. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 296 Bulletin 239. site and one that requires further observation before definite statements can be made. Having gained entrance to the leaf, the disease graduahy travels down the stem to other leaves and to the pods. Professor Barlow, of the Ontario Agricultural College, has shown that the progress of the disease is comparatively slow. Leaves of beans inoculated with the bac- teria did not show -symptoms of the disease until the third week. The bacteria
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 296 Bulletin 239. site and one that requires further observation before definite statements can be made. Having gained entrance to the leaf, the disease graduahy travels down the stem to other leaves and to the pods. Professor Barlow, of the Ontario Agricultural College, has shown that the progress of the disease is comparatively slow. Leaves of beans inoculated with the bac- teria did not show -symptoms of the disease until the third week. The bacteria increase in such numbers that finally they may fill up the sap tubes in the stem, cutting ofi: the water supply and so cause the entire plant to wilt and die. The disease in the pods.— Through wounds or by way of the stem the bacteria find their way into the pods which, if young, may shrivel and die. In the larger pods they produce spreading watery spots (Figs. 110 and III) wdiich finally become more or less discolored but never sunken and black as in the case of the anthracnose. The disease in the seed.— From the pod the disease readily gains entrance to the growing seeds. The pods are not destroyed unless at- tacked when very young, and when ripe they may show considerable dis- coloration or none at all. The bacteria, however, having gained entrance into the seed, as in the case of the anthracnose, remain there dormant throughout the winter. With the germination of the seed in the spring the bacteria also begin to multiply and find their wav to healthv beans and so the infection spreads. Fig. 112.—Bac- teria thai- cause the bean blight initch mai^ni- ficd. {After Smith.) Treatment of Blight Seed treatment.— No method of treating the seed to prevent the blight has yet been proposed and properly tested. Professor Barlow has demonstrated that the bac- teria arc readily killed by exposure for ten minutes to. ...4. Please note that these images are extracted from scanned p
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