. Better fruit. Fruit-culture. 1914 BETTER FRUIT Page 13. The Battle of Cider Mill Ridj (Courtesy of tlie SpokecmaD-Review) Some Factors in the Control of Pear Blight By P. J. OTiaia, Chief in Charge of Agr THE interesting subject of pear blight and its control has been so frequently discussed before the meetings of the various horticultural organizations of the Pacific Coast and Pacific Northwest that I take it for granted that practically every grower of pome fruits fully understands the nature of this disease, which should be properly termed the Bacterial Blight of Pome F'ruits. Besides att
. Better fruit. Fruit-culture. 1914 BETTER FRUIT Page 13. The Battle of Cider Mill Ridj (Courtesy of tlie SpokecmaD-Review) Some Factors in the Control of Pear Blight By P. J. OTiaia, Chief in Charge of Agr THE interesting subject of pear blight and its control has been so frequently discussed before the meetings of the various horticultural organizations of the Pacific Coast and Pacific Northwest that I take it for granted that practically every grower of pome fruits fully understands the nature of this disease, which should be properly termed the Bacterial Blight of Pome F'ruits. Besides attacking all pome fruits in a more or less serious manner, the bacterial organism of pear blight also attacks, in a limited way, various members of the stone-fruit family. I take it for granted that the fruitgrowers who have heard the sub- ject of pear blight frequently dis- cussed know of its early history and native origin, namely, that it is a strictly North American disease anil was first noted on the highlands of the Hudson, New York, by William Den- ning in 1780. Until a few years ago the disease was confined to the North American continent, but it is now icullural Investigations, American Snicltin known in two or three parts of Europe, having been noted as occurring there by certain agricultural explorers of the United States Department of Agricul- ture. However, from all accounts of its occurrences in Europe we are led to believe that it has not as yet be- come a serious menace to fruitgrowers. With this introduction, we will pro- ceed to discuss some of the important factors in the control of a disease which in many ways is more de- structive than all the other diseases which the fruitgrower must combat. Cause of Serious Infection.—In order to have a serious i)ear-blight epidemic the following conditions are neces- sary: (1) The germ must be present: (2) insect or other agencies for the "sowing" or spread of the blight or- ganism must he plentiful and active;
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