. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. 344 BACTERIA IN RELATION TO PLANT DISEASES. THE PARASITE. Bacterium hyacinthi* Wakker is readily isolated. In the plant and on agar and in beef- broth, etc., it is a short rod, single or in pairs, or more rarely in fours joined end to end (figs. 139, 140). Rarely short chains have been observed, e. g., on agar. It measures under these circumstances to to 2 /jl, but like many other organisms, it is longer or shorter, thicker or thinner, according to age, culture-medium, and kind of stain used. It is gen- eral
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. 344 BACTERIA IN RELATION TO PLANT DISEASES. THE PARASITE. Bacterium hyacinthi* Wakker is readily isolated. In the plant and on agar and in beef- broth, etc., it is a short rod, single or in pairs, or more rarely in fours joined end to end (figs. 139, 140). Rarely short chains have been observed, e. g., on agar. It measures under these circumstances to to 2 /jl, but like many other organisms, it is longer or shorter, thicker or thinner, according to age, culture-medium, and kind of stain used. It is gen- erally slenderer than Bad. campestre or Bad. phaseoli. The following are some measurements: (i) February 5, i8p8. Slime from a daughter-bulb stained 5 minutes in a saturated solution of basic fuchsin (very weak stain). Rods short, to to Two minutes in saturated watery solution of Gentian violet gave a deeper stain but not deep enough. (2) February/, 1898. Alkaline beef-broth. No. i, Jan- uary 29, 1898, stained 10 minutes in saturated watery solution of basic fuchsin. ^1'! X o. 4m [single rods. I , two rods joined end to end. two rods joined end to end. Widest rods seen (3) July 31, i8g8. Slide of March 10 from very dilute beef-broth 3 days old, Moore's flagella stain. Size i to 2X to ^JL. Flagella 3 times length of rods. (4) August 3, i8g8. Slide of March 17, 1897, agar stock 207, Fischer's flagella stain:. 2 XI. om 2 to 3X1 .Cm. to i .Cm several. (5) August 3, i8g8. Slide of June 23, 1897, made from the interior of a bulb (yellow slime). Plant inoculated on leaf February 16, 1897. Stain, basic fuchsin in water. two; ; ; Extremes, to Most I to ; Pseudozoogloeae are common. No spores have been discovered by the writer, and the spores described by Wakker probably belonged to some other organ- ism, f This is the more likely because the cultures in which th
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