The chestnut bark disease . rk disease and some good results have been secured. Thosemost actively engaged in work along this line at present arethe Pennsylvania Chestnut Tree Blight Commission and theOffice of Forest Pathology in the U. S. Department of Agri-culture. Spraying appears to be of little value, and, of course, isentirely impractical in forest areas. The method which hasfinally been adopted aims to prevent the further spread ofthe disease from the area of general infection and to destroyall diseased trees outside this area. To accomplish the firstpoint, it is essential to establish
The chestnut bark disease . rk disease and some good results have been secured. Thosemost actively engaged in work along this line at present arethe Pennsylvania Chestnut Tree Blight Commission and theOffice of Forest Pathology in the U. S. Department of Agri-culture. Spraying appears to be of little value, and, of course, isentirely impractical in forest areas. The method which hasfinally been adopted aims to prevent the further spread ofthe disease from the area of general infection and to destroyall diseased trees outside this area. To accomplish the firstpoint, it is essential to establish a line beyond which it willbe extremely difficult for the disease to progress. The main,advancing front of the diseased section must come to a pointwhere there are no more chestnut trees within easy range ofinfection. Large unwooded areas and forest tracts free fromchestnut should form as large a part of this boundary line as (1) From unpublished data furnished by Dr. Spaulding. March, 1912.] THE CHESTNUT BARK DISEASE. 221. FtG. 11.—Note sprout production ar(iund base of this diseased tree. 222 W. V. AGR. EXPERIMENT STATION [Bulletin 137 practicable. In other portions it may be necessary to cut allchestnut trees both healthy and diseased, in a belt some mileswide along the line. The disease is left largely to itself inthe area enclosed by this line while careful search is made forall diseased trees outside that area and they are destroyedwhen found. All chestnut timber in the generally diseasedarea should be cut and utilized as rapidly as possible but thedisease will find itself checked upon reaching a boundry de-stitute of chestnut,—the same as a forest fire when it comesto a broad river. In the case of individual trees which are quite valuable itis often possible to prolong their lives or even to save themby careful tree surgery. Diseased twigs and small limbsshould be removed. The larger limbs and trunk may betreated by carefully cutting away all diseased bark and intot
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