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N. C. Irish Potato Breeding , To (l) develop varieties which 



are early maturing, productive, resistant to major diseases and 

 insects, and superior in carrying and in market qualities; (2) 

 establish and maintain special/ breeding lines carrying genetic 

 characters that are important in southern region; (3) study 

 inheritance of a, resistance to scab, and to southern bacterial 

 wilt, b. tuber color, and c. time of maturity. 

 Hort. 81 Coop. ARS 



N.Pak. Nitrate Production in the Soil and its Effect on Potato 



Scab . Learn (1) effect of various amounts and forms of inorganic 

 soil N on development of PotatoScab; (2) conditions influencing 

 accumulation of a high amount of ammonia nitrogen in soils. 

 Hort., Agron., Bact. 8-1 



N.Dak. The Nature of Virus Y Resistance in the Potato Selection 

 ND457-1 and Some of its Progenies . Learn what characteristics 

 are responsible for virus Y resistance. 



PI. Path., Hort., Ent. 12-6R (NC-35) Coop. ARS 



Pa. Breeding Disease-Resistant Varieties of Potatoes . To breed 



new varieties of potatoes resistant to disease, superior in 

 appearance and quality, and adapted to Pennsylvania environmental 

 conditions and market. 

 Bot. 755 Coop. ARS 



S. Dak. Potato Diseases and Their Control . To (l) develop a 



practical method of producing disease-free foundation stocks 

 in South Dakota; (2) devise effective practical method of 

 exterminating potato ring rot organism from storage and trans- 

 portation facilities, machinery, tools, etc.; (3) test effective- 

 ness of fungicides as seed treatments and foliage protectants 

 in potato disease control; and (4) locate sources of resistance 

 against important potato diseases in South Dakota, particularly 

 scab. 



PI. Path. 107 



Wash. Resistance of Potato Varieties and Seedlings to the Virus 



Leaf roll Diseas'eT To (1) test potato varieties and unnamed potato 

 seedlings for resistance to infection by leafroll virus under 

 field conditions; (2) study nature of leafroll resistance in order 

 to facilitate testing for resistance and breeding of resistant 

 varieties; and (3) test potato varieties and seedlings for develop- 

 ment of phloem necrosis in tubers following infection with leafroll 

 virus. 



PI. Path. 274 



