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Control of Insects Transmitting Potato Viruses in 

 Colorado . Learn (l) what insecticides give best control of 

 aphids and leaf hoppers; (2) most effective and economical 

 rates of application; (3) if systemic insecticides will give 

 protection to the potatoes late in growing season when there 

 is a build up of aphid and leaf hopper population, 



Ent. 36 Coop. ARS 



Effect of Irradiating Russet Burbank Potatoes with Radio- 

 Active Fission Products upon Their Storage and Market Qualities, 

 Disease Prevention and Killing of Nematodes Contained Within the 

 Tubers » To learn (1) dosage of irradiation from fission products 

 that will inhibit sprouting of Russet Burbank tubers; (2) effect 

 of said treatment on taste, cooking and processing qualities, 

 flesh color and greening of skin under normal retail conditions; 

 (3) loss during storage due to rots, shrinkage, and sprouting 

 compared to non-treated tubers; (4) temperature that will allow 

 least moisture, sprout, and rot loss to treated tubers; (5) 

 how long marketing can be extended by use of treatment and still 

 receive consumer acceptance; (6) best time for using treatment 

 to expect best results; (7) possible effect of irradiation of tubers 

 in delaying expression of Verticillium wilt through modification 

 of dormancy; (8) if said dormancy can be broken by use of ethylene 

 or other chemicals; (9) if Ditylenchus destructor can be killed 

 by irradiation without injuring table quality. 



Hort. 268 Coop. AEC 



Control of Scab. Late Blight and Virus Diseases of Potato . 

 Learn value of combined resistance to potato scab, late blight, 

 and virus X. Reduce costs and increase efficiency of fungicidal 

 control of potato foliage diseases through use of late blight 

 resistance. Learn feasibility of producing virus-free seed 

 potato stocks. 



PI. Path., Agron. 8A0 



Potato Breeding * To (l) develop a potato variety with 

 good cooking and market quality, disease resistant, and adapted 

 to muck soils; (2) produce combinations of desirable characters 

 in strains of potatoes for use as parents in breeding program; 

 (3) study techniques and methods, and develop procedures for 

 screening and selecting superior lines in segregating progenies; 

 (A) maintain promising selections and parent cultures and to increase 

 these for distribution to an exchange with other stations cooper- 

 ating in the National Breeding Program; and (5) emphasize breeding 

 for disease resistance toscab, late blight, and certain virus 

 diseases. 



Hort., PI. Path. 118A 



