. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. STRAWBERRY DISEASES 1933 STRAWBERRY DISEASES Antliracnose Gloeosporium fragariae Mont. According to C. L. Shear, pathologist of the Bureau of Plant Industry, United States Department of Agriculture, this disease does not occur in America. Black Heart or Frost Injury The cultivated varieties of strawberries and raspberries are more or less subject
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. STRAWBERRY DISEASES 1933 STRAWBERRY DISEASES Antliracnose Gloeosporium fragariae Mont. According to C. L. Shear, pathologist of the Bureau of Plant Industry, United States Department of Agriculture, this disease does not occur in America. Black Heart or Frost Injury The cultivated varieties of strawberries and raspberries are more or less subject to frost injury, which manifests itself by producing a blackened center in these flowers. In severe cases, all flowers form- ing a cluster may be found affected, espe- cially in varieties where most of the blos- soms open at one time. Night frosts are capable of great injury by destroying the styles of the flowers and thus preventing the fruit from being formed. In some instances, a few styles only may be killed and the result will be a crippled, mal- formed fruit, which does not recommend itself by its appearance to the buyer. It has been found, especially in the case of strawberries, that the injury may be largely prevented by covering all early- flowering varieties at night with straw or loose litter of some kind. The harvest may thus often be increased from 10 to 20 per cent and more. Raspberries may be planted between sheltering hedges, or they may be covered over night with cheesecloth. Where these suggestions may not be practicable, spraying with cold water early in the morning before the rays of the sun take effect has been proved a useful preventive. The lighting of smudge fires and keep- ing them alive throughout cold nights has also proved quite successful. H. T. Gussow, Experiment Farms Reports, 1911. Black Root A rather indefinite trouble, character- ized by the blackening and ultimate decay of the roots of plants during the second year after setting. It usually s
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