The Influence of Environment Upon Bacillus Phytophthorus And the Potato Blackleg Disease
The Influence of Environment Upon Bacillus Phytophthorus And the Potato Blackleg Disease
Welles, Colin Gilchrist
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4t first, no growth took place below 17^ C. liach succeeding day, for several days after this was noticed, growth was found at a lower temperature, until 3^ C. was reached. In about twelve days growth appeared even at that temperature, but to a limited extent, not increasing much in the time before the cultures were discarded. At the temperatures above the optimum growth appeared, as in the lower temperatures, with the lapse of time. In this case, however, the decline in growth was much more ra...pid than at the lower temperatures. In other words, the decline from the optimum growth is much more rapid on the higher temperature side than on the lower. Figures 1 to 6 show graphically the growth on the second thru the sixth, and the fourteenth days. The first five Digitized by Google Digitized by Google -21- figures show quite regular curves, with an optimum at about E5 , at least 23 and 28^C. Because of the relative inaccuracy of the comparative methods , some curves seem to show that a very good, if not an equally abundant growth of the organism took place at temperatures slightly above or below the optimum.
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