36 BACTERIA IN RELATION TO PLANT DISEASES. 



Striped Green. 



97 A. White striped in the pricked area. Small strip of dead tissue on either side of the midrib. White stripes run up 

 and down 5 inches. Slight red stripes. 



97 B. White stripe in the pricked area, extending upward 3 inches. 



98 A. Shows distinct white stripes in the pricked area and some dead tissue on one side of the white stripe, extending 



upward 8 inches above the pricks. 



98 B. Conspicuous red stain in the pricked part of the midrib, extending downward 2 inches below the pricks. Some 



dead tissue to either side in the pricked part. Interrupted white stripe on one side extends upward 8 inches 

 and downward about 6 inches. 



99 A. Dead tissue in the pricked area. Red stain in the midrib of that part, extending upward interruptedly 4 inches 



above the pricks. White stripe to either side of the midrib, extending upward about 4 inches above the 

 pricks. 



99 B. Some dead tissue in the pricked area. Conspicuous narrow white stripe to either side, extending upward 4 or 5 



inches. 



Crystalina. 



100 A. Slight signs confined to the pricked area. Some red stain in the midrib. 



100 B. Signs less than in 100 A. No red stain. 



101 A. Slight signs in the pricked area. 



101 B. Slight signs in the pricked area. Plant evidently quite resistant. 



1 02 A. Slight signs in the pricked area. 



1 02 B. Very inconspicuous signs in the pricked area. None above or below. 



103 A. Very inconspicuous signs in the pricked area. 



103 B. Same as 103 A. 



104 A. Slight striping in the pricked area. Very faint red in the midrib. 



104 B. More conspicuous striping in the pricked area; runs upward 2 or 3 inches; downward 4 or 5 inches. More con- 



spicuous red in the midrib. 



105 A. Slight white striping in the pricked area; runs upward 2 inches. 



105 B. White striping in the pricked area; runs upward 3 to 4 inches; downward 2 inches. Very slight red mark in midrib. 



General Remark. The disease is taking quite generally, but the signs are not yet very 

 conspicuous. 



On June 20, the signs were progressing slowly. I could see increased striping since 

 June 13, but no secondary signs. 



On June 28, 1905, the inoculations of May 22, on the leaves of the different varieties of 

 sugar-cane in this house, were progressing finely. The signs of the disease on the inoculated 

 leaves had become more pronounced in most cases than they were when the last records 

 were made. One inoculated leaf on the Common Green cane had now entirely dried out, 

 and many of the inoculated leaves on several varieties showed long yellowish-white stripes, 

 much longer than at the last writing. The Crystalina, which appeared at first to be quite 

 resistant, now showed marked striping on its inoculated leaves. The most resistant varie- 

 ties at this time appeared to be Jamaica and Louisiana No. 74. 



On July 7, 1905, the condition of the sugar-cane, inoculated May 22 in hot-house No. 4, 

 was as follows : 



Cinta. 



61 A. Leaf plainly diseased for a distance of i foot below the pricks and 2 feet above. Yellowish-white stripes with 

 small red-brown spots on them. No secondary signs. 



6 1 B. Whole leaf diseased. Dying from the apex back, and yellow striping toward the base. 



62 A. Signs on the leaf now extend down to the base of the blade and up a distance of 4 feet. No secondary signs. 



62 B. Same as 62 A. 



63 A. Whole leaf diseased. Dead striping extends up at least 4 feet. No signs on the uninoculated leaves. 

 63 B. Signs extend to the base of the blade and up a distance of several feet. 



64. No record. 



65 A. The striping is visible on this leaf for a distance of 3 feet upward from the pricks, and downward nearly to the 

 base of the blade. No constitutional signs. 



65 B. Whole leaf diseased; nearly all of it dried out. 



66 A. White striping for about 2 feet. No general signs. 



66 B. White striping extending to the base of the leaf from the pricks, and upward 2 feet. 



67 A. White striping extending from the base 2.5 feet above the pricks. Dead on one side for a long distance. 



67 B. White striping extending from the base about 2 feet up. Dead on one side for about 10 inches. No secondary 



signs. 



Caledonia Queen. 



68 A. Inoculated leaf. White striping from base to within a few feet of the top. Half of the blade dead. 



68 B. White striping the whole length of the leaf. No secondary signs. 



69 A. White striping the whole length of the leaf. One edge of the leaf dead to within about a foot of the top. 

 69 B. White striping extending above the pricks 2.5 feet and only about i inch below. No secondary signs. 



