- scald, as well as mechanical abrasions, may cause such injuries. The bark is killed by the sun and frost, and cracks or peels, when the germ finds ready entrance and rapidly extends the in- injured area in canker form. Sunscald or sunburn is a common trouble in this state, probably more com- mon than generally sup- FiG. 2127. posed, especially on tender American Apple varieties. The long areas of reddish bark on the south and southwest sides of limbs and young trunks are inconspicuous when they first are scalded and so escape notice ; but they are all too common, and may be-. come the seat of serious harm to the trees. Trees of tender varieties should be protected from the direct rays of the sun by training them to low, thick heads which shade both trunks and branches. Additional protection may be given by a coat of whitewash upon the trunks ; which helps to prevent absorp- tion of the sun's rays and also exerts a favorable influence upon the bark itself. A good mixture is : Lime (unslaked) 30 lbs. Tallow 4 " 5 " Dilute with water enough to make i spray easily. Treatment of —^In addition to the protection from sunscald, thorough spraying. Please note that these images are ext
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