76 THE POTATO 



onds between two and four ounces, and tubers less 

 than this weight, are hardly worth picking up. 



3. Ability to resist diseases. No varieties can be 

 termed ' ' disease proof, ' ' but many varieties are better 

 disease-resisters than others. Stuart, of New Hamp- 

 shire, found that the variety Hulett's Rust Proof was 

 the only one that was disease-resistant out of several 

 varieties, although the varieties Dakota Red, Green 

 Mountain, New Queen, and Enormous showed some 

 resistance. Hulett's Rust Proof falls below the re- 

 quirements in other respecfls and is of little value, and 

 in Minnesota has been found to be subjedl to disease. 

 At Ontario Agricultural College, Carman No. 3 and 

 Stray Beauty resisted disease well. At Minnesota 

 Experiment Station, Rural New Yorker and Sir Wal- 

 ter Raleigh showed some resistance.^ 



4. The color of the skiyi and tuber. Manj- of the 

 colored-skinned varieties of potatoes, and those show- 

 ing a blush of pink — as, the Beauty of Hebron, Early 

 Rose, etc. — belong to a tj-pe which have white blooms. 

 They are generally earl 5^ maturing, rather liable to dis- 

 ease, and of good quality, according to the American 

 standard. The colored-skinned early varieties are gen- 

 erally more readily sold than the late ones, although 

 in some districts colored-skinned potatoes are not ob- 

 jedled to on the market. All colored-skinned potatoes 

 are not deficient in vigor. Some are among the best 

 disease-resisting and best-flavored varieties, but the 

 red color of some weak varieties has rendered some 

 growers skeptical of all. 



• Minn. Bui. S7, p. 2. ^ Minn. Hul. 87, p. 10. 



