. Better fruit. Fruit-culture. BETTER FRUIT An Illustrated Magazine Devoted to the Interests of Modern Progressive Fruit Growing and Marketing Entered as second-class matter April 22, 1918, at the Postoffice at Portland, Oregon, under act of Congress of March 3, 1879 Volume XV Portland, Oregon, April, 1921 Number 10 Controlling Brown Rot of Stone Fruits By D. F. Fisher, Pathologist, Fruit Disease Investigations, U. S. Department of Agriculture ONE of the most serions menaces to the crop of stone fruits in the humid sections of the Pacific Northwest is the disease called brown rot, and caused b
. Better fruit. Fruit-culture. BETTER FRUIT An Illustrated Magazine Devoted to the Interests of Modern Progressive Fruit Growing and Marketing Entered as second-class matter April 22, 1918, at the Postoffice at Portland, Oregon, under act of Congress of March 3, 1879 Volume XV Portland, Oregon, April, 1921 Number 10 Controlling Brown Rot of Stone Fruits By D. F. Fisher, Pathologist, Fruit Disease Investigations, U. S. Department of Agriculture ONE of the most serions menaces to the crop of stone fruits in the humid sections of the Pacific Northwest is the disease called brown rot, and caused by a fungus technically known as Sclerotinia Cinerea (Bon.) Wor. Most orchardists are familiar with its attacks on the ripening fruit, but few appreciate its significance at other seasons, such as the rot of immature fruit, twig and limb cankers, and par- ticularly as a "blossom blight," which prevents the setting of a crop. Fewer still understand important facts in the life history of the fungus which have a bearing on control methods. Since brown rot generally accompanies a period of rainy weather, the manifestation of the disease, both on blossoms and fruit, is frequently regarded as "just rot," or an unavoidable result of climatic condi- tions. Wet weather is essential to the growth and dissemination of the fungus and the spread of the disease, but is not otherwise concerned in the damage, ex- cept as it may hinder control methods, such as early spring cultivation or spraying. Life History of the Fungus SINCE most people are more familiar with its occurrence on the ripe fruit (fig. 1), this stage will be a convenient one from which to start an account of the life history of the fungus. There is never difficulty in finding plenty of fruit destroyed by brown rot during the ripening season of cherries, prunes, and other stone fruits in the humid sections west of the Cascades, and if there hap- pens to be a rainy period at this time a large proportion of the
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