. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FOREST DISKASE SURVEYS. 19 of the various infections and to show therein the estimated cull due to each. This information can easily be secured by coobservation with the estimator, who can supply the actual figures for the rot percentages and aid in determining the boundary lines of infec- tion. This will produce sufficient reliable data upon which to base valuable pathological maps, which can be compiled either with col- ored areas to indicate the diseases and inclosed figures indicating the rot percentages or can be
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FOREST DISKASE SURVEYS. 19 of the various infections and to show therein the estimated cull due to each. This information can easily be secured by coobservation with the estimator, who can supply the actual figures for the rot percentages and aid in determining the boundary lines of infec- tion. This will produce sufficient reliable data upon which to base valuable pathological maps, which can be compiled either with col- ored areas to indicate the diseases and inclosed figures indicating the rot percentages or can be drawn in black and white, using lines dif-. Fig. 19.—Razoumofskya campylopoda, mistletoe, on yellow pine. fering from type lines to indicate the boundaries of the infected areas and placing the rot percentages in figures within this area. PATHOLOGICAL MAPS. Maps indicating the distribution of diseases in forest areas have not been used to any great extent. In German literature, articles are to be found dealing with plant diseases which have such maps illustrating the distribution of the disease. Very few contain maps dealing with the distribution of forest-tree diseases and none at all dealing strictly with the distribution of fungous infection in forests. In this country considerable use has been made of disease-distribu- tion maps by the various workers along the line of plant and forest. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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