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Tex. Biological and Chemical Factors Influencing the Cotton 



Root Rot Fungus,. Phymatotrichum Omnivorum , By biochemical, 

 microbiological, and physical procedures' establish interrelations 

 between cotton root rot fungus and its environment, emphasizing: 

 (l) influence of chemical and physical factors operating in soil 

 on mycelial development and formation of sclerotia; (2) factors 

 involved in longevity and breaking of dormancy of sclerotia; 

 (3) evaluation of role of con-comitant soil microorganisms; 

 ik) effect of fungitoxic chemicals on growth and activity of 

 Phymatotrichum omnivorum ; (5) isolate and study compounds 

 secreted by root rot fungus; (6) development of improved 

 criteria for evaluating actual infestation status of disease 

 potential of field situations. 



PI. Physiol., PI. Path. 1102, Coop. ARS 



Flax 



N. Dak. Breeding and Genetics of Flax . To (l) develop varieties 



of flax vdth desirable agronomic qualities — high resistance to 

 wilt Fusarium lini ; resistance to races of rust; tolerance to 

 pasmo, Sphaerella linorum ; and quantity and quality of oil, 

 and seed yielding ability; and (2) determine if some relation- 

 ships exist between reaction to rust and other characters of 

 flax. 



PI. Path., Chem., Agron. 6-13, Coop. ARS 



N. Dak. Preservation of Certain Physiologic Races of Flax Rust 

 Melamspora Lini . To (l) preserve and maintain in uredinial 

 stage races of flax rust having desired genes for virulence 

 on selected flax varieties; and (2) test material for flax 

 breeders who desire such assistance, or furnish them on 

 request specific cultures for such testing. 

 Agron., PI. Path. 13-1 (NC-7) Coop. ARS 



Tex. Flax Improvement . To (l) develop or discover new varieties 



of flax better suited to Texas than now available, (2) search 

 for greater cold resistance among imported or domestic strains 

 and hybrid material, (3) cooperate in testing domestic and 

 imported strains for sources of disease resistance, cold 

 resistance and agronomic characteristics of value in the 

 program, {U) test rate and date of seeding, fertilizer needs 

 of crop and cultural methods for flax, (5) cooperate in 

 control tests of nematodes and insects which attack flax. 

 Agron., PI. Physiol., PI. Path. 1028, Coop. ARS 



