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Idaho Nature of the Influence of Certain Crop Residues on the 

 Population and Pathogenicity of Onion Root and Bulb Rotting 

 Fungi » To learn if addition of crop residues to infested 

 soils suppresses activity of Pyrenochaeta terristris . Fusarium 

 oxysporum and Botrytis allii by: direct antibiosis to pathogens, 

 enhancing population of competitive saprophytes and of micro- 

 organisms antagonistic to these pathogens. 

 PI. Path. 300 (W-38) Coop. ARS 



La. Soil Borne Diseases of Forage and Cereal Crops in 



Louisiana . To learn factors, both pathological and 

 physiological, influencing growth of oats, lespedeza, 

 vetch, alfalfa, winter peas, etc. 

 PI. Path., Agron. 559 



Mi. Treatment of Soil and Underground Parts of Plants for the 



Control of Plant Diseases . To study the effects of soil treat- 

 ments with respect to: Cl) control of plant diseases and 

 phytotoxic effects on plants; (2) reaction of non-pathogens to 

 treatment and the interrelationship with disease pathogens and 

 plant growth; (3) methods and techniques for introducing treat- 

 ments into soil or plant; and (4) effects of treatment on soil 

 types. 



Bot. J-93 Coop. ARS 



Mont • Nature of the Influence of Crop Residues on Fungus-Induced 

 Root Diseases of Sugar Beets Caused by Aphanomyces Cochlioides 

 Drechs . (1) Evaluate chemical, physical, and biological 

 effects of crop residues and associated factors on development 

 or suppression of root rot of sugar beets caused by Aphanomyces 

 cochlioides ; (2) study influence of soil temperature, moisture, 

 and aeration on effects of residues in developing or suppressing 

 root rot of sugar beets. 



Bot. & Bact. MS 981 (W-38) 



Nebr. Fundamental Studies on Root Diseases of Plants . To 



determine (1) factors affecting survival of organisms which 

 cause root "diseases while in the soil; and (2) factors 

 inciting soil organisms to become parasitic on roots of plants. 

 PI. Path. 398 



