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W. Va. Decay as a Factor in Sprout Reproduction of Yellow Poplar . 

 To determine prevalence and severity of decay as a factor in 

 sprout reproduction of yellow poplar, to learn the organisms 

 chiefly involved, their mode of entrance and rate and nature 

 of decay development, and as a result of this work, to be able 

 to recommend silvicultural treatments which will reduce to a 

 minimum the incidence of decay. 

 PI. Path., For. 14 



W. Va. Biology and Control of Tree-Wilt Pathogens , (l) Make 

 comparative physiological, morphological, and life history 

 studies of oak wilt pathogen and other fungi causing vascular 

 wilts of trees; (2) learn different methods of spread of oak 

 wilt and similar diseases and evaluate relative importance of 

 each method; (3) devise more effective and more practical 

 methods of control for wilt diseases using information obtained 

 under objectives 1 and 2. 



Pl.Path., Bact., Ent. 57 (NE-25) 



W. Va. The Cause and Control of "Hemlock Canker" . (l) Identify 

 pathogen or other cause of disease; (2) if disease is caused, 

 by a parasite organism, learn host-parasitic relationships 

 including conditions required for infection, disease develop- 

 ment, reproduction and dissemination of pathogen; (3) test 

 various control measures applicable to control of disease; 

 (4) learn distribution of disease in State. 

 PI. Path., Bact., Eht. 113 



Wis. The Spread and Control of Oak Wilt . To further the under- 



standing of the oak wilt disease, how the fungus operates, its 

 spread, and its control by continuing current investigations, 

 including (l) local spread — to clarify further tree-to- tree 

 spread in local areas, emphasizing role of root-grafting in 

 woodland stands of different age, composition, and density in 

 different sites, and at different times of the year, and to 

 determine significance of "adopted" root systems to maintenance 

 of disease "reservoirs", to disease spread, to survival and 

 growth rate in pure vs. mixed stands, to continuance of domi- 

 nance or suppression, and to certain practices; (2) local 

 control — to improve and extend methods of local control, 

 emphasizing use of improved chemicals and more efficient root 

 cutters under different circumstances; (3) long-distance spread — 

 to enc large studies on possible vectors of long-distance spread, 

 stressing role of woodpeckers and squirrels; and (U) host- 

 parasite relationships — to determine factors both in culture 

 and in the tree which influence the growth, viability, and 

 longevity of various fungus forms; to clarify further wilt 

 mechanisms and host response to fungus infection; and explain 

 variations in these responses. 

 PI. Path. 895 (NC-22) 



