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Minn. Cause and Control of Biological and Chemical Deterioration 

 of Agricultural Products in Storage. — IU t Lumber and Other 

 Wood Products . To determine prevalence and cause of discoloration 

 of aspen wood, and to devise methods of prevention and control. 

 PI. Path. & Bot. 2220-3 



Minn. Epidemiology of Oak Wilt , To (l) study factors affecting 

 formation and life span of mycelial mats; (2) investigate life 

 cycle of oak wilt fungus, particularly production of inoculum; 

 (3) find how this fungus can spread from tree to tree other than 

 by root grafts; and (4) develop control measures based primarily 

 on eliminating spores as a primary source of inoculum. 

 Pl.Path. & Bot. 2224 (NC-22) Coop. FS 



Mo. Investigations "on Oak Wilt . Study (l) distribution of 



disease in State; (2) plants affected and varietal suscepti- 

 bility; (3) morphology, physiology, and pathogenicity of 

 organism; (4) mode of infection, growth of fungus in suscept, 

 emergence of fungus from disease trees, dissemination, seasonal 

 development, influence of environmental factors; (5) movements 

 between hosts other than through root grafts, role of insects 

 and other vectors; (6) sanitation and/or isolation (effect on 

 local spread and effect on long distance spread), vector control, 

 resistance (selection and/or development of resistant varieties). 

 For. 52 (NC-22) Coop. FS 



Mo. Decay and Defect in Missouri Trees . To give foresters infor- 



mation on amount of decay commonly associated with* external tree 

 defects and on rapidity of spread of decay. 

 For. 75-F 



N. J. Symptoms, Spread, and Control of Canker Stain of Plane Trees . 



To gain on a regional basis and especially in New Jersey, information 

 concerning symptoms and rapid method of diagnosis, relationship of 

 borers to spread, life history of causal fungus, and means of control. 

 PI. Path., Ent. 481 (NE-25) 



N. Y. Antibiotics and Related Substances for Dutch Elm Disease 

 (Cornell) Control . Develop antibiotics or related materials for protecting 



elms against infection by the Dutch elm disease and to cure those 



infected. 



PI. Path., Bot. 187 (NE-25) 



