. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . no. 17. APPLE SHOWrXG ROT SPOT. tules scattered oyer the surface of the apple. These arethe fruitinor spots of the funsrus. The mycelium whichhas penetrated the pulpy tissue of the fruit in all direc-tions, disorganizing it and causing the rot, here developsa large number of cells, which rupture the skin of theapple and produce the spores at the tips of slender pro- THE BITTER ROT 35 jecting threads. These spores are blown off by thewind, or washed downwa
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . no. 17. APPLE SHOWrXG ROT SPOT. tules scattered oyer the surface of the apple. These arethe fruitinor spots of the funsrus. The mycelium whichhas penetrated the pulpy tissue of the fruit in all direc-tions, disorganizing it and causing the rot, here developsa large number of cells, which rupture the skin of theapple and produce the spores at the tips of slender pro- THE BITTER ROT 35 jecting threads. These spores are blown off by thewind, or washed downward by rain. When one of themlodges u2)on another apple, where sufficient heat andmoisture is present, it germinates by sending out a littletube, and may thus start the disease in a new the mycelium of the fungus running through theapple is carefully examined, one will see at frequentinteryals on the threads small spore-like bunches, simi-lar to those shown in B, Fig. 19. From these othermycelium threads may start. In the same figure a ger-. FIG. 18. SECTION OF PUSTULE. A, Mass of fuugus threads and cells; B, spore-bearing threads; C C, skin of apple ruptured by the fungus. minating summer spore is seen in C, and one of the pus-tules already referred to in A. This same fungus attacks grapes, and Dr. Halsteadhas recently found that it will develop upon pears,peaches, egg plants and i)eppers. Consequently it seemsto have a wide range of hosts, and general clean cultureis evidently important as a method of preventing itsinjuries. Treatment.—The first step toward the successfulprevention of this disease is the removal and burning ofthe mummied apples on the trees. This should be doneduring winter. It would be desirable, also, to rake upand burn, or bury, the fallen fruit and surrounding rub- 3G FUXGI AXD FUXGICIDES bish. Then the Bordeaux mixture treatment recom-mended for the preyention of apple scab will have adecided influence in lessening the amount of damage. An
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
