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Md. The Nature and Control of Sweet Potato Diseases Occurring 



in Maryland, Including Studies on Significance of Microbio- 

 logical Antagonism . To (1) develop better methods to control 

 diseases of economic importance; (2) undertake any studies 

 needed to better understand the cause and control of sweet 

 potato diseases; (3) study antagonistic effect of various 

 organisms in relation to pathogens affecting sweet potatoes; 

 (4) study use of antagonism as a commercial control of sweet 

 potato diseases; and (5) if promising antagonistic organisms 

 are found, to also study relation to other plant pathogens. 

 Bot., Hort. J-86-a Coop. ARS 



Miss. The Breeding and Evaluation of Sweet Potato Varieties 



and Selections for Yield, Quality, and Disease Resistance . 

 To find varieties of sweet potatoes which will produce higher 

 yields of better quality, more total food per acre, and that 

 will be better adapted for canning. 

 Hort. HK-13 Coop. ARS 



N. J. The Control of Certain Sweet Potato Diseases by Treatment 



of the Potatoes and Sprouts . To (l) study sprout treatments 

 for control of scurf and stem rot; (2) establish Actinomyces 

 ipomeae (pox) in ground beds for further study; and (3) test 

 boron as a possible control for sprout decay, and Fermate in 

 plant bed soil to control the disease. 

 PI. Path. 460 



N. J. Sweet Potato Storage Investigations . To determine effect 



of various temperatures and humidities during the curing period 

 on the incidence of several diseases affecting sweet potato 

 during storage period and to consider effect of environmental 

 factors occurring during holding period on keeping qualities 

 and of increasing Co 2 and 02 concentrations in storage house air. 

 PI. Path. 461 



N. C. Sweet Potato Breeding and Testing . To (l) develop varieties 



of sweet potatoes with improved quality, high productivity, 

 resistance to Fusarium wilt and internal cork, and desirable 

 storage and sprouting characteristics; (2) evaluate experimental 

 clonal lines and introduction for horticultural and processing 

 charzcteristics, and resistance to Fusarium wilt and internal 

 cork; (3) study factors affecting flowering and fruit setting 

 (seed production), and specific combining ability in breeding 

 stocks; and (4) investigate possibility of maintaining healthy 

 stocks to be used as foundation seed: a. maintenance of old 

 varieties, and b. maintenance aid releases of new varieties. 

 Hort. 86 Coop. ARS 



