Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . lished the illustrations appearing above. An effect yerysimilar to club root is often produced on the roots of agreat variety of plants by the little worms calledNematodes. FUNGI AFFECTING CELERY The Celery Blight Cercospora apii The common blight of celery, sometimes incorrectlycalled the rust, is a destructive and widespread disease,which appears from the middle to the last of summer. Its presence is usuallyfirst seen in the shapeof small, irregular, yel-
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . lished the illustrations appearing above. An effect yerysimilar to club root is often produced on the roots of agreat variety of plants by the little worms calledNematodes. FUNGI AFFECTING CELERY The Celery Blight Cercospora apii The common blight of celery, sometimes incorrectlycalled the rust, is a destructive and widespread disease,which appears from the middle to the last of summer. Its presence is usuallyfirst seen in the shapeof small, irregular, yel-lowish-green spots, lessthan a quarter of aninch in diameter, uponthe leaves. These sjiotsincrease rapidly in size,and soon chano;e to abrown color. In a shorttime they so spread asto form great blotches,involving a large por-tion of the leaf, whichmay finally wither anddie. The fungus caus-ing this disease repro-duces by means of elon-gate spores. When oneof these falls upon amoist celery leaf it ger-minates by sending outa long tube, which penetrates the leaf, and develops themycelium among the cells. Here it continues growing 144. FIG. 61. CELERY LEAF SHOWINGBLIGHT. THE CELERY BLIGHT 145 for some time; then certain branches of the myceliumare pushed through the breathing pores, or stomata, ofthe leaf, and produce on their tips the spores. Fig. 62J, represents a sectional view of a leaf having the m3^ce-lium developed among the cells, and the spore-producingbranches coming out through a breathing pore. In a,of the same figure, two spores in process of germina-
Size: 1315px × 1900px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
