Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . to be largely due to thefact that if scabby potatoes are fed to stock, the sporesof the fungus can pass through the alimentary canaluninjured, and c^in multiply abundantly in the manureheap. Consequently they will be transferred to the field,and when the potato tubers are developing, will attackthem and produce the injury. The fungus-producing scab is an obscure one, whichbotanists have studied only recently. It can generallybe seen on partially developed s
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . to be largely due to thefact that if scabby potatoes are fed to stock, the sporesof the fungus can pass through the alimentary canaluninjured, and c^in multiply abundantly in the manureheap. Consequently they will be transferred to the field,and when the potato tubers are developing, will attackthem and produce the injury. The fungus-producing scab is an obscure one, whichbotanists have studied only recently. It can generallybe seen on partially developed scabby jiotafcoes, in theshape of fine white threads running over the reproduces by means of sj^ores. Repeated experi-ments have shown that if scabby potatoes are planted, alarge percentage of the resulting crop will be scabby. THE POTATO SCAB 169 Professor II. L. Bolley has shown that what is probablythis same disease occurs also on beets planted on j^otatoground. Treatment.—Dr. Roland Thaxter, after seyeralyears of careful study, summarizes the preyentive meas-ures to be taken against this disease as follows : (1) The. FIG. 74. POTATO INJURED BY SCAB. seed must be free from any scabs. (2) Land wliicli hasproduced scabbed cro]3s in previous years, either of pota-toes or of beets, or has been fertilized with manure fromscab-fed stock, must not be planted to potatoes. (3)Scab potatoes should neyer be fed to stock, under any 170 FUXGI AND FUNGICIDES circumstances, unless they have been thoroughly cooked,even if the land on which the manure is to be used isnot to be cropped with potatoes at once. (-4) In gen-eral, any fertilizer is to be preferred to barnyard manurefor potatoes, whether the stock has been fed with dis-eased potatoes or not. (5) If it is suspected that a cropis scabbed, it is of great importance to dig the potatoesas soon as possible after tbey are mature, since the seal-spots increase in size, and deepen, as long as they areleft in the ground, and what
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
