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Sweet Potatoes 



Ga. Improvement of Sweet Potato Varieties for Table Purposes 



Through Breeding , To obtain, through breeding or introduction, 

 sweet potato varieties which have superior yielding ability, 

 higher market and nutritive values, greater disease resistance 

 and better adaptability for specific uses than presently known 

 kinds. 



Hort. 89 



Ga. A Study of the Relationship of Insects tp the Transmission 



of a New Sweet Potato Mosaic Virus . Learn (1) if an insect is 

 the vector of the causative virus of sweet potato mosaic; (2) 

 if so, when it occurs on plantings and at what period trans- 

 mission occurs; (3) establish a control measure for the vector. 

 Ent. 221 Coop. ARS 



La. Breeding and Genetic Studies of the Sweet Potato . To (l) 



breed table type varieties that have the following desirable 

 characteristics: uniform shape, high yield, high sugar and 

 carotene content, storage ability, sprout production and cooking 

 qualities, ideal type for fresh market, as well as for canning, 

 etc.; (2) breed varieties and seedlings to be used as parents 

 that are resistant to these diseases and insects: Fusarium 

 wilt, soil rot, internal cork, nematodes, and weevil; (3) study 

 mode of inheritance of genetic characters and disease resistance; 

 and (A) breed varieties higher in starch and yielding ability 

 which could be used in making starch, feed, etc. 

 Hort. 527 Coop. ARS 



La. Breeding Sweet Potato Varieties for Internal Cork Resistance . 



Further test and evaluate existing parental lines for resistance 

 to internal cork. Collect and evaluate new lines which may be 

 resistant to disease. Study mode of inheritance of resistance to 

 internal cork. Evaluate new seedlings for commercial possibilities, 

 Maintain and distribute internal cork resistant material. 

 PI. Path., Hort. 866 



La. A Study of the Internal Cork Disease of Sweet Potatoes . To 



make basic studies of internal cork disease of sweet potatoes 

 necessary to permit eventual control of disease. 

 PI. Path., Hort. 867 



La. A Study of Insect Vectors of Internal Cork and of Foliage 



Feeding" Insects of Sweet Potato . Learn vector(s), responsible 

 for transmission of internal cork of sweet potato. Study biology 

 and ecology of vector to learn methods of attack for its control. 

 Develop control measures for vector. Learn effect of foliage 

 feeding insects on yield and quality. 

 Ent. 869 



