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Ohio Pathological Aspects of the Oak Wilt Diseases . To (l) 

 determine, if possible, the existence of Chalara quercina 

 in fresh cut oak lumber, including white oak groups and red- 

 black group; (2) place logs and lumber under as many favorable 

 conditions for the growth of Chalara and determine how long 

 the fungus lives in cut logs and lumber; (3) determine whether 

 the saw or any type of cutting machinery spreads the oak wilt 

 fungus, and also whether the saw might carry the fungus into 

 lumber from healthy trees; (A) determine if there are any 

 methods by which lumber is piled that might keep the oak wilt 

 fungus alive and; (5) test a series of treatments if the oak 

 wilt fungus remains alive under any condition. 

 Bot. 96-1 (NC-22) 



Ohio A Study of Possible Vectors of the Oak Wilt Disease Organism . 

 To (l) ascertain the species of insects, if any, that are 

 attracted to Chalara mats ; (2) if suspected vectors are found, 

 determine if they carry the oak wilt organism either within or 

 upon their bodies; and (3) find if they can transmit the 

 organisms to healthy oaks. 

 Ent. 96-3 (NC-22) 



Pa. The Absorption and Translocation of Chemicals by Healthy 



and Oak Wilt-Disease Trees . (1) Compare ability of oak wilt- 

 infected and non-infected trees to absorb chemicals applied to 

 stumps and intact trunks, and to elucidate the factors involved 

 in absorption of these substances; (2) compare ability of infected 

 and non-infected trees to move and translocate foreign chemicals 

 within stumps, roots and stems, following application of these 

 substances. 



Bot. & PI. Path. 11A7-D (NE-25) 



R. I. Study of the Mechanism of Symptom Development and Chemo- 

 therapy of Wilt Diseases. Particularly the Dutch Elm Disease . 

 To (1) determine exoenzyme and hormone production by wilt 

 pathogens in culture; (2) determine effect of these metabolites 

 on host plants; and (3) evaluate chemicals which may serve as 

 internal medic ants. 

 PI. Path. 602 



R. I. Abnormal Physiology and Control of Vascular Wilt Diseases 

 of Trees . To learn (1; mechanisms of wilt induction by fungi 

 in trees, investigations of enzymatic auxin and toxin activity 

 in vivo and in vitro ; (2) how metabolic poise, carbohydrate 

 level, and air-moisture content of stem tissues may effect 

 severity of symptom development; (3) through field chemothera- 

 peutants (internal-acting medicants) selected by laboratory 

 bioassay. 



PI. Path., Ent., For. 611 (NE-25) Coop. FS 



