. Carnegie Institution of Washington publication. 164 BACTERIA IN RELATION TO PLANT DISEASES. Judging from our experiments and from the way it has behaved in Michigan this new disease bids fair to be a very serious one. Its geographical distribution is not known. In 1912 it appeared on tomatoes in a hot-house at Arkport, in western New York.* The writer is also inclined to believe it is identical with the potato disease described by Spieekermann (see p. 166) as widely prevalent in his part of Germany (Westphalia), although the few experiments I have thus far made upon potatoes have been negati
. Carnegie Institution of Washington publication. 164 BACTERIA IN RELATION TO PLANT DISEASES. Judging from our experiments and from the way it has behaved in Michigan this new disease bids fair to be a very serious one. Its geographical distribution is not known. In 1912 it appeared on tomatoes in a hot-house at Arkport, in western New York.* The writer is also inclined to believe it is identical with the potato disease described by Spieekermann (see p. 166) as widely prevalent in his part of Germany (Westphalia), although the few experiments I have thus far made upon potatoes have been negative. RESUME OF SALIENT CHARACTERS. POSITIVE. A short, yellow, rod-shaped schizomycete, parasitic on solanaceous plants, especially tomato (and potato ?), causing a slow, destructive disease of the whole plant. Isolated in the United States by the writer from tomato stems (Michigan, 1909; New York, 1912). Grows very slowly on +15 nutrient agar and +10 gelatin and also slowly in +15 nutrient bouillon. Liquefies gelatin slowly. Coagulates milk slowly, forming in test-tubes a pellicle and a wide yellow bacterial rim. In tubes of litmus milk, inoculated copiously from solid cultures (potato), no change in appearance until after the fourth day. On the ninth day (temperature 260) there was a wide yellow rim, a yellow pellicle, and the litmus had changed to a gray blue. After 24 days the litmus was wholly reduced, i. c, there was not a trace of the blue. The milk was thick, yellowish, and opaque, without much separation of the whey from the curd. There was a char- acteristic wide yellow bacterial rim, and in two of the four tubes the milk was distinctly stringy. On potato 27 days old (temperature 260 C.) there was a moderate amount of yellow slime both on the surface and at the bottom of the water, but the fluid was not solid. Rather more growth than in case of Bad. stewarti, but not in quantity like Bad. campestre. Potato moderately grayed. On slant agar 27 days old (temperature 260 C.
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