. Manual of tree diseases . Trees. 276 MANUAL OF TREE DISEASES rant or goosebeny bushes In order to continue the cycle of de- velopment. Spores are then produced throughout the summer on these plants which cause the infection of other goose- berries and currants. In the autumn another type of spores (teliospores) is developed on the affected currants and gooseberries and from these are formed basidiospores which cause the infection of the young branches of five-needled pines. The distribution of this fungus on the pines, therefore, is dependent on the presence or absence of gooseberries and cu
. Manual of tree diseases . Trees. 276 MANUAL OF TREE DISEASES rant or goosebeny bushes In order to continue the cycle of de- velopment. Spores are then produced throughout the summer on these plants which cause the infection of other goose- berries and currants. In the autumn another type of spores (teliospores) is developed on the affected currants and gooseberries and from these are formed basidiospores which cause the infection of the young branches of five-needled pines. The distribution of this fungus on the pines, therefore, is dependent on the presence or absence of gooseberries and currants, and if present the amount of damage done is somewhat dependent on their abundance. Unfortimately sev- eral species of these plants occur as common weeds practically throughout the range of the five-needle pines in the United States. Symptojns. The young leaf-bearing twigs are in- fected and the mycelium grows in the bark and may extend into the larger branches and trunks. The affected bark is usually swollen^ but the tissue remains normal and healthy in appearance for two or three years. In the second or third spring after infection occurs, the prominent fruiting-pustules of the fungus appear on the bark (Figs. 52 and 53). These blister-like pustules are irregularly Rg. hemispherical or elongate, one-eighth to twig of white pine. one-half inch across and 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 Rankin, W. Howard (William Howard), b. 1888. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
