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Nye Cre Irish Potato Breeding. To (1) 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; and 
(3) study inheritance of &- resistance to scab, and to southern 
bacterial wilt, b. tuber color, and c. time of maturity. 
Hort. 81 Coop. ARS 
N.C. investigations on the Field Diseases of Sweet Potatoes. 
To (1) investigate the role of nematodes in sweet potato 
production and use of nematocides for their control, 
(2) survey horticultural and agronomic crops for strains of 
Fusarium oxysporium that are infectious to sweet potato, 
(3) establish value of vine cuttings in controlling black 
rot and scurf of sweet potatoes, and role of soil organic 
matter on longevity of the respective pathogens, 
Endocomidiophora fimbriata and Monilochaetes infuscans, 
(i) investigate mode of transmission, host range, diagnosis 
and physiology of internal cork disease and other viruses, 
and (5) study life cycle and economic importance of 
Fusarium surface rot. 
Pl. Path. 91 
N. Dake Rates and Methods of Applications of Insecticides to 
Potatoes. To (1) determine advisability of installing low 
pressure and low gallonage equipment on high pressure 
sprayers and transforming existing equipment into dual 
purpose sprayers; (2) determine controversial issue on 
3% vse 5% DDT dusts on larger plots; (3) continue search for 
residual aphicide; and (4) determine if newer and cheaper 
75% DDI wettable powders can supplant emulsifiable 
concentrates. 
Ente, Pare Pathe 5-1 
Ohio Evaluating Insect Resistance in Varieties and Strains 
of Potato. To (1) study behavior of potato pests (with 
major emphasis on potato leafhopper and potato flea beetle, 
and secondary consideration on potato aphids, Colorado 
potato beetle, blister beetles, and tarnished potato bugs), 
with special reference to strains; and (2) develop a variety 
or varieties of potato which combine insect resistance with 
desirable horticultural qualities. 
Ente 23 Coop. ARS 
