. Fig. 147.—Cercospora apii. i, celery leaf attacked by the fungus ; 2, fruit of fungus, highly mag. hyaline, almost cylindrical, a little thickened at one end, 3-10 septate, 50-80 X4 /x. Spraying with amraoniacal carbonate of copper solution is most efficient in checking the disease, if applied before the disease has advanced too far. The spores on diseased leaves live through the winter, and are capable of infecting a crop the following season, hence the leaves should be gathered and burned. Some portions of leaves, however, are certain to remain on the ground, and rotation of crops, where p
. Fig. 147.—Cercospora apii. i, celery leaf attacked by the fungus ; 2, fruit of fungus, highly mag. hyaline, almost cylindrical, a little thickened at one end, 3-10 septate, 50-80 X4 /x. Spraying with amraoniacal carbonate of copper solution is most efficient in checking the disease, if applied before the disease has advanced too far. The spores on diseased leaves live through the winter, and are capable of infecting a crop the following season, hence the leaves should be gathered and burned. Some portions of leaves, however, are certain to remain on the ground, and rotation of crops, where practic- able, would be the safest method. It is stated that when celery is shaded by some means it remains free from disease. This method, however, is only practicable perhaps on a small scale.
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
