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La. Development of High Yielding Disease Resistant Potatoes 



for Louisiana Conditions , To breed varieties resistant to 

 early and late blight, rugose, and mild mosaic, to increase 

 yields and better quality of tubers, and help certified seed 

 industry, particularly in regard to export of Louisiana seed 

 potatoes. 



Hort. 395 Coop. ARS 



Maine Fungus Wilts of Potato Plants in Maine . To (l) determine 



relative importance of Verticillium albo - atrum . Fusarium spp., 

 Colletotrichum atramentarium . and other fungi as causes of 

 potato wilt; and (2) study Verticillium wilt with respect to 

 effect on yield rate and tuber quality; varietal resistance; 

 effect of soil type, soil treatments, fertilizer, and season on 

 percentage of incidence, symptoms, and yield reduction; 

 disinfection of implements and containers; development of 

 inspector's field test for presence of fungus; other hosts, 

 weed and crop; crop rotation; and relation to pink-eye and 

 red-xylem diseases. 



PI. Path. 6 Coop. ARS 



Maine Control of Potato Diseases by Chemicals . To discover 



and develop improved methods of control of potato diseases 

 with chemicals. 



PI. Path. 22 Coop. ARS 



Maine Breeding. Selecting, and Testing for Potato Disease Control . 



To (l) develop potato varieties with resistance in immunity to 

 X-virus, leafroll, ring rot, late blight, and scab; (2) develop 

 potato seed stocks that are free of X-virus, ring rot, etc., and 

 (3) test such resistant varieties and healthy seed stocks for 

 yielding capacity, tuber type, and cooking quality. 

 PI. Path., Ent. 27 Coop. ARS 



Maine The Development and Control of Potato Tuber Diseases and 



Discolorations During Storage and Handling . Learn (1) effect 

 of cultural practices andhandling methods on susceptibility of 

 tubers; (2) susceptibility of different varieties; (3) effect 

 of various storage conditions on rot development; (4) effect 

 of chemicals and other control measures applied during storage 

 and handling on rots and discoloration of tubers; (5) effect of 

 rot organisms and physiological discolorations on tissues of 

 tuber by histological methods. 



Bot., PI. Path. 117 Coop. AMS 



