New York Agricultural Experiment Station. 237 



were potted and placed in the greenhouse to force their foliage. 

 About the middle of February sixteen plants were received from 

 Stone of Amherst, these having been collected in an infected planta- 

 tion in Massachusetts. These had been dug late in the fall and 

 shipped soon afterwards, but by mistake had been sent to Storrs, 

 so that by the time I received them they were beginning to leaf 

 out. They were immediately placed in the greenhouse. All of 

 these plants received from Stewart and Stone were kept in the green- 

 house until late summer, examined from time to time, and no signs 

 of the rust appeared on any of them. We still have some of them 

 in the greenhouse at this date, January 1, 1914, but we have not 

 seen the rust on any of these. It appears as if the rust did not carry 

 over on this host through infections of the young perennial tissues 

 the previous year. Certainly it does not commonly do so. 



" I also received from Stewart some infected currant leaves which 

 had been kept out-of-doors over winter, and in April I tried to 

 infect young currant leaves from the III stage showing on these 

 old leaves. This stage was not in good shape, indicating that its 

 time for germination is in the fall rather than in the spring. As 

 expected, I did not get any infection from this stage, as it is supposed 

 to infect only the white pine." 



Dr. Stone writes as follows concerning his experiments and observa- 

 tions in Massachusetts: 



" For four or five years past the pine blister-rust has been found 

 on imported stock in our Massachusetts nurseries, rarely if ever 

 being found on native stock. During September, 1912, a specimen 

 of currant rust was sent into the station from Ipswich, Mass., and 

 this is apparently the first record of the rust in Massachusetts. 

 At that date it was confined entirely to the black currants, variety 

 Black Champion, of which there were four or five hundred bushes. 

 None of the red currants were infected, and there were several 

 acres of these growing with the black currants. One-fourth of a 

 mile distant there was an older block of black currants which did 

 not show the slightest infection. 



"We received over three dozen infected black currant plants from 

 Ipswich in the fall of 1912, and also two dozen from the Geneva 

 Experiment Station. Some of each lot were transplanted directly 

 into our greenhouse where the temperature maintained was 45° at 



