. Fie. 196.—Caeoma piniiorquum. Section showing four pycnidia, from one of which (.tp) numerr)us conidia are being disch;irged. Cfnom/i-TpMches are developing beneath tlic cortical layer, as yet unbroken. (After R. Hartig.) occur in large numbers, an early fall of the leaf may result. The teleutospores hibernate in dead leaves on the ground. In spring the sporidia germinate and infect young shoots of Pinus sylvcstris, producing the disease known as Caeoma j^initcn'quvm} This disease attacks pine-seedlings, appearing generally on the needles. It is most frequent in plantations from one to ten y
. Fie. 196.—Caeoma piniiorquum. Section showing four pycnidia, from one of which (.tp) numerr)us conidia are being disch;irged. Cfnom/i-TpMches are developing beneath tlic cortical layer, as yet unbroken. (After R. Hartig.) occur in large numbers, an early fall of the leaf may result. The teleutospores hibernate in dead leaves on the ground. In spring the sporidia germinate and infect young shoots of Pinus sylvcstris, producing the disease known as Caeoma j^initcn'quvm} This disease attacks pine-seedlings, appearing generally on the needles. It is most frequent in plantations from one to ten years old, rarer in those of ten to thirty years, and not as yet observed in older. Finals sylvcstris is most commonly attacked, but it has also been observed on Pimis montana in Jutland. After formation of the C«fowff-patches, the young thin shoots generally die off, but thicker ones become twisted at the place attacked, whence the name " pine-twister " commonly given to this disease. If the leading shoot be attacked, the seedlings may succumb altogether. The disease develops rapidly, ^ R. Hartig, Wichtuje Krankhdtcn d. W'aldhiinine, 1874.
Size: 3141px × 1591px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
