RESISTANCE TO SCAB. 35 



Professor Kuelin (Rhode Island); Million Dollar (Michigan); Orange 

 Blossom (Vermont); Rural New Yorker No. 2 (Vermont); Scabproof 

 (Wisconsin); Squier (Vermont); Star of the East (Maine); State of 

 Maine (Canada); Swiss Snowflake (Canada); Virgirosa (Vermont); 

 Westfield (Vermont); White Scotch King (Minnesota). In addition 

 three unnamed varieties received favorable mention from Vermont. 



From these reports it is observed that certain varieties like Dakota 

 Red, Rustproof, and Keeper have very well proved powers of disease 

 resistance, but lack other desirable characters to make them popular 

 varieties. Several of the standard main-crop varieties are in some 

 degree disease resistant, and doubtless owe their general popularity, in 

 a measure, to this fact, although it has not been clearly defined. To 

 this group belong Carmen's best productions — Carmen No. 3, Sir 

 Walter Raleigh, Rural New Yorker No. 2, and Rural Blush — Green 

 Mountain, State of Maine, Delaware, Enormous, and White Beauty. 

 Irish Cobbler is highly spoken of as disease resistant, but it is a 

 question whether this may not be in part due to its early maturity, by 

 \ virtue of which it escapes the worst ravages of Ph3^tophthora. 



There is also a very promising series of new seedlings which should 

 be carefully watched as to disease-resisting characters, among which 

 may be especially mentioned Norcross, Star of the East, and Babbitt 

 (Johnson Seed Company); Vermont Gold Coin (Burpee); Ionia Seed- 

 ling (Dibble); Harris Snowball (Harris & Co.). 



It is encouraging to learn from the replies that several of the newer 

 German and English varieties which are reputed disease resisting in 

 their home countries have upon trial in America made a good show- 

 ing. This is evidenced b}- the reports from the Rhode Island and 

 Canada stations favorable to Professor Maercker, Gloria, Professor 

 Kuehn (German), Holborn Abundance (English), and Swiss Snowflake. 



RESISTANCE TO SCAB. 



It is a matter of common observation that some varieties of potatoes 

 are more liable to seal) than are others. Reference has been made 

 earlier in this publication to conclusions to this effect reached in Ger- 

 many. So far as known the only American publication recording the 

 results of comparative trials as to scab resistance is that made by the 

 Vermont Agricultural Experiment Station in 1901-2." Thirteen varie- 

 ties were tested in 1901 and fourteen in 1902 in soil badly infested 

 with scab germs. While all showed some scab, there was a consider- 

 able difference in the amount. Sir Walter Raleigh made a good show- 

 ing Vjoth years, but an unnamed seedling sent by Mr. A. E. Manum, 

 his No. 56, was more highly resistant. These trials established the 

 writer's confidence that still more resistant strains may be secured by 



a Jones, L. R., and W. J. Morse. Vermont Exp. Sta. Report, XV: 225 (1902). 



