8 A. L. PlERSTORFF 



were susceptible. In order to obtain some information on this point, 

 blossoms of Rosa blanda Ait., B. rubiginosa L., and an open-pollinated 

 seedling of R. rwbifolia Br. growing on the college farm, were atomized 

 with a forty-eight-hours-old culture of B. amylovorus on July 4, 1!»2<>. 

 The results recorded on July 23 showed nine of eighty-six inoculated 

 blossoms of B. blanda blighted, sixteen of one hundred and seventy-two 

 blossoms of B. rubiginosa, and only one, and that a doubtful case, of 

 sixty -three inoculated blossoms of B. rubifolia. 



On July 20, isolations made from two blighted blossoms of B. blanda 

 yielded the blight organism. The infection resulting from needle inocu- 

 lations on the stems is shown in Plate I, 2. 



With the foregoing data as a basis, the writer draws the conclusion 

 that some varieties of roses can be infected by B. amylovorus. Waite 

 (1925) states that he obtained infection on semi-dormant rose cuttings. 

 According to the report, no reisolations were made and the cuttings 

 in water under a bell jar were soon overgrown by mold fungi. How- 

 ever, it appears probable that Dr. Waite 's conclusion that the cankers 

 were caused by the fire-blight organism is correct. 



INOCULATIONS ON JAPANESE QUINCE 



(Chaenomeles lagenaria Koidz.) 



In order to test the susceptibility of the blossoms of Chaenomeles 

 lagenaria Koidz, to the fire-blight organism, two hundred and fifty 

 blossoms were atomized with a virulent bouillon culture on May 28, 

 1926. On June 15, all blossoms had fallen and none appeared to have 

 blighted. 



On June 22, 1926, twenty terminals of C. lagenaria were punctured 

 with a sterile needle dipped in a culture of Bacillus amylovorus. On 

 July 4, two terminals were killed back about three inches from the point 

 of inoculation. Ten more terminals were inoculated at this time. On 

 July 21, two of these shoots showed symptoms of blight, and isolation 

 from them and reinoculation into apple seedlings proved the presence 

 of B. amylovorus. Three green fruits also were punctured with a 

 needle dipped' in a bouillon culture, but frequent inspections revealed 

 no blight symptoms on these. It appears from these results that C. 

 lagenaria also is a suscept for the fire-blight disease, but is not likely 

 to be severely affected. 



INOCULATIONS ON PIIOTINIA 



(Photinia villosa DC.) 



Following a suggestion of Professor 11. II. Whetzel, of the Depart- 

 ment of Plant Pathology at Cornell University, inoculations were made 



