. Fig. 191. â Map showing the distribution of the chestnut bark disease: black shows area of severe infection ; round dots, presence of disease prior to 1909 ; + indicates â * the spread of the disease during 1909. After Metcalf. .jhe opposite side of branch, thus girdling the twig. Dead, Jiscolored, sunken patches with numerous yellow, orange, or reddish-brown pustules are produced; spores are extruded in greenish or yellow horns. The appearance of the fun- gus upon the trunk indicates speedy death, but if small branches are first diseased, the tree may live for a few years.

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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910