50 LABORATORY MANUAL IN FIELD CROPS 



PRACTICUM NO. 39 



Object. The Use of the Potato and the Qualities of Good 

 Seed. 



Materials. Reference work. 



Method. Answer all questions and give all discussions in 

 full in your notebooks. 



1. Name five plants belonging to the same family as the 

 potato. (Gray's Botany.) 



2. Discuss the following factors as influences on potato 

 yields : purity of seed, productive parents, immaturity of 

 seed, diseased condition, amount per hill, storage of seed, size 

 of seed. (Farmers' Bulletins Nos. 35, 533.) 



3. Discuss with reference to the causes, the nature of the 

 damage, and eradication methods, the following diseases and 

 pests: late blight, blackleg, Colorado beetle, dry rot, scab, 

 rhizoctonia. 



4. Discuss the importance of the potato as a source of 

 denatured alcohol, and tell briefly how denatured alcohol is 

 made. 



REFERENCES 



United States Department of Agriculture, Office of Experiment Stations 



Circular No. 77, p. 37. 



Bailey's Cyclopedia of American Agriculture, Vol. 2, pp. 519-528. 

 Farmers' Bulletins Nos. 35, 533. 

 Farmers' Bulletin No. 91. 

 Farmers Bulletin, Denatured Alcohol, No. 410. 



