. Fio. 196.—Caeoma 'pinitorquum. Section showing four pycnidia, from one of which (xj>) numerous conidia are being discharged. Caioma-pMches are developing beneath the 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 jnnitorquMm} This disease attacks pine-seedlings, appearing generally on the needles. It is most frequent in plantations from one to ten year
. Fio. 196.—Caeoma 'pinitorquum. Section showing four pycnidia, from one of which (xj>) numerous conidia are being discharged. Caioma-pMches are developing beneath the 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 jnnitorquMm} 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. Pinus sylvcstris is most commonly attacked, but it has also been observed on Pinus montana in Jiitland. After formation of the Caeoma--psitches, 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, mchfi'je Krankhcitcn d. Wahlhamne, 1S74.
Size: 3138px × 1593px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
