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N.Y. Investigations on the Effect of High-Humidity Cultural 

 (Cornell) Techniques on the Development of Diseases of Ornamental Plants . 

 Learn effects of using a high pressure fog system or an 

 intermittent mist system with propagation of cuttings and 

 growing of plants. 

 PI. Path. 189 



Ohio Diseases of Carnations (Dianthus Caryophyllus ) , Their 

 Control and Related Cultural Practices^ To (1) determine 

 relative susceptibility and resistance of carnation varieties 

 to (a) bacterial wilt and root rot caused by Phytomonas 

 caryophylli . (b) Fusarium wilt caused by Fusarium dianthi . 

 and (c) virus diseases (mosaic, streak, and yellows); and 

 (2) develop practical procedures for controlling these diseases 

 in the commercial production of carnations. 

 Bot., PI. Path., Hort. k9 



Oreg. Control of Mint Diseases , (l) By annual survey, learn 

 current extent and severity of Verticillium wilt; by field 

 test learn best practical rotation to nonsuscept crops, 

 practicability of chemical soil treatment for control, 

 effect of adding specific crop residues to soil on spread 

 and severity of wilt; by laboratory and greenhouse experiments 

 test promising soil chemical for wilt control and systemic 

 chemicals for control; (2) complete field testing of 

 nematocides having shown outstanding control in 2 years of 

 preliminary tests; (3) develop varieties of peperndnt and 

 spearmint resistant to rust and wilt-resistant varieties 

 developed by USDA. 



Bot., PI. Path. 120, Coop. ARS 



l£Ls_* Diseases of Ornamental Plants . Increase quality and 



marketability of greenhouse and of nursery ornamental plants 

 by prevention or control of plant diseases. 

 PI. Path. 981 



