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Wash, The Breeding and Development of Potato Varieties . To 



develop and test new and old varieties of potatoes and 

 determine their comparative values as related to commercial 

 adaptability, and to cooperate with Plant Pathology Department 

 in determining their resistance to leaf roll, 

 Hort., PI. Path. 1122 Coop. ARS 



W. Va. Improvement of Potato Varieties for West Virginia , (l) 

 To select promising breeding stocks of improved physiological 

 and morphological characteristics having greater resistance to 

 disease, insect injury, and unfavorable environmental qualities 

 commonly found in West Virginia; and (2) to learn the nature, 

 variability, and methods of inheritance of resistance in potato 

 varieties to diseases and to injuries by insects and environ- 

 mental factors. 



Hort., PI. Path, 4 



Wis. The Improvement of Quality and Disease Resistance of the 



Potato and Methods of Accomplishing This by Breeding . Develop 

 high quality and disease-resistant potatoes that will sell more 

 successfully on early and late markets. 

 Genet., PI. Path. 566 Coop. ARS 



Wis. Relationship of Plant Nutrition to Disease Incidence 



and Expression of Symptoms . To learn influence of various 

 (l) plant nutrient ratios and levels on visual expression of 

 certain potato virus and other diseases; (2) nutrient ratios 

 and levels on plant susceptibility to disease and their effect 

 on yields; (3) nutrient ratios and levels on behavior of virus 

 in plant, measured quantitatively; (4) potato virus diseases 

 on nutrient uptake by plant. 



PI. Path., Ent., Soils 774 



Wyo. Breeding and Selection Studies with Potatoes . To (l) 



test varieties and promising seedlings for adaptation to 

 Wyoming; (2) develop new superior varieties; (3) test new 

 varieties and promising seedlings for ring rot and scab 

 resistance for keeping and cooking quality; and (4) maintain 

 foundation seed of adapted varieties, 

 Agron. 488 



