FIELD SOURCES of cristacortis virus with the same source of cristacortis are generally contaminated with virus as in 1 .; they were provided by concave gum psorosi,~ virus (2). R. Vogel.
In the course of work undertakenLeaves from healthy seedlings or to obtain a culture of cristacortis trees were used for controls. virus free from that of concave gum, we encountered another virus, one
Experimental Work that produces necrotic local lesionsNo transmission was obtained in citrus. This virus was shown, as when crude extracts of citrus leaves reported herein, to be a strain of were used for mechanical inoculatobacco necrosis virus (TNV); it is tion of various herbaceous plants. referred to for convenience as TNV-Partially purified preparations were CT.then tried. Leaves were homogenized in buffer containing 0.02 M
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