Ontario Sessional Papers, 1908, . r sometimes on the roots and stem. In theearly stages these knots are the same color as the roots, but as they maturethey become darker in color and rough and warty. They vary in size fromthat of a pigeons egg to bunches as large as ones fist. Towards the end ofthe season these galls decay and fall away, and are followed by new galls thesucceeding year on other portions of the roots. The plants affected with thedisease become spindly, stunted, and sickly and soon die. The cause of thedisease is an organism found in the tissue of the galls, belonging t
Ontario Sessional Papers, 1908, . r sometimes on the roots and stem. In theearly stages these knots are the same color as the roots, but as they maturethey become darker in color and rough and warty. They vary in size fromthat of a pigeons egg to bunches as large as ones fist. Towards the end ofthe season these galls decay and fall away, and are followed by new galls thesucceeding year on other portions of the roots. The plants affected with thedisease become spindly, stunted, and sickly and soon die. The cause of thedisease is an organism found in the tissue of the galls, belonging to theMyxomycetes or slime moulds. It is spread chiefly through the agency ofinfested nursery stock though there is evidence to show that it may spreadthrough the soil for limited distances. Treatment. The nature of the disease is such that no treatment can beapplied, hence prevention is the only source of relief. Affected trees shouldbe dug out and burnt and nursery stock carefully inspected before plantingand all diseased trees Pear Leaf Scald (Entomosporium maculatum) on Quince leaf. Pear Leaf Scald (Entoviosporium, maculatum). Leaves affected withthis disease were sent to the department by several fruit growers in theNiagara district, who reported that the foliage of their pear trees was badly 1907 AGRICULTURAL COLLEGE. 49 damaged by the disease. Leaf Scald is very common wherever pear trees aregrown and in some seasons causes considerable damage. The first indicationof this disease is the appearance of red spots on the upper surface of theleaves; these increase in size and number and become brown with one or moreblack dots towards the centre. The injured leaves usually become yellowand brown and fall from the trees. Thus in severe attacks the trees are de-foliated, the growth stopped, and the fruit severely injured. Generally asecond growth of leaves takes place, but these are too late to properly maturethe wood and hence the trees are very likely to suffer from
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