. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. ^ 2!) folded lengthwise and covered with a dense powdery white substance, whieli ex- tends over unto the twigs on which the leaves are borne. Tiie Mildew is easily recognized by this dense white powdery covering on the affected leaves and shoots'. It develops most vigorously in warm, moist weather, and is usualiv most abundant in late sunnner and autumn. Prevention. At the first sign of the Mildew, dust with flo
. The more important fruit tree diseases of Ontario [microform]. Fruit; Pulvérisation et poudrage en agriculture; Spraying and dusting in agriculture; Fruits; Exploitations agricoles. ^ 2!) folded lengthwise and covered with a dense powdery white substance, whieli ex- tends over unto the twigs on which the leaves are borne. Tiie Mildew is easily recognized by this dense white powdery covering on the affected leaves and shoots'. It develops most vigorously in warm, moist weather, and is usualiv most abundant in late sunnner and autumn. Prevention. At the first sign of the Mildew, dust with flowers of sulpliur and repat at intervals of ten days as often as may be required to bold tlie disease in 'â ' 'â Spraying with self-lroilcd lime-sulphur is also reiomniended. It is some- check. times advisable to discard very susceptible varieties Gam, {Psendomonm tumefaciens (Erw.) Smith d- Tmrnsend). Til is is a bacterial disease which affects peaches, apples, plums, cherries, rasp- l)erries and many other plants. It is easily recognized by the woody, knot-like swellings seen on the trunk and roots. Th. s-^ galls vary in size. Some are not as large as a walnut, while soiiio may bo as large or much larger than a man's ; 'WTien these galls arc on the trunk flioy are usually at or just below the ground. The extent of injtiry done to the tree by Crown (Jail is an open question. Many affeoted trees continue to grow and appear to thrive normally. There is no doubt, however, that some trees are weakened and stunted, if not killed by the presence of the galls. Hairy Root of apples, often seen in nurserv stock and easiiv recognized by the tufts of thread-like rootlets replacing the branches on the main root, is caused by the same organism. Prevention. In order to be on the safe sid(> do not plant any trees showing anv indication ol Crown Gall. Such trees should'be returned to the nurseryman with a request for healthy trees to take their place. It is not advisabl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsprayinganddustingin
