. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. BROWN Rot Spores Developing Magnified blown upon the damp fruit send out their germinating tubes into the tissues where they grow, branching in all directions. These branches absorb the cell contents. In this way the green tissues are broken down, the Ught green color is turned to brown, and the so-called rot ap- pears. On the outside, the fruit first turns brown in one or two places, then more and more of the surface appears affected, until finally the whole surface shows
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. BROWN Rot Spores Developing Magnified blown upon the damp fruit send out their germinating tubes into the tissues where they grow, branching in all directions. These branches absorb the cell contents. In this way the green tissues are broken down, the Ught green color is turned to brown, and the so-called rot ap- pears. On the outside, the fruit first turns brown in one or two places, then more and more of the surface appears affected, until finally the whole surface shows the injury. Soon after the fruit has thus be- come discolored, it is likely to show a curious velvety coating — more or less grayish in color — that is made up of milUons of tiny spores. They are produced by the threads of mycelium that have been developing amid the tissues of the fruit. Under the micro- scope they are easily seen to resemble the figures below. These spores are blown everywhere by the wind and serve to spread the disease very rapidly. A single affected fruit may furnish millions of spores for the wind to sow broadcast over the surrounding country. Unless the diseased fruits are re- moved, many of them remain upon the tree. They shrivel slowly into dry and mummied fruits inside which the threads of mycelium develop into blackish bunches that correspond in a way to winter spores and enable the fungus to survive the winter, and to produce a new crop. Brown Rot a, spores; d, spores ger- minating; magnified. 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 Weed, Clarence Moores, 1864-1947. Boston ; New York : D. C. Heath & Co.
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1910
