Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . n the pod of such anattack is disastrous; it is shrunken and out of shape,and the beans within are dwarfed and shriveled. This disease is seldom destructive, except duringseasons of rainy weather. It occurs in several Europeancountries, and has been found over a large portion ofthe United States. It winters over, in part, by meansof diseased seeds, which, when planted, start the fungusagain, and it spreads rapidly when sound and affectedstring beans are sen
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . n the pod of such anattack is disastrous; it is shrunken and out of shape,and the beans within are dwarfed and shriveled. This disease is seldom destructive, except duringseasons of rainy weather. It occurs in several Europeancountries, and has been found over a large portion ofthe United States. It winters over, in part, by meansof diseased seeds, which, when planted, start the fungusagain, and it spreads rapidly when sound and affectedstring beans are sent to market in the same same fungus attacks melons, and other cucurbita-ceous plants, causing a rind-rot. Consequently, beansand melons should not follow each other in rotation, asthe spores in the ground will cause trouble. While the attack of this fungus on the pod is mostnoticeable, it does not confine itself to this part of theplant. In case diseased beans are used for planting,the attack may be noticeable as soon as the seed-leavescome up, and may develop so rapidly as to injure the9 129 130 FUXGI AXD FUNGICIDES. FIG. 55. BEAN PLANT ATTACKED BY ANTHRACNOSE. THE POD-SPOT OR ANTHEACNOSE 131 stalk (Fig. 56) and kill the plant. In this way a fourthof the seeds ^olanted are sometimes killed off. As theleaves develop they are attacked, the veins becomingblackened, and discolored spots appearing. Dots of alight pink color appear on the middle of the spot shortlyafter it has formed. A microscopic examination willshow that these dots consist of spore masses held togetherby a mucilaginous substance, which is readily soluble inwater. When the enveloping mucilage is dissolved thespores are set free, to be blown or washed about, or car-ried to other plants by insects or other agencies. Treatment.—Planting in a light soil, on high,well-drained land, is one of the best preventives of thisdisease. Experiments in New York have shown that itis well worth while to examine t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
