. Chestnut blight. Chestnut blight; Chestnut. 8 CONTEOL OF THE CHESTNUT BAKK DISEASE. bark itself, but the pustules show in the cracks and the bark often sounds hollow when tapped. After smooth-barked limbs or trunks are <rirdled the fungus continues to grow extensively through the barkt sometimes covering the entire surface with reddish-brown pustules (fig. 4). These pustules produce mostly winter spores (ascospores)'^ although occasionally the long strings of summer spores (fig. 3) are also produced, even on bark that has been dead at least a Fig. 4.—Dead chestnut bark showing pust
. Chestnut blight. Chestnut blight; Chestnut. 8 CONTEOL OF THE CHESTNUT BAKK DISEASE. bark itself, but the pustules show in the cracks and the bark often sounds hollow when tapped. After smooth-barked limbs or trunks are <rirdled the fungus continues to grow extensively through the barkt sometimes covering the entire surface with reddish-brown pustules (fig. 4). These pustules produce mostly winter spores (ascospores)'^ although occasionally the long strings of summer spores (fig. 3) are also produced, even on bark that has been dead at least a Fig. 4.—Dead chestnut bark showing pustules of the parasitic fungus bearing winter spores. After a branch or trunk is girdled, the leaves change color and sooner or later wither. Such branches have a veiy characteristic appearance and can hardly be mistaken for anj^thing else, except in certain localities \\here the work of twig-girdling insects may pro- duce a similar ajipearance in the spring. In case the girdling by the fungus is completed late in the season, the leaves of the follow- ing sjoring assume a yellowish or pale appearance and do not develop to their full size (fig. 2). If the girdling is completed between spring and midsuiiuner the leaves may attain their full size and then turn 407. 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 1906-1960
Size: 1791px × 1395px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcollectionbiodiversity, bookleafn, booksubjectchestnutblight
