. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 70.— Half grown apple inoculated willi pure cnl- ttirc of bacteria from can- ker on liiub of apple tree. Noic inilky drops exuding from diseased tissue. The wounds or punctures of insects seem to be directly responsible for some of the in- fections. Sometimes cankers on the bodies of trees cannot be attributed to infection through blighted shoots. In some cases these cankers have been traced directly to the wounds made by insects. Fig. 78 shows a ho
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). Fig. 70.— Half grown apple inoculated willi pure cnl- ttirc of bacteria from can- ker on liiub of apple tree. Noic inilky drops exuding from diseased tissue. The wounds or punctures of insects seem to be directly responsible for some of the in- fections. Sometimes cankers on the bodies of trees cannot be attributed to infection through blighted shoots. In some cases these cankers have been traced directly to the wounds made by insects. Fig. 78 shows a hole made by a borer at the base of a tree and surrounding it is a well developed canker. It is very probable that many of the cankers at the base of young trees origi- nate in wounds made by borers. The bac- teria are probably carried to these wounds by flies or other insects which visit these places to feed on the exuding sap and excre- ment. The infecting agents in the case of crotch cankers have mot as yet been defi- nitely determined. It seems likely that in- sects again are here responsible. I have. Fig. 71.— Naturally infected apple. Infection probably took place in the spur at the base of the stem, through which it worked its way to the young 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 Cornell University. Agricultural Experiment Station. Ithaca, N. Y. : The University
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