- 17 - 



N, Y, Investigations on the Effect of Hlgh-Humidlty Cultural 



(Cornell) Techniques on the Developanent of Diseases of Ornamental Plants , 

 Learn effects of using a high pressure fog system or an 

 intermiitent mist sy^stem vdth propagation of cuttings and grovdng 

 of plants, 



PI, Path, 189 



Ohio Diseases of Carnations (Pianthus Caryophyllus), Their Control 



and Related Cultural Practices , To (1) determine relative sus- 

 ceptibility and resistance of carnation varieties to (a) bacterial 

 wilt and root rot caused by Phytomonas caryophyll. (b) Fusarium 

 vdlt 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, A9 



Greg, Relation of Crop Residues to the Develoianent of Certain Root 



Rot Diseases of Nursery Crops , To learn (1) effect of certain 

 crop residues on development of root diseases of ornamental plants, 

 caused by Phytophthora cinnamon! and P, lateralis ; (2) influence 

 of soil temperature and moisture on effects of crop residues in 

 suppressing or stimulating disease development; (3) if isuppression 

 of disease associated with certain crop residues is biological, 

 chemical or physical, 



PI, Path. 196 (W-38-See ARS-23-8-17a) 



Pa, Survey and Post-Planting Chemical Control of Plant-Parasitic 



Nematodes in Pennsylvania , (1) Learn species of plant-parasitic 

 nematodes present in State; (2) establish range of various nematodes 

 in State; (3) learn extent in which nematodes are involved in plant 

 disease problems of State; (i*) seek chemicals which can be applied 

 to plants or soil as post- planting treatments, 



Bot., PI, Path, 1292 (NE-34-See ARS-23-8-17a.) 



R, I, Biology and Control of Nematodes Associated with Plant 



Diseases, with Ma.jor Emphasis on Ornamental and Forage Crops . 



(1) Learn role of nematodes as inciting agents of plant disease, 

 their relationships in plant disease complexes and their control; 



(2) improve nematocides as contact disinfectants and chemo- 

 therapeutants , 



PI, Path,, Ent, 610 (NE^34-See ARS-23-8-17a.) 



Wash, Symptoms and Effects of Fluoride Fumigation on Various 



Ornamental and Crop Plants^ To learn (1) and record photo- 

 graphically the sensitivity of forest, ornamental, vegetable, and 

 agronomic plants to small quantities of atmospheric fluoride; (2) 

 effects of exposure-period on plant response to small amounts of 

 atmospheric fluoride; (3) rate and extent of fluoride up-b\iild in 

 plants exposed to fluoride-contaminated air; (A) fluoride content 

 of forest, horticultural, and agronomic plants grown in Spokane 

 area; and (5) by terminal and/or radial growth studies if any conanon 

 fruit or ornamental tree species in Spokane area have been adversely 

 affected by fluoride from local industrial operations, 

 PI. Path. 1U3 (W-39-Se« ARS-23-8-ia) 



