. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 2;6 DISEASES OF CULTIVATED PLANTS one time male or fertilising bodies. After the dead infected leaves have been lying on the ground throughout the winter, ascospores are formed in cavities in the stroma. These ascospores escape into the air in the spring and infect the young leaves. The spermatia are cylindrical, hyaline, about 6-9 X i /<â . Ascospores needle-shaped, hyaline, often slightly curved, 60-80 X I "5-2-5 ii; paraphyses very slender, ti
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 2;6 DISEASES OF CULTIVATED PLANTS one time male or fertilising bodies. After the dead infected leaves have been lying on the ground throughout the winter, ascospores are formed in cavities in the stroma. These ascospores escape into the air in the spring and infect the young leaves. The spermatia are cylindrical, hyaline, about 6-9 X i /<â . Ascospores needle-shaped, hyaline, often slightly curved, 60-80 X I "5-2-5 ii; paraphyses very slender, tips curved. The disease sometimes proves to be very destructive directly. Fig. T^.âKhytisma accrinutn. 1, sycamoie leaf with blotches caused'by fungus ; 2, section through a blotch bearing conidia ; 3, ascus with spores, also two para- physes ; 4, an ascosporc. Figs. 2-4 mag. and indirectly. Several large patches are frequently present on a leaf, and as a rule, when the disease is present, nearly every leaf is attacked, hence a considerable area of leaf surface is prevented from doing its work. In addition diseased leaves fall early, and as the disease, unless checked, appears year after year, the tree bet'omes enfeebled owing to lack of food, and badly matured wood, when it easily falls a prey to a yet more dangerous parasite, the coral spot fungus {Ncctria cinnaharifta), which often follows an epidemic of leaf blotch. When the diseased leaves have fallen, the tree is perfectly clear of the fungus, and the only possible means of further infection is due to spores alighting on the young leaves, 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 Massee, George, 1850-1917. New York : Macmillan
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
